NEWSLETTER 02/2020 12.02.2020

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

Pollerspöck, J. & Straube, N. 2020, Bibliography database of living/fossil sharks, rays and chimaeras (Chondrichthyes: Elasmobranchii, Holocephali), www.shark-references.com, World Wide Web electronic publication, Version 2020
We are working on the database report for 2019...

Please check your references..


Would you like to become a shark-reference partner? Please contanct us per E-mail!

New partner: Felipe Galvan-Magaña
Affiliation: Centro Interdisciplinario De Ciencias Marinas. Instituto Politecnico Nacional

Felipe Galvan-Magaña works on sharks and rays in Mexico and Ecuador, mainly on biological information (reproduction, age and growth, food habits, stable isotopes, heavy metals, behavior) since 2000 until now.


Partner in Google-Maps




New Images

Many thanks to the following people for providing images:

Frederik Mollen (Elasmobranch Research Belgium) for the images of Urotrygon cimar LÓPEZ S. & BUSSING, 1998 (male, 13,7 cm DW, 25,0 cm TL, Central Eastern Pacific)

Bryan Huerta for images of Hexanchus vitulus SPRINGER & WALLER, 1969 (98 cm TL, fish market in Mexico City, landed in Tabasco, Mexico, Gulf of Mexico) and Carcharhinus acronotus (POEY, 1860)

Federico Mas for a image of Centroscymnus coelolepis BARBOSA DU BOCAGE & DE BRITO CAPELLO, 1864 (juvenile, female; 361 mm LT; MHNM 4088; caught in the Southwestern Atlantic Ocean):

Sébastien EnaultKraniata Osteology for images of Triakis semifasciata GIRARD, 1855:

Hazel Oakley for a image of Rhinobatos borneensis LAST, SÉRET & NAYLOR, 2016 (Semporna, Sabah, Malaysia, fishmarket, 09.01.2020):

Itzigueri Burgos for a image of Zapteryx exasperata (JORDAN & GILBERT, 1880) (mature male, from La Paz Bay, BCS, Mexico):

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:

MATSUMOTO, H. (1936) Upper Miocene vertebrates from Kumanodô, Natori district, province of Rikuzen. Dobutsugaku Zasshi, 48: 475–480, 5 fig.

ALVINERIE, J. & ANDREIEFF, P. & ANGLADA, R. & AUBERT, J. & CAPPETTA, H. & CARALP, M. & CARATINI, C. & CARBONNEL, G. & CATZIGRAS, F. & COURME-RAULT, M.-D. & CHATEAUNEUF, J.-J. & DEMARCQ, G. & DUCASSE, O. & FATTON, E. & GLAÇON, G. & LABRACHERIE, M. & LAURIAT, A. & LE CALVEZ, Y. & LORENZ, C. & MAGNE, J. & MARGEREL, J.-P. & POIGNANT, A. & PUJOL, C. & ROGER, J. & ROMAN, J. & BLONDEAU, A. & MULLER, C. (1973) A propos de la limite oligo-miocène: résultats préliminaires d'une recherche collective sur les gisements d'Escornébéou (Saint-Géours-de-Maremne, Landes, Aquitaine méridionale). Présence de Globigerinoides dans les faunes de l'Oligocène supérieur. Comptes rendus sommaires des séances de la Société géologique de France: 75–76

KOZLOV, V.A. (2001) (A new species of carcharhinid shark from the Lower Miocene sediments of Northern Aral region) «in russian». Materialy po Stratigrafii i Paleontologii Urala, 6: 92–95

BOYD, B.M. (2016) Fossil sharks and rays of Gainesville creeks; Alachua County, Florida: Hogtown group; (middle Miocene to lower Pliocene). Florida Paleontological Society, Special Publication

Extant Chondrichthyes:

KAMOHARA, T. (1943) Some unrecorded and two new fishes from Prov. Tosa, Japan. Bulletin of the Biogeographical Society of Japan, 13 (17): 125–137

DE BUEN, F. (1950) Contribuciones a la Ictiología. II. El tiburón vitamínico de la costa uruguaya Galeorhinus vitaminicus nov. sp., y algunas consideraciones generales sobre su biología. Publicaciones Cientificas, Servicio Oceanografico y de Pesca, Ministerio de Industrias y Trabajo, Montevideo No. 4: 153–162.

CADENAT, J. (1951) Initiations Africaines. III. Poissons de Mer du Sénégal. Institute Francais d'Afrique Noire. Initiations Africaines. III. Poissons de Mer du Sénégal.: 1–345

WEIBEZAHN, F.H. (1953) Una nueva especie de Scyliorhinus de Venezuela (Chondrichthyes - Elasmobranchii). Novedades cientificas. Serie zoológica. Museo de Historia Natural La Salle, 9: 1–7.

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

SICCARDI, E. (1961) Cetorhinus en el Atlantico sur (Elasmobranchii: Cetorhinidae). Actas y trabajos del Primer Congreso Sudamericano de Zoologia, 4 (5): 251–263

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:




The 2nd Palaeontological Virtual Congress will be organized in a number of general theme sessions trying to span the whole variety of potential contributions.

However, Palaeontology is a wide discipline which encompasses a huge variety of topics.  Aware of this and taking advantage of the flexibility that virtual platforms offer, sessions proposals on emerging topics, innovative techniques or any other matter that you consider of interest are welcome to be addressed in depth during the celebration of the congress.

The purpose of such sessions is to provide a comprehensive forum for the exchange of ideas and discuss the issue within specialists in the target field.

If you are interested in proposing a specific session, please send us a brief description (no more than 300 words) with the main goals and any relevant information that you may consider relevant. Please, indicate in the proposal the full name of the organisers and their respective affiliations.

Proposals should be submitted by email to palaeovc@gmail.com before December 31st. Notification of acceptance will be sent to the organizers after that.  This edition, we want try to involve more to the participants, so if your workshop is accepted, the proposed organisers will be in charge of: 

– Look for contributions. Ideally, a single session would require the participation of at least 5 contributions, but this is only a suggestion and it is not mandatory.

– Send the abstracts to peer-review

– Moderating the sessions. We want to encourage a dialogue with all the participants, so the sessions organisers will be in charge of moderating and promoting debates in the discussion chats.



The 6th International Marine Conservation Congress

To conserve the world’s oceans we must go beyond science and use it to inform policy and management to catalyze change. The International Marine Conservation Congress (IMCC) brings together conservation professionals and students to develop new and powerful tools to further marine conservation science and policy.

With over 700 marine conservation professionals and students in attendance, IMCC is the most important international event for anyone involved or interested in marine conservation. The meeting brings together marine conservationists from many walks of life including but not limited to scientists, practitioners, educators, policy-makers, artists and journalists.

IMCC6 takes place in the sailing city of Kiel, Germany. Join us in Kiel as we come together to help Make Marine Science Matter!

for more information please visit https://conbio.org/mini-sites/imcc6


Save the date

next meeting: July 22-26, 2020 (Dates subject to change)    Norfolk, VA


Extant Chondrichthyes:

no taxonomic news this month

Extinct Chondrichthyes:

FREY, L. & COATES, M. & GINTER, M. & HAIRAPETIAN, V. & RÜCKLIN, M. & JERJEN, I. & KLUG, C. (2019): The early elasmobranch Phoebodus: phylogenetic relationships, ecomorphology and a new time-scale for shark evolution. Proceedings of the Royal Society B: Biological Sciences, 286 (1912): 20191336
New species: Phoebodus saidselachus
Abstract: Anatomical knowledge of early chondrichthyans and estimates of their phylogeny are improving, but many taxa are still known only from microremains. The nearly cosmopolitan and regionally abundant Devonian genus Phoebodus has long been known solely from isolated teeth and fin spines. Here, we report the first skeletal remains of Phoebodus from the Famennian (Late Devonian) of the Maïder region of Morocco, revealing an anguilliform body, specialized braincase, hyoid arch, elongate jaws and rostrum, complementing its characteristic dentition and ctenacanth fin spines preceding both dorsal fins. Several of these features corroborate a likely close relationship with the Carboniferous species Thrinacodus gracia, and phylogenetic analysis places both taxa securely as members of the elasmobranch stem lineage. Identified as such, phoebodont teeth provide a plausible marker for range extension of the elasmobranchs into the Middle Devonian, thus providing a new minimum date for the origin of the chondrichthyan crown-group. Among pre-Carboniferous jawed vertebrates, the anguilliform body shape of Phoebodus is unprecedented, and its specialized anatomy is, in several respects, most easily compared with the modern frilled shark Chlamydoselachus. These results add greatly to the morphological, and by implication ecological, disparity of the earliest elasmobranchs.


ÑACARI, L.A. & SEPULVEDA, F.A. & DROGUET, F. & ESCRIBANO, R. & OLIVA, M.E. (2019): Calicotyle hydrolagi n. sp. (Monogenea: Monocotylidae) infecting the deep-sea Eastern Pacific black ghost shark Hydrolagus melanophasma from the Atacama Trench, with comments on host specificity of Calicotyle spp. Parasitology International, 75: 102025
New species: Calicotyle hydrolagi
Abstract: We describe Calicotyle hydrolagi n. sp. (Monogenea: Monocotylidae) infecting the cloaca of deep-water Eastern Pacific black ghost sharks, Hydrolagus melanophasma captured as bycatch at a local fishery for Patagonian toothfish Dissostichus eleginoides, (Nototheniidae) in the Atacama Trench using morphological and nucleotide (LSU rRNA and SSU rRNA) data. This new species is differentiated from its congeners by a number of characters, including the absence of a cecal diverticula, the size and shape of the male copulatory organ and the shape of the vagina, as well as by differences in molecular data (SSU rRNA and LSU rRNA). The suitability of some sclerotized structures such as the male copulatory organ (MCO) as a taxonomic character is discussed; specifically, we found that the relationship between MCO and total length exhibit different trends in members of Calicotyle isolated from sharks, skates and chimaeras. Additional efforts to obtain sample of Calicotyle species and further molecular studies based on ribosomal and mitochondrial genes are necessary to clarify the degree of host specificity in this genus. Additionally, this is the first report of a member of Calicotyle to be reported in the Southeastern Pacific Ocean.

WARREN, M.B. & BULLARD, S.A. (2019): First elucidation of a blood fluke (Electrovermis zappum n. gen., n. sp.) life cycle including a chondrichthyan or bivalve. International Journal for Parasitology: Parasites and Wildlife, 10: 170-183
New species: Electrovermis zappum
Abstract: We describe a new fish blood fluke (Digenea: Aporocotylidae: Electrovermis zappum n. gen., n. sp.) and its life cycle in the intertidal zone adjacent to Mobile Bay (north-central Gulf of Mexico). This is the first elucidated aporocotylid life cycle that includes a chondrichthyan definitive host or a bivalve intermediate host. The new species undergoes asexual reproduction within the gonad of the variable coquina clam before maturing in the heart of the lesser electric ray. These adults and cercariae had identical 28S, 18S, and ITS2 nucleotide sequences. The new genus is similar to Ogawaia Cutmor et al., 2018 by having an inverse U-shaped intestine, a looping testis, and a uterus having distinct ascending and descending segments. It differs by having a body that is ≥ 30 × longer than wide, a testis with >30 curves, an obvious cirrus sac enveloping an extremely elongate cirrus, an ovary anterior to the seminal vesicle, and a post-gonadal uterus. The new species further differs from the type species of Ogawaia (Ogawaia glaucostegi Cutmore et al., 2018) by having a massive seminal vesicle (>10% of body length), a cirrus sac enveloping an extremely elongate cirrus, and a slightly sinuous uterus. Histology confirmed gametogenesis in an infected coquina clam but no discernible cellular response to infection was observed. We also i) characterize a second morphologically and genetically distinct cercaria (perhaps representing an innominate chondrichthyan aporocotylid) infecting the green jackknife clam in Mississippi Sound (north-central Gulf of Mexico), ii) compare all known aporocotylid cercariae infecting estuarine and marine mollusks and polychaetes and iii) provide a key to identify those cercariae. A phylogenetic analysis including nucleotide sequences from adult and cercarial specimens of the newly collected fish blood flukes further supports the notion that chondrichthyan aporocotylids are monophyletic and use bivalves as the first intermediate host; perhaps unlike any other blood fluke lineage.


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

Latest Research Articles

Extant Chondrichthyes:
ALMEIDA, A.J. & BISCOITO, M. (2019) Keys to the fishes of the Eastern Atlantic Ocean, Mediterranean Sea and Black Sea. I – Myxini; Petromyzontida; Chondrichthyes Boletim do Museu de História Natural do Funchal, Suppl. 15: 1-195
ARMSTRONG, A.J. & ARMSTRONG, A.O. & BENNETT, M.B. & MCGREGOR, F. & ABRANTES, K.G. & BARNETT, A. & RICHARDSON, A.J. & TOWNSEND, K.A. & DUDGEON, C.L. (2020) The geographic distribution of reef and oceanic manta rays (Mobula alfredi and Mobula birostris) in Australian coastal waters. Journal of Fish Biology, in press  https://dx.doi.org/10.1111/jfb.14256
ARMSTRONG, A.O. & ARMSTRONG, A.J. & BENNETT, M.B. & RICHARDSON, A.J. & TOWNSEND, K.A. & DUDGEON, C.L. (2020) Photographic identification and citizen science combine to reveal long distance movements of individual reef manta rays Mobula alfredi along Australia’s east coast. Marine Biodiversity Records, 12: 14 https://dx.doi.org/10.1186/s41200-019-0173-6
BURGOS-VÁZQUEZ, M.I. & GONZÁLEZ-GONZÁLEZ, L.V. & MEJÍA-FALLA, P.A. & CRUZ-ESCALONA, V.H. (2019) First record of monoclasper in the Banded guitarfish, Zapteryx exasperata in the Gulf of California, Mexico. CICIMAR Oceánides, 34(1): 41-44  
CLUA, E.E.G. & HAGUENAUER, A. (2020) Nonfatal Bites by a Sicklefin Lemon Shark Negaprion acutidens on a Surfer in Makemo Atoll (French Polynesia). Journal of Forensic Sciences, in press https://dx.doi.org/10.1111/1556-4029.14228
COCHRAN, J.E.M. & BRAUN ,C.D. & CAGUA, E.F. & CAMPBELL, M.F. & HARDENSTINE, R.S. & KATTAN, A. & PRIEST, M.A. & SINCLAIR-TAYLOR, T.H. & SKOMAL, G.B. & SULTAN, S. & SUN, L. & THORROLD, S.R. & BERUMEN, M.L. (2019) Multi-method assessment of whale shark (Rhincodon typus) residency, distribution, and dispersal behavior at an aggregation site in the Red Sea. PLoS ONE, 14 (9): e0222285 https://dx.doi.org/10.1371/journal.pone.0222285
COIRATON, C. & AMEZCUA, F. (2020) In utero elemental tags in vertebrae of the scalloped hammerhead shark Sphyrna lewini reveal migration patterns of pregnant females. Scientific Reports, 10: 1799 https://dx.doi.org/10.1038/s41598-020-58735-8
DCNA  (2019) The Yarari Marine Mammal and Shark Sanctuary. Dutch Caribbean Nature Alliance, 66pp.
DUDGEON, C.L. & CORRIGAN, S. & YANG, L. & ALLEN, G.R. & ERDMANN, M.V. & FAHMI & SUGEHA, H.Y. & WHITE, W.T. & NAYLOR, G.J.P. (2020) Walking, swimming or hitching a ride? Phylogenetics and biogeography of the walking shark genus Hemiscyllium. Marine and Freshwater Research, in press https://dx.doi.org/10.1071/MF19163
DZIERGWA, J. & SINGH, S. & BRIDGES, C.R. & KERWATH, S.E. & ENAX, J. & AUERSWALD, L. (2019) Acid-base adjustments and first evidence of denticle corrosion caused by ocean acidification conditions in a demersal shark species. Scientific Reports, 9: 18668
FEITOSA, L.M. & MARTINS, L.P. & DE SOUZA, L.A. & LESSA, R.P. (2020) Potential distribution and population trends of the smalltail shark Carcharhinus porosus inferred from species distribution models and historical catch data. Aquatic Conservation: Marine and Freshwater Ecosystems, in press https://dx.doi.org/10.1002/aqc.3293
HACOHEN-DOMENÉ, A. & POLANCO-VÁSQUEZ, F. & ESTUPIÑAN-MONTAÑO, C. & GRAHAM, R.T. (2020) Description and characterization of the artisanal elasmobranch fishery on Guatemala’s Caribbean coast. PLoS ONE, 15 (1): e0227797 https://dx.doi.org/10.1371/journal.pone.0227797
JAMES, K.C. (2020) Vertebral growth and band-pair deposition in sexually mature little skates Leucoraja erinacea: is adult band-pair deposition annual? Journal of Fish Biology, 96 (1): 4-13 https://dx.doi.org/10.1111/jfb.14141
JOHRI, S. & FELLOWS, S.R. & SOLANKI, J. & BUSCH, A. & LIVINGSTON, I. & MORA, M.F. & TIWARI, A. & CANTU, V.A. & GOODMAN, A. & MORRIS, M.M. & DOANE, M.P. & EDWARDS, R.A. & DINSDALE, E.A. (2020) Mitochondrial genome to aid species delimitation and effective conservation of the Sharpnose Guitarfish (Glaucostegus granulatus). Meta Gene, 24: 100648 https://dx.doi.org/10.1016/j.mgene.2020.100648
KELLY, M.L. & COLLIN, S.P. & HEMMI, J.M. & LESKU, J.A. (2019) Evidence for Sleep in Sharks and Rays: Behavioural, Physiological, and Evolutionary Considerations. Brain, Behavior and Evolution, 94: 37–50 https://dx.doi.org/10.1159/000504123
LARSEN, M.E. & ABEL, D.C. & CRANE, D.P. & PARKER, S.L. & YANCEY, P.H. & KELLER, B.A. & GRUBBS, R.D. (2019) Unique osmoregulatory morphology in primitive sharks: an intermediate state between holocephalan and derived shark secretory morphology. Journal of Fish Biology, 95 (5): 1331-1341 https://dx.doi.org/10.1111/jfb.14139
LEAR, K.O. & POULAKIS, G.R. & SCHARER, R.M. & GLEISS, A.C. & WHITNEY, N.M. (2019) Fine-scale behavior and habitat use of the endangered smalltooth sawfish (Pristis pectinata): insights from accelerometry. Fishery Bulletin, 117 (4): 348–359 https://dx.doi.org/10.7755/FB.117.4.7
LESTER, E. & MEEKAN, M.G. & BARNES, P. & RAUDINO, H. & ROB, D. & WAPLES, K. & SPEED, C.W. (2020) Multi-year patterns in scarring, survival and residency of whale sharks in Ningaloo Marine Park, Western Australia. Marine Ecology Progress Series, 634: 115-125 https://dx.doi.org/10.3354/meps13173
MAS, F. & FORSELLEDO, R. & DOMINGO, A. & PIN, O. & TRONCOSO, P. & ERRICO, E. & MARQUEZ, A. & TANAKA, S. & WEIGMANN, S. (2020) New records and range extension of the Portuguese dogfish Centroscymnus coelolepis in the Southwestern Atlantic Ocean, with comments on its morphology. Journal of Fish Biology, in press https://dx.doi.org/10.1111/jfb.14246
MCGREGOR, F. & RICHARDSON, A.J. & ARMSTRONG, A.J. & ARMSTRONG, A.O. & DUDGEON, C.L. (2019) Rapid wound healing in a reef manta ray masks the extent of vessel strike. PLoS ONE, 14 (12): e0225681 https://dx.doi.org/10.1371/journal.pone.0225681
MCMILLAN, O.J.L. & DICHIERA, A.M. HARTER, T.S. & WILSON, J.M. & ESBAUGH, A.J. & BRAUNER, C.J. (2019) Blood and Gill Carbonic Anhydrase in the Context of a Chondrichthyan Model of CO2 Excretion. Physiological and Biochemical Zoology, 92 (6): 554-566 https://dx.doi.org/10.1086/705402
NAKAYAMA, N. & MATSUNUMA, M. & ENDO, H. (2020) A preliminary review and in situ observations of the spookfish genus Harriotta (Holocephali: Rhinochimaeridae). Ichthyological Research, 67 (1): 82–91 https://dx.doi.org/10.1007/s10228-019-00703-y
RAMÍREZ-AMARO, S. & ORDINES, F. & ESTEBAN, A. & GARCÍA, C. & GUIJARRO, B. & SALMERÓN, F. & TERRASA, B. & MASSUTÍ, E. (2020) The diversity of recent trends for chondrichthyans in the Mediterranean reflects fishing exploitation and a potential evolutionary pressure towards early maturation. Scientific Reports, 10: 547 https://dx.doi.org/10.1038/s41598-019-56818-9
RAOULT, V. & BROADHURST, M.K. & PEDDEMORS, M. & WILLIAMSON, M.E. & GASTON, M.F. (2019) Resource use of great hammerhead sharks Sphyrna mokarran off eastern Australia. Journal of Fish Biology, 95 (6): 1430-1440 https://dx.doi.org/10.1111/jfb.14160
RÊGO, M.G. & ARAUJO, M.L.G. & BARROS, M.E.G. & D’ANDRADE AIRES, L. & OLIVEIRA, P.G.V. & HAZIN, F.H.V. & FITZPATRICK, J.L. & EVÊNCIO-NETO, J. (2019) Morphological description of ovary and uterus of the nurse shark (Ginglymostoma cirratum) caught off at the Fortaleza coast, Northeast Brazil [Descrição morfológica de ovário e útero de Tubarões-lixa (Ginglymostoma cirratum) capturados na costa de Fortaleza, Nordeste do Brasil]. Pesquisa Veterinária Brasileira, 39 (12): 997-1004 https://dx.doi.org/10.1590/1678-5150-pvb-6141
RUELAS-INZUNZA, J. & AMEZCUA, F. & COIRATON, C. & PÁEZ-OSUNA, F. (2020) Cadmium, mercury, and selenium in muscle of the scalloped hammerhead Sphyrna lewini from the tropical Eastern Pacific: Variation with age, molar ratios and human health risk. Chemosphere, 242: 125180 https://dx.doi.org/10.1016/j.chemosphere.2019.125180
SCHNETZ, L. & PFAFF, C. & LIBOWITZKY, E. & JOHANSON, Z. & STEPANEK, R. & KRIWET, J. (2019) Morphology and evolutionary significance of phosphatic otoliths within the inner ears of cartilaginous fishes (Chondrichthyes). BMC Evolutionary Biology, 19: 238 https://dx.doi.org/10.1186/s12862-019-1568-z
SIGSGAARD, E.E. & TORQUATO, F. & FRØSLEV, T.G. & MOORE, A.B.M. & SØRENSEN, J.M. & RANGE, P. & BEN-HAMADOU, R. & BACH, S.S. & MØLLER, P.R. & THOMSEN, P.F. (2019) Using vertebrate environmental DNA from seawater in biomonitoring of marine habitats. Conservation Biology, in press https://dx.doi.org/10.1111/cobi.13437
TURNER, N. & MIKALAUSKAITE, D. & BARONE, K. & FLAHERTY, K. & SENEVIRATHNE, G. & ADACHI, N. & SHUBIN, N.H. & NAKAMURA, T. (2019) The evolutionary origins and diversity of the neuromuscular system of paired appendages in batoids. Proceedings of the Royal Society B: Biological Sciences, 286 (1914): 20191571 https://dx.doi.org/10.1098/rspb.2019.1571
VENABLES, S.K. & VAN DUINKERKEN, D.I. & ROHNER, C.A. & MARSHALL, A.D. (2020) Habitat use and movement patterns of reef manta rays Mobula alfredi in southern Mozambique. Marine Ecology Progress Series, 634: 99-114 https://dx.doi.org/10.3354/meps13178
WHITMARSH, S.K. & AMIN, D.B. & COSTI, J.J. & DENNIS, J.D. & HUVENEERS, C. (2019) Effectiveness of novel fabrics to resist punctures and lacerations from white shark (Carcharodon carcharias): Implications to reduce injuries from shark bites. PLoS ONE, 14 (11): e0224432 https://dx.doi.org/10.1371/journal.pone.0224432
WYFFELS, J.T. & GEORGE, R. & ADAMS, L. & ADAMS, C. & CLAUSS, T. & NEWTON, A. & HYATT, M.W. & YACH, C. & PENFOLD, L.M. (2019) Testosterone and semen seasonality for the sand tiger shark Carcharias taurus. Biology of Reproduction: ioz221  https://dx.doi.org/10.1093/biolre/ioz221

Extinct Chondrichthyes:

AMALFITANO, J. & AMADORI, M. & GIUSBERTI, L. & FORNACIARI, E. & CARNEVALE, G. & KRIWET, J. (2020) A revision of the Upper Cretaceous shark Ptychodus mediterraneus Canavari, 1916 from Italy, with a reassessment of P. latissimus and P. polygyrus Agassiz, 1835 (Chondrichthyes; Elasmobranchii). Cretaceous Research, in press https://linkinghub.elsevier.com/retrieve/pii/S0195667119303404
FREY, L. & COATES, M. & GINTER, M. & HAIRAPETIAN, V. & RÜCKLIN, M. & JERJEN, I. & KLUG, C. (2019) The early elasmobranch Phoebodus: phylogenetic relationships, ecomorphology and a new time-scale for shark evolution. Proceedings of the Royal Society B: Biological Sciences, 286 (1912): 20191336 https://dx.doi.org/10.1098/rspb.2019.1336
GUINOT, G. & AMOUDJI, Y.Z. & KASSEGNE, K.E. & SARR, R. & JOHNSON, A.K.C. & DA COSTA, P.Y.D. & HAUTIER, L. (2020) Elasmobranchs from the upper Palaeocene of Togo. Geobios, in press https://dx.doi.org/10.1016/j.geobios.2019.12.003
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Walking sharks discovered in the tropics

Date: January 21, 2020
Source: University of Queensland
Summary: Four new species of tropical sharks that use their fins to walk are causing a stir in waters off northern Australia and New Guinea.

Sharp increase in Ningaloo whale shark injuries might be due to boat encounters

Scarring and major lacerations due to vessel collisions becoming more common, study finds

Date: January 23, 2020
Source: Australian Institute of Marine Science
Summary: Almost one-fifth of the whale sharks (Rhincodon typus) in Western Australia's Ningaloo Reef Marine Park show major scarring or fin amputations, with the number of injured animals increasing in recent years, new research reveals.

Ocean acidification is damaging shark scales

Date: January 8, 2020
Source: Heinrich-Heine University Duesseldorf
Summary: Sharks have unusual type of scales referred to as 'denticles.' A research group has examined the impact of climate change in the form of ocean acidification on these structures. The researchers uncovered damage to the denticles.