NEWSLETTER 09/2022 10.09.2022

Please acknowledge use of the database www.shark-references.com in your publications, and cite: 

Pollerspöck, J. & Straube, N. 2022, Bibliography database of living/fossil sharks, rays and chimaeras (Chondrichthyes: Elasmobranchii, Holocephali), www.shark-references.com, World Wide Web electronic publication, Version 2022

New open access paper co-authored by team shark-references!

Feichtinger, I. & Guinot, G. & Straube, N. & Harzhauser, M. & Auer, G. & Ćorić, S. & Kranner, M. & Schellhorn, S. & Ladwig, J. & Thies, D. & Pollerspöck, J. 2022 Revision of the Cretaceous shark Protoxynotus (Chondrichthyes, Squaliformes) and early evolution of somniosid sharks. Cretaceous Research, in press

Due to the peculiar combination of dental features characteristic for different squaliform families, the position of the Late Cretaceous genera Protoxynotus and Paraphorosoides within squaliform families has long been controversial. In this study, we revise these genera based on previously known fossil teeth and new dental material. The phylogenetic placement of Protoxynotus and Paraphorosoides among other extant and extinct squaliforms is discussed based on morphological characters combined with DNA sequence data for extant species. Our results suggest that Protoxynotus and Paraphorosoides should be included in the Somniosidae and that Paraphorosoides is a junior synonym of Protoxynotus. New dental material from the Campanian of Germany and the Maastrichtian of Austria enabled the description of a new species Protoxynotus mayrmelnhofi sp. nov. In addition, the evolution and origin of the characteristic squaliform tooth morphology are discussed, indicating that the elongated lower jaw teeth with erected cusp and distinct dignathic heterodonty of Protoxynotus represents a novel functional adaptation in its cutting-clutching type dentition among early squaliform sharks. Furthermore, the depositional environment of the tooth bearing horizons allows for an interpretation of the preferred habitat of this extinct dogfish shark, which exclusively occupied shelf environments of the Boreal- and northern Tethyan realms during the Late Cretaceous.

New open access paper co-authored by Dr. Straube, team shark-references!

Villate-Moreno M, Cubillos-M JC, Stibor H, Crawford AJ, Straube N.
Molecular identification and first demographic insights of sharks based on artisanal fisheries bycatch in the Pacific Coast of Colombia: implications for conservation. PeerJ 10:e13478 https://doi.org/10.7717/peerj.13478

The Pacific coast of Colombia is characterized by mangrove ecosystems which play a crucial role as possible nurseries for juvenile sharks. However, trophic food webs from coastal ecosystems are heavily disturbed by increased fishing pressure, which affects numerous shark species. In this region of the Eastern Tropical Pacific (ETP), fisheries’ data from coastal areas are scarce and unspecific, as most sharks from artisanal fisheries are landed decapitated and finless, making their morphological identification difficult. For the establishment and implementation of effective regional conservation and management policies, information on the diversity and population dynamics of shark species is crucial. We therefore sequenced the mitochondrial NADH2 gene of 696 samples taken from fishermen’s landings of shark’s bycatch along the Colombian north Pacific coast. We were able to identify 14 species of sharks, two of the most abundant species were Sphyrna lewini and Carcharhinus falciformis, both evaluated on IUCN the Red List of Threatened species (Critically Endangered and Vulnerable) and CITES regulated. We found low genetic diversity in the sampled area increasing the concern for both species in the region, even more considering that the majority of individuals were juveniles. Our results showed the importance of genetic markers for first population genetic insights as a complementary tool during the decision-making process in management plans. For this specific region, strategies such as the delimitation of conservation priority areas or the regulation of fishing gears could help improve the sustainability of shark populations in the Colombian Pacific.



We started to change our old (and unique!) citation style to adapt to the APA citation style (for information please see: https://www.mendeley.com/guides/apa-citation-guide) to make the usage of references listed in shark references easier and more compatible with a widely accepted reference style adopted by several international scientific journals. The transition is ongoing, so far 24847 (last month: 24783) references are changed.



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NEW SECTION: From now on, we will report last month’s most popular three papers from our Shark References Facebook page:

If you would like us to post information about your newly published work, please send us a picture and the paper as a pdf to nicolas.straube@shark-references.com or juergen.pollerspoeck@shark-references.com.

Nr. 1 (150 Likes/Emojis, 117 Shares):

Cooper, J.A. & Hutchinson, J.R. & Bernvi, D.C. & Cliff, G. & Wilson, R.P. & Dicken, M.L. & Menzel, J. & Wroe, S. & Pirlo, J. & Pimiento, C. 2022
The extinct shark Otodus megalodon was a transoceanic superpredator: Inferences from 3D modeling.
Science Advances, 8(33), Article eabm9424

Although shark teeth are abundant in the fossil record, their bodies are rarely preserved. Thus, our understanding of the anatomy of the extinct Otodus megalodon remains rudimentary. We used an exceptionally well-preserved fossil to create the first three-dimensional model of the body of this giant shark and used it to infer its movement and feeding ecology. We estimate that an adult O. megalodon could cruise at faster absolute speeds than any shark species today and fully consume prey the size of modern apex predators. A dietary preference for large prey potentially enabled O. megalodon to minimize competition and provided a constant source of energy to fuel prolonged migrations without further feeding. Together, our results suggest that O. megalodon played an important ecological role as a transoceanic superpredator. Hence, its extinction likely had large impacts on global nutrient transfer and trophic food webs.

Nr. 2 (103 Likes/Emojis, 59 Shares):

Barone, M., Mazzoldi, C., Serena, F. 2022.
Sharks, rays and chimaeras in Mediterranean and Black Seas – Key to identification. Rome, FAO.

This guide contains the illustrated key to orders, families, genera and species to the Chondrichthyes of the Mediterranean and Black Seas (FAO fishing area 37), currently represented by 38 sharks, 48 batoids and 2 chimaeras. The species are described following the taxonomic order and are grouped in functional groups. Near the illustration of each species, the relevant diagnostic features are complemented by a set of icons representing the management measures and the data collection requirements as per existing GFCM recommendations. The technical terms and the minimum standard measurements are provided as annexes.

Nr. 3 (49 Likes/Emojis, 8 Shares):

Ćetković, I. & Jambura, P.L. & Pešić, A. & Ikica, Z. & Joksimović, A. 2022
Observations of juvenile sandbar sharks Carcharhinus plumbeus (Nardo, 1827) around the Bojana River delta (Southern Adriatic Sea).
Mediterranean Marine Science, 23(4), 748–753

The sandbar shark (Carcharhinus plumbeus) is considered rare in the Adriatic Sea and the majority of records originate from the northern Adriatic, where a nursery area for this species close to the Po delta system has been repeatedly proposed. This study provides 5 new records and analyses the previously published records of sandbar sharks recorded around the delta of the River Bojana (in Montenegro, in the south-eastern Adriatic). The River Bojana located on the border between Montenegro and Albania, is the second largest river flowing into the Adriatic Sea, where it forms a highly productive ecosystem already known as a local hotspot for smooth-hound sharks (Mustelus spp.). New records of sandbar sharks have emerged as a result of citizen science (a social media survey) and direct reports from fishermen. The total length of C. plumbeus juveniles ranged from approximately 800 mm to 1100 mm, and most (n=5) were caught by set gillnets. The data presented here show that juveniles are consistently present around the estuary and indicate the importance of this fragile estuarine ecosystem for sandbar sharks. Additionally, this study also provides morphometric data collected from a single individual.


New Images

Many thanks to the following people for providing images:

Frederik Mollen, Elasmobranch Research, Belgium for images of Fontitrygon margarita (Günther, 1870)

Jesco Seifert,  for images of
Centrophorus uyato (Rafinesque, 1810)
Centrophorus squamosus (Bonnaterre, 1788)
Centrophorus lusitanicus Barbosa du Bocage & de Brito Capello, 1864
Pristiophorus nancyae Ebert & Cailliet, 2011
Carcharhinus tjutjot (Bleeker, 1852)

Fabrizio Serena, CNR IRBIM, National Research Council – Institute of Marine Biological Resources and Biotechnologies, Italy for a image of Rostroraja alba (Lacépède, 1803)


Missing papers:

Many thanks to all friends of shark-references, who sent us some missing papers last month!

Shark-References would kindly like to ask you for your contribution to this project.

At the moment we are looking for some of the following papers:

Extinct Chondrichthyes:

Numano, M. (1993) Some Neogene shark-teeth from Mogami area, Yamagata Prefecture. Applied Geology of Yamagata, 13: 32–49

Extant Chondrichthyes:

Marini, T.L.  (1935) Nota sobre una raya argentina. Physis, 11(40): 503–506

SMITH, J.L.B. (1958) The mystery killer, the new shark Carcharhinus vanrooyeni. Veld & Vlei, 3 (9): 12–14, 28.

GUBANOV, E.P. & SCHLEIB, N.A. (1980) Sharks of the Arabian Gulf. Kuwait Ministry of Public Works, Agracultural Department, Fisheries Division. Sharks of the Arabian Gulf.: 1–69

DOLGANOV, V.N. (1983) Rukovodstvo po opredeleniyu khryashchevykh ryb dal'nevostochnykh morei SSSR i sopredel'nykh vod. [Manual for identification of cartilaginous fishes of Far East seas of USSR and adjacent waters.] TINRO, Vladivostok. Rukovodstvo po opredeleniyu khryashchevykh ryb dal'nevostochnykh morei SSSR i sopredel'nykh vod.: 92 pp.

Please support www.shark-references.com and send missing papers (not listed papers or papers without the info-symbol) to juergen.pollerspoeck@shark-references.com or nicolas.straube@shark-references.com



Upcoming Meetings:


Sharks International Conference 2022 (SI2022)
October 10 – 14, 2022 (online virtual conference)
October 20 – 22, 2022 (physical in-person conference)
Valencia, Spain
SI2022 is a hybrid event in October 2022 that will bring together a strong community of people from across the world interested in sharks and rays, all in the name of addressing the challenge of elasmobranch conservation in this Decade of Ocean Science. In association with the European Elasmobranch Association (EEA) and hosted by the Shark Trust, Submon, and Lamna, the event will include five online days (October 10- 14th) featuring enhanced digital content on key themes in shark conservation, leading up to a three-day physical conference in Valencia (October 20th-22nd). The conference is funded by the Save our Seas Foundation and will be based out of L’Oceanogràfic, the largest aquarium in Europe, and streamed live across the world. If you are interested in sharks and rays and want to be a part of the 300+ member community currently shaping SI2022, sign up to the portal at si2022.org. Join this year to be automatically entitled to a 10% discount when tickets become available.




Extant Chondrichthyes:
no taxonomic news this month

Extinct Chondrichthyes:

Feichtinger, I. & Guinot, G. & Straube, N. & Harzhauser, M. & Auer, G. & Ćorić, S. & Kranner, M. & Schellhorn, S. & Ladwig, J. & Thies, D. & Pollerspöck, J. (2022): Revision of the Cretaceous shark Protoxynotus (Chondrichthyes, Squaliformes) and early evolution of somniosid sharks. Cretaceous Research, 140, Article 105331
New species: Protoxynotus mayrmelnhofi
Abstract: Due to the peculiar combination of dental features characteristic for different squaliform families, the position of the Late Cretaceous genera Protoxynotus and Paraphorosoides within Squaliformes has long been controversial. In this study, we revise these genera based on previously known fossil teeth and new dental material. The phylogenetic placement of Protoxynotus and Paraphorosoides among other extant and extinct squaliforms is discussed based on morphological characters combined with DNA sequence data of extant species. Our results suggest that Protoxynotus and Paraphorosoides should be included in the Somniosidae and that Paraphorosoides is a junior synonym of Protoxynotus. New dental material from the Campanian of Germany and the Maastrichtian of Austria enabled the description of a new species Protoxynotus mayrmelnhofi sp. nov. In addition, the evolution and origin of the characteristic squaliform tooth morphology are discussed, indicating that the elongated lower jaw teeth with erected cusp and distinct dignathic heterodonty of Protoxynotus represents a novel functional adaptation in its cutting-clutching type dentition among early squaliform sharks. Furthermore, the depositional environment of the tooth bearing horizons allows for an interpretation of the preferred habitat of this extinct dogfish shark, which exclusively occupied shelf environments of the Boreal- and northern Tethyan realms during the Late Cretaceous.

Ruhnke, T.R. & Pommelle, C.P. & Aguilar, D. & Hudson, H. & Reyda, F.B. (2022): Two New Species of Stillabothrium (Cestoda: Rhinebothriidea) from Stingrays from Northern Australia and One New Combination. Journal of Parasitology, 108(2), 166–179
New species: Stillabothrium lunae, Stillabothrium mariae
Abstract: A study of cestode specimens that were collected during survey work on elasmobranchs collected from Taiwan and Northern Territory, Australia, revealed the presence of 1 new combination into the genus Stillabothrium (Rhinebothriidea: Escherbothriidae) and 2 new species of the genus. Phyllobothrium biacetabulatum, collected from Rhinobatos schlegelii, is transferred to Stillabothrium and its description is emended, as is the diagnosis for the genus Stillabothrium and the family Escherbothriidae. Stillabothrium biacetabulatum n. comb. differs from existing species of the genus in that the face of its bothridia is laced with a network of longitudinal and horizontal muscle fibers that do not contribute to the formation of septa. Stillabothrium lunae n. sp. is described from Himantura leoparda and differs from existing species of the genus in that its bothridium possesses an anterior field of 7–8 loculi that are wider than long. Stillabothrium mariae n. sp. is described from Maculabatis astra. This species differs from all species of Stillabothrium except Stillabothrium campbelli in possessing 10–12 horizontally oriented bothridial loculi. Stillabothrium mariae n. sp. differs from S. campbelli in having longer bothridia and from all other species of Stillabothrium in that it lacks, rather than possesses, conspicuous septa and loculi that are longer than wide in the posterior region of its bothridia. Bayesian and parsimony-bootstrap analysis of 28S rDNA revealed S. biacetabulatum n. comb., S. lunae n. sp., and S. mariae n. sp. to be part of Clade 1 of Stillabothrium, with S. biacetabulatum n. comb. being the sister species to S. mariae n. sp. Stillabothrium lunae n. sp. was found to be the sister species to Stillabothrium borneoense.
Boxshall, G.A. & Barton, D.P. & Kirke, A. & Zhu, X.C. & Johnson, G. (2022): Two new parasitic copepods of the family Sphyriidae (Copepoda: Siphonostomatoida) from Australian elasmobranchs. Systematic Parasitology, in press
New species: Tripaphylus squidwardi, Tripaphylus dippenaarae
Abstract: Two new species of the genus Tripaphylus Richiardi in Anonymous, 1878 (family Sphyriidae) are described from elasmobranch hosts caught as bycatch within the Demersal and Timor Reef Fisheries which operate in the Northern Territory exclusive economic zone. Tripaphylus squidwardi n. sp. was collected from Carcharhinus coatesi Whitley and had a prevalence of 11.6%. Tripaphylus dippenaarae n. sp. was collected from Rhizoprionodon acutus (Rüppell) and had a prevalence of 28.2%. The new species are distinguished from existing congeneric species by the body proportions and shape of the adult female and by the arrangement of lobes on the ventral surface of the cephalothorax.


PLEASE send your new papers to
juergen.pollerspoeck@shark-references.com or 

Latest Research Articles

Extant Chondrichthyes:
Aburatani, N. & Takagi, W. & Wong, M.K.S. & Kuraku, S. & Tanegashima, C. & Kadota, M. & Saito, K. & Godo, W. & Sakamoto, T. & Hyodo, S. (2022): Molecular and morphological investigations on the renal mechanisms enabling euryhalinity of red stingray Hemitrygon akajei. Frontiers in Physiology, 13, Article 953665 https://dx.doi.org/10.3389/fphys.2022.953665
Anderson, T. & Meese, E.N. & Drymon, J.M. & Stunz, G.W. & Falterman, B. & Menjivar, E. & Wells, R.J.D. (2022): Diel Vertical Habitat Use Observations of a Scalloped Hammerhead and a Bigeye Thresher in the Northern Gulf of Mexico. Fishes, 7(4), Article 148 https://dx.doi.org/10.3390/fishes7040148
Andrzejaczek, S. & Lucas, T.C.D. & Goodman, M.C. & Hussey, N.E. & Armstrong, A.J. & Carlisle, A. & Coffey, D.M. & Gleiss, A.C. & Huveneers, C. & Jacoby, D.M.P. & Meekan, M.G. & Mourier, J. & Peel, L.R. & Abrantes, K. & Afonso, A.S. & Ajemian, M.J. & Anderson, B.N. & Anderson, S.D. & Araujo, G. & Armstrong, A.O. & Bach, P. & Barnett, A. & Bennett, M.B. & Bezerra, N.A. & Bonfil, R. & Boustany, A.M. & Bowlby, H.D. & Branco, I. & Braun, C.D. & Brooks, E.J. & Brown, J. & Burke, P.J. & Butcher, P. & Castleton, M. & Chapple, T.K. & Chateau, O. & Clarke, M. & Coelho, R. & Cortes, E. & Couturier, L.I.E. & Cowley, P.D. & Croll, D.A. & Cuevas, J.M. & Curtis, T.H. & Dagorn, L. & Dale, J.J. & Daly, R. & Dewar, H. & Doherty, P.D. & Domingo, A. & Dove, A.D.M. & Drew, M. & Dudgeon, C.L. & Duffy, C.A.J. & Elliott, R.G. & Ellis, J.R. & Erdmann, M.V. & Farrugia, T.J. & Ferreira, L.C. & Ferretti, F. & Filmalter, J.D. & Finucci, B. & Fischer, C. & Fitzpatrick, R. & Forget, F. & Forsberg, K. & Francis, M.P. & Franks, B.R. & Gallagher, A.J. & Galvan-Magana, F. & García, M.L. & Gaston, T.F. & Gillanders, B.M. & Gollock, M.J. & Green, J.R. & Green, S. & Griffiths, C.A. & Hammerschlag, N. & Hasan, A. & Hawkes, L.A. & Hazin, F. & Heard, M. & Hearn, A. & Hedges, K.J. & Henderson, S.M. & Holdsworth, J. & Holland, K.N. & Howey, L.A. & Hueter, R.E. & Humphries, N.E. & Hutchinson, M. & Jaine, F.R.A. & Jorgensen, S.J. & Kanive, P.E. & Labaja, J. & Lana, F.O. & Lassauce, H. & Lipscombe, R.S. & Llewellyn, F. & Macena, B.C.L. & Mambrasar, R. & McAllister, J.D. & McCully Phillips, S.R. & McGregor, F. & McMillan, M.N. & McNaughton, L.M. & Mendonça, S.A. & Meyer, C.G. & Meyers, M. & Mohan, J.A. & Montgomery, J.C. & Mucientes, G. & Musyl, M.K. & Nasby-Lucas, N. & Natanson, L.J. & O’Sullivan, J.B. & Oliveira, P. & Papastamtiou, Y.P. & Patterson, T.A. & Pierce, S.J. & Queiroz, N. & Radford, C.A. & Richardson, A.J. & Richardson, A. & Righton, D. & Rohner, C.A. & Royer, M.A. & Saunders, R.A. & Schaber, M. & Schallert, R.J. & Scholl, M.C. & Seitz, A.C. & Semmens, J.M. & Setyawan, E. & Shea, B.D. & Shidqi, R.A. & Shillinger, G.L. & Shipley, O.N. & Shivji, M.S. & Sianipar, A.B. & Silva, J.F. & Sims, D.W. & Skomal, G.B. & Sousa, L.L. & Southall, E.J. & Spaet, J.L.Y. & Stehfest, K.M. & Stevens, G. & Stewart, J.D. & Sulikowski, J.A. & Syakurachman, I. & Thorrold, S.R. & Thums, M. & Tickler, D. & Tolloti, M.T. & Townsend, K.A. & Travassos, P. & Tyminski, J.P. & Vaudo, J.J. & Veras, D. & Wantiez, L. & Weber, S.B. & Wells, R.J.D. & Weng, K.C. & Wetherbee, B.M. & Williamson, J.E. & Witt, M.J. & Wright, S. & Zilliacus, K. & Block, B.A. & Curnick, D.J. (2022): Diving into the vertical dimension of elasmobranch movement ecology. Science Advances, 8(33), Article eabo1754 https://dx.doi.org/10.1126/sciadv.abo1754
Annona, G. & Sato, I. & Pascual-Anaya, J. & Osca, D. & Braasch, I. & Voss, R. & Stundl, J. & Soukup, V. & Ferrara, A. & Fontenot, Q. & Kuratani, S. & Postlethwait, J.H. & D'Aniello, S. (2022): Evolution of the nitric oxide synthase family in vertebrates and novel insights in gill development. Proceedings of the Royal Society B-Biological Sciences, 289(1980), Article 20220667 https://dx.doi.org/10.1098/rspb.2022.0667
Barone, M. & Mazzoldi, C. & Serena, F, (2022): Sharks, rays and chimaeras in Mediterranean and Black Seas – Key to identification. Rome, FAO, 96pp https://dx.doi.org/10.4060/cc0830en
Beal, A.P. & Hackerott, S. & Feldheim, K. & Gruber, S.H. & Eirin-Lopez, J.M. (2022): Age group DNA methylation differences in lemon sharks (Negaprion brevirostris): Implications for future age estimation tools. Ecology and Evolution, 12(8), Article e9226 https://dx.doi.org/10.1002/ece3.9226
Berio, f. & Bayle, Y. & Baum, D. & Goudemand, N. & Debiais-Thibaud, M. (2022): Hide and seek shark teeth in Random Forests: machine learning applied to Scyliorhinus canicula populations. PeerJ, 10, Article e13575 https://dx.doi.org/10.7717/peerj.13575
Booth, H. & Powell, G. & Yulianto, I. & Simeon, B. & Muhsin, Adrianto, L. & Milner-Gulland, E.J. (2022): Exploring cost-effective management measures for reducing risks to threatened sharks in a problematic longline fishery. Ocean & Coastal Management, 225, Article 106197  https://dx.doi.org/10.1016/j.ocecoaman.2022.106197
Branham, C.C. & Frazier, B.S. & Strange, J.B. & Galloway, A.S. & Adams, D.H. & Drymon, J.M. & Grubbs, R.D. & Portnoy, D.S. & Wells, R.J.D. & Sancho, G. (2022): Diet of the bonnethead (Sphyrna tiburo) along the northern Gulf of Mexico and southeastern Atlantic coast of the United States. Animal Biodiversity and Conservation, 45(2), 257–267 https://dx.doi.org/10.32800/abc.2022.45.0257
Briones-Mendoza, J. & Mejia, D. & Carrasco-Puig, P. (2022): Catch Composition, Seasonality, and Biological Aspects of Sharks Caught in the Ecuadorian Pacific. Diversity, 14(8), Article 599 https://dx.doi.org/10.3390/d14080599
Ćetković, I. & Jambura, P.L. & Pešić, A. & Ikica, Z. & Joksimović, A. (2022): Observations of juvenile sandbar sharks Carcharhinus plumbeus (Nardo, 1827) around the Bojana River delta (Southern Adriatic Sea). Mediterranean Marine Science, 23(4), 748–753 https://dx.doi.org/10.12681/mms.30166
Cheung, W.W.L. & Wei, C.L. & Levin, L.A. (2022): Vulnerability of exploited deep-sea demersal species to ocean warming, deoxygenation, and acidification. Environmental Biology of Fishes, in press https://dx.doi.org/10.1007/s10641-022-01321-w
Chevis, M.G. & Graham, R.T. (2022): Insights into elasmobranch composition, abundance, and distribution in the Bocas del Toro Archipelago, Panama using fisheries-independent monitoring. Latin American Journal of Aquatic Research, 50(3), 492–506 https://dx.doi.org/10.3856/vol50-issue3-fulltext-2890
Correa, B. & Paiva, L.G. & Santos-Neto, E. & Vidal, L.G. & Azevedo-Silva, C.E. & Vianna, M. & Lailson-Brito, J.L. (2022): Organochlorine contaminants in Rio skate (Rioraja agassizii), an endangered batoid species, from southeastern coast of Brazil. Marine Pollution Bulletin, 182, Article 114002  https://dx.doi.org/10.1016/j.marpolbul.2022.114002
Costa, F. & Mieiro, C.L. & Pereira, M.E. & Coelho, J.P. (2022): Mercury bioaccessibility in fish and seafood: Effect of method, cooking and trophic level on consumption risk assessment. Marine Pollution Bulletin, 179, Article 113736  https://dx.doi.org/10.1016/j.marpolbul.2022.113736
De Barros, M.S.F. & De Oliveira, C.D.L. & Batista, V.D. (2022): Is restricting catch to young sharks only more sustainable? Exploring a controversial management strategy for bull, tiger, blue and bonnethead sharks. Fisheries Management and Ecology, in press https://dx.doi.org/10.1111/fme.12593
de la Fuente, S.E.O. & Rodriguez-Castro, J.H. & Ramirez-de Leon, J.A. & Caballero-Rico, F.C. & Rodriguez-Olmeda, J.A. & Toledano-Toledano, F. (2022): Modeling the Individual Growth of the Bonnethead Shark Sphyrna tiburo of the Western Gulf of Mexico Using the Multimodel Approach. Fishes, 7(4), Article 157 https://dx.doi.org/10.3390/fishes7040157
Di Lorenzo, M. & Calo, A. & Di Franco, A. & Milisenda, G. & Aglieri, G. & Cattano, C. & Milazzo, M. & Guidetti, P. (2022): Small-scale fisheries catch more threatened elasmobranchs inside partially protected areas than in unprotected areas. Nature Communications, 13(1), Article 4381 https://dx.doi.org/10.1038/s41467-022-32035-3
Domingues, R.R. & Mastrochirico, V.A. & Mendes, N.J. & Hashimoto, D.T. & Coelho, R. & Antunes, A. & Foresti, F. & Mendonca, F.F. (2022): Gene-associated markers as a genomic and transcriptomic resource for a highly migratory and apex predator shark (Isurus oxyrinchus). Marine Biology, 169(9), Article 109 https://dx.doi.org/10.1007/s00227-022-04094-z
Feldheim, K.A. & Wyffels, J.T. & Lyons, K. (2022): The role of aquaria in the advancement of elasmobranch reproductive biology. Frontiers in Marine Science, 9, Article 963542 https://dx.doi.org/10.3389/fmars.2022.963542
Fonseca-Ponce, IA. & Zavala-Jiménez, A.A. & Aburto-Oropeza, O. & Maldonado-Gasca, A. & Galván-Magaña, F. & González-Armas, R. & Stewart, J.D. (2022): Physical and environmental drivers of oceanic manta ray Mobula birostris sightings at an aggregation site in Bahía de Banderas, Mexico. Marine Ecology Progress Series, 694, 133–148 https://dx.doi.org/10.3354/meps14106
Fraser, G.J. & Smith, M.M. (2022): Evolution of developmental pattern for vertebrate dentitions: an oro-pharyngeal specific mechanism. Journal of Experimental Zoology Part B, Molecular and Developmental Evolution, 316B(2), 99–112 https://dx.doi.org/10.1002/jez.b.21387
Gennari, E. & Irion, D.T. & Cowley, P.D. (2022): Active acoustic telemetry reveals ontogenetic habitat-related variations in the coastal movement ecology of the white shark. Animal Biotelemetry, 10(1), Article 25 https://dx.doi.org/10.1186/s40317-022-00295-x
Giovos, I. & Aga-Spyridopoulou, R.N. & Serena, F. & Soldo, A. & Barash, A. & Doumpas, N. & Gkafas, G.A. & Katsada, D. & Katselis, G. & Kleitou, P. & Minasidis, V. & Papastamatiou, Y.P. & Touloupaki, E. & Moutopoulos, D.K. (2022): An Updated Greek National Checklist of Chondrichthyans. Fishes, 7(4), Article 199 https://dx.doi.org/10.3390/fishes7040199
Guy-Haim, T. & Stern, N. & Sisma-Ventura, G. (2022): Trophic Ecology of Deep-Sea Megafauna in the Ultra-Oligotrophic Southeastern Mediterranean Sea. Frontiers in Marine Science, 9, Article 857179 https://dx.doi.org/10.3389/fmars.2022.857179
Hamilton, B.R. & Shipley, O.N. & Grubbs, D. (2022): Multi-channel feeding by migratory sharks in a fluvial-dominated estuary. Estuarine Coastal and Shelf Science, 275, Article 107977 https://dx.doi.org/10.1016/j.ecss.2022.107977
Henderson, A.C. & Smith, C. & Bruns, S. (2022): Fussy eaters, bait loss and escapees: How reliable are baited-hook assessments of shark abundance in shallow, coastal waters?. Journal of Experimental Marine Biology and Ecology, 556, Article 151794 https://dx.doi.org/10.1016/j.jembe.2022.151794
Herr, H. & Viquerat, S. & Naujocks, T. & Gregory, B. & Lees, A. & Devas, F. (2022): Skin condition of fin whales at Antarctic feeding grounds reveals little evidence for anthropogenic impacts and high prevalence of cookiecutter shark bite lesions. Marine Mammal Science, in press https://dx.doi.org/10.1111/mms.12966
Hoban, M.L. & Whitney, J. & Collins, A.G. & Meyer, C. & Murphy, K.R. & Reft, A.J. & Bemis, K.E. (2022): Skimming for barcodes: rapid production of mitochondrial genome and nuclear ribosomal repeat reference markers through shallow shotgun sequencing. Peerj, 10, Article e13790 https://dx.doi.org/10.7717/peerj.13790
Hoenicka, M.A.K. & Andreotti, S. & Carvajal-Chitty, H. & Matthee, C.A. (2022): The role of controlled human-animal interactions in changing the negative perceptions towards white sharks, in a sample of White Shark cage diving tours participants. Marine Policy, 143, Article 105130 https://dx.doi.org/10.1016/j.marpol.2022.105130
Julio, T.G. & Moura, V.L. & Lacerda, L.D. & Lessa, R.P.T. (2022): Mercury concentrations in coastal Elasmobranchs (Hypanus guttatus and Rhizoprionodon porosus) and human exposure in Pernambuco, Northeastern Brazil. Anais Da Academia Brasileira De Ciencias, 94, Article e20220045  https://dx.doi.org/10.1590/0001-3765202220220045
Kindong, R. & Sarr, O. & Wu, F. & Tian, S.Q. (2022): Length-Based Assessment Methods for the Conservation of a Pelagic Shark, Carcharhinus falciformis from the Tropical Pacific Ocean. Fishes, 7(4), Article 184 https://dx.doi.org/10.3390/fishes7040184
Kumar, G. & Reaume, A.M. & Farrell, E. & Gaither, M.R. (2022): Comparing eDNA metabarcoding primers for assessing fish communities in a biodiverse estuary. Plos One, 17(6), Article e0266720 https://dx.doi.org/10.1371/journal.pone.0266720
Le Croizier, G. & Sonke, J.E. & Lorrain, A. & Serre, S. & Besnard, L. & Schaal, G. & Amezcua-Martinez, F. & Point, D. (2022): Mercury stable isotopes suggest reduced foraging depth in oxygen minimum zones for blue sharks. Marine Pollution Bulletin, 181, Article 113892  https://dx.doi.org/10.1016/j.marpolbul.2022.113892
Li, Z.Z. & Pethybridge, H.R. & Gong, Y. & Wu, F. & Dai, X.J. & Li, Y.K. (2022): Effect of body size, feeding ecology and maternal transfer on mercury accumulation of vulnerable silky shark Carcharhinus falciformis in the eastern tropical pacific*. Environmental Pollution, 309, Article 119751 https://dx.doi.org/10.1016/j.envpol.2022.119751
Liu, K.M. & Huang, L.H. & Su, K.Y. (2022): Assessment of the Impact on 20 Pelagic Fish Species by the Taiwanese Small-Scale Longline Fishery in the Western North Pacific Using Ecological Risk Assessment. Animals, 12(16), Article 2124 https://dx.doi.org/10.3390/ani12162124
Lopes, C. & Fernandez-Gonzalez, V. & Muniategui-Lorenzo, S. & Caetano, M. & Raimundo, J. (2022): Improved methodology for microplastic extraction from gastrointestinal tracts of fat fish species. Marine Pollution Bulletin, 181, Article 113911  https://dx.doi.org/10.1016/j.marpolbul.2022.113911
MacPherson, J. & Weinrauch, A.M. & Anderson, W.G. & Bucking, C. (2022): The gut microbiome may influence post-prandial nitrogen handling in an elasmobranch, the Pacific spiny dogfish (Squalus suckleyi). Comparative Biochemistry and Physiology a-Molecular & Integrative Physiology, 272, Article 111269 https://dx.doi.org/10.1016/j.cbpa.2022.111269
Mas, F. & Cortés, E. & Coelho, R. & Defeo, O. & Forselledo, R. & Jiménez, S. & Miller, P. & Domingo, A. (2022): Shedding rates and retention performance of conventional dart tags in large pelagic sharks: Insights from a double-tagging experiment on blue shark (Prionace glauca), Fisheries Research, 255, Article 106462 https://dx.doi.org/10.1016/j.fishres.2022.106462
Mickle, M.F. & Pieniazek, R. & Stasso, J.J. & Higgs, D.M. (2022): Anthropogenic sounds induce escape behaviour in southern stingrays Hypanus americanus. Marine Ecology Progress Series, 694, 125–132 https://dx.doi.org/10.3354/meps14100
Munoz-Arnanz, J. & Bartalini, A. & Alves, L. & Lemos, M.F. & Novais, S.C. & Jimenez, B. (2022): Occurrence and distribution of persistent organic pollutants in the liver and muscle of Atlantic blue sharks: Relevance and health risks. Environmental Pollution, 309, Article 119750 https://dx.doi.org/10.1016/j.envpol.2022.119750
Pazzaglia, U.E. & Reguzzoni, M. & Manconi, R. & Zecca, P.A. & Zarattini, G. & Campagnolo, M. & Raspanti, M. (2022): The combined cartilage growth - calcification patterns in the wing-fins of Rajidae (Chondrichthyes): A divergent model from endochondral ossification of tetrapods. Microscopy Research and Technique, in press https://dx.doi.org/10.1002/jemt.24217
Piao, Y.Z. & Bibat, M.A.D. & Hwang, S.J. & Eun, J.B. (2022): Protein degradation and texture properties of skate (Raja kenojei) muscle during fermentation. Journal of Food Science and Technology-Mysore, in press https://dx.doi.org/10.1007/s13197-022-05553-7
Plumlee, J.D. & Roskar, G. & Craig, J.K. & Fodrie, F.J. (2022): Assessing the catch efficiency of predators in the presence of prey using experimental gillnets in a temperate estuary. Fisheries Research, 253, Article 106383 https://dx.doi.org/10.1016/j.fishres.2022.106383
Porcher, I.F. & Darvell, B.W. (2022): Shark Fishing vs. Conservation: Analysis and Synthesis. Sustainability, 14(15), Article 9548 https://dx.doi.org/10.3390/su14159548
Porter, M.E. & Hernandez, A.V. & Gervais, C.R. & Rummer, J.L. (2022): Aquatic Walking and Swimming Kinematics of Neonate and Juvenile Epaulette Sharks. Integrative and Comparative Biology, in press https://dx.doi.org/10.1093/icb/icac127
Revill, A.T. & Saul, R. & Brewer, E.A. & Nichols, P.D. (2022): Using Compound-Specific Carbon Stable Isotope Analysis of Squalene to Establish Provenance and Ensure Sustainability for the Deep-Water Shark Liver Oil Industry. Sustainability, 14(15), Article 9228 https://dx.doi.org/10.3390/su14159228
Robinson, D. & Newman, S.P. & Whittingham, M.J. & Francksen, R.M. & Adam, M.S. & Stead, S.M. (2022): Fisher-shark interactions: A loss of support for the Maldives shark sanctuary from reef fishers whose livelihoods are affected by shark depredation. Conservation Letters, in press https://dx.doi.org/10.1111/conl.12912
Saldana-Ruiz, L.E. & Flores-Guzman, A. & Cisneros-Soberanis, F. & Cuevas-Gomez, G.A. & Gastelum-Nava, E. & Rocha-Tejeda, L. & Chavez, J.F. & Hernandez-Pimienta, R.E. & Melo, F. (2022): A Risk-Based Assessment to Advise the Responsible Consumption of Invertebrates, Elasmobranch, and Fishes of Commercial Interest in Mexico. Frontiers in Marine Science, 9, Article 866135 https://dx.doi.org/10.3389/fmars.2022.866135
Santos-Duran, G.N. & Ferreiro-Galve, S. & Mazan, S. & Anadon, R. & Rodriguez-Moldes, I. & Candal, E. (2022): Developmental genoarchitectonics as a key tool to interpret the mature anatomy of the chondrichthyan hypothalamus according to the prosomeric model. Frontiers in Neuroanatomy, 16, Article 901451 https://dx.doi.org/10.3389/fnana.2022.901451
Smukall, M.J. & Seitz, A.C. & Dhellemmes, F. & Bergmann, M. & Heim, V. & Gruber, S.H. & Guttridge, T.L. (2022): Residency, Site Fidelity, and Regional Movement of Tiger Sharks (Galeocerdo cuvier) at a Pupping Location in the Bahamas. Sustainability, 14(16), Article 10017 https://dx.doi.org/10.3390/su141610017
Torres, Y. & Faria, V.V. & Charvet, P. (2022): Current status and future perspectives of Neotropical freshwater stingrays (Potamotrygoninae, Myliobatiformes) genetics. Environmental Biology of Fishes, 105(8), 1111–1127 https://dx.doi.org/10.1007/s10641-022-01320-x
Vilasboa, A. & Lamarca, F. & SoléCava, A.M. & Vianna, M. (2022): Genetic evidence for cryptic species in the vulnerable spiny butterfly ray Gymnura altavela (Rajiformes: Gymnuridae). Journal of the Marine Biological Association of the United Kingdom, in press https://dx.doi.org/10.1017/S002531542200056X
Wade, M.W. & Fisher, M. & Matich, P. (2022): Comparison of two machine learning frameworks for predicting aggregatory behaviour of sharks. Journal of Applied Ecology, in press https://dx.doi.org/10.1111/1365-2664.14273
Wyffels, J.T. & George, R. & Christiansen, E.F. & Clauss, T.M. & Newton, A.L. & Hyatt, M.W. & Buckner, C. & LePage, V. & Latson, F.E. & Penfold, L.M. (2022): Reproductive Cycle and Periodicity of In Situ and Aquarium Female Sand Tiger Sharks Carcharias taurus from the Western North Atlantic. Frontiers in Marine Science, 9, Article 925749 https://dx.doi.org/10.3389/fmars.2022.925749
Xu, M. & Pethybridge, H.R. & Li, Y.K. (2022): Trophic niche partitioning of five sympatric shark species in the tropical eastern Pacific Ocean revealed by multi-tissue fatty acid analysis. Environmental Research, 214, Article 113828 https://dx.doi.org/10.1016/j.envres.2022.113828
Youn, B.I. & Choi, D.H. & Lee, S.H. & Han, K.H. & Lee, S.J. & Kwon, D.H. & Kim, M.J. (2022): Spawning Period and Size at Maturity of the Ocellate Spot Skate Okamejei kenojei in the West Sea of Korea. Journal of Marine Science and Engineering, 10(8), Article 1067 https://dx.doi.org/10.3390/jmse10081067
Zhang, C.C. & Gao, M.H. & Liu, G.Y. & Zheng, Y.H. & Xue, C. & Shen, C. (2022): Relationship Between Skin Scales and the Main Flow Field Around the Shortfin Mako Shark Isurus oxyrinchus. Frontiers in Bioengineering and Biotechnology, 10, Article 742437 https://dx.doi.org/10.3389/fbioe.2022.742437

Extinct Chondrichthyes:
Cooper, J.A. & Hutchinson, J.R. & Bernvi, D.C. & Cliff, G. & Wilson, R.P. & Dicken, M.L. & Menzel, J. & Wroe, S. & Pirlo, J. & Pimiento, C. (2022): The extinct shark Otodus megalodon was a transoceanic superpredator: Inferences from 3D modeling. Science Advances, 8(33), Article eabm9424 https://dx.doi.org/10.1126/sciadv.abm9424
Feichtinger, I. & Guinot, G. & Straube, N. & Harzhauser, M. & Auer, G. & Ćorić, S. & Kranner, M. & Schellhorn, S. & Ladwig, J. & Thies, D. & Pollerspöck, J. (2022): Revision of the Cretaceous shark Protoxynotus (Chondrichthyes, Squaliformes) and early evolution of somniosid sharks. Cretaceous Research, 140, Article 105331 https://dx.doi.org/10.1016/j.cretres.2022.105331
Hodnett, J.-P.M. & Tweet, J.S. & Santucci, V.L. (2022): The occurrence of fossil cartilaginous fishes (Chondrichthyes) within the parks and monuments of the National Park Service. New Mexico Museum of Natural History and Science Bulletin, 90, 183–208
Pollerspöck, J. (2022): Gemeinsame Forschungsprojekte von Vereinsmitgliedern und Wissenschaftlerinnen/Wissenschaftlern - eine Win-win-Situation. Jahresbericht 2010 und Mitteilungen Der Freunde der Bayerischen Staatssammlung für Paläontologie und Historische Geologie München e.V., 50, 47–52
Raquet, F.A. & Krause, T. & Krause, W. (2022): Ein besonderer Fund: Zähne und Wirbel des Makrelenhais Squalicorax kaupi (AGASSIZ, 1843) aus dem Untercampan der Grube Alemannia in Höver. Arbeitskreis Paläontologie Hannover,50, 49–61

de Carvalho, E.L. & Santana, R.L.S. & Correa, G.C. & Neto, J.L.S. & Pinheiro, R.H.D. & Giese, E.G. (2022): A new species of Huffmanela (Nematoda: Trichosomoididae) parasitizing Colomesus psittacus (Tetraodontiformes) from Marajo Island, Para State, Brazil. Revista Brasileira De Parasitologia Veterinaria, 31(3), Article e006222  https://dx.doi.org/10.1590/51984-29612022045
Irigoitia, M.M. & Levy, E. & Canel, D. & Timi, J.T. (2022): Parasites as tags for stock identification of a highly exploited vulnerable skate Dipturus brevicaudatus (Chondrichthyes: Rajidae) in the south-western Atlantic Ocean, a complementary tool for its conservation. Aquatic Conservation-Marine and Freshwater Ecosystems, in press https://dx.doi.org/10.1002/aqc.3869



Sawfish fossils suggest teeth likely evolved from body scales in ancient fish

Todd Cook using a tool to dig for fossils.

Todd Cook, associate professor of biology, Penn State Behrend, is a vertebrate paleontologist who studies ancient sharks and rays from the Paleozoic and Mesozoic of North America, North Africa and Australia. Credit: Todd Cook, Penn State (Courtesy: Wiley Publications). All Rights Reserved.

ERIE, Pa. — Scientists have long debated the origins of teeth. Did they evolve from body scales that migrated into the mouths of ancient vertebrates and became adapted for eating — an idea known as the "outside-in" hypothesis? Or did they evolve independent of scales, originating deep within the oral cavity and ultimately mounting onto the jaws — known as the "inside-out" hypothesis? A new study by scientists at Penn State provides evidence for the "outside-in" hypothesis.

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