Nanocorax microserratodon
(Shimada, 2008)
Classification: Elasmobranchii Lamniformes Anacoracidae
Reference of the original description
New anacoracid shark from Upper Cretaceous Niobrara Chalk of western Kansas, U.S.A. Journal of Vertebrate Paleontology, 28(4), 1189–1194
New anacoracid shark from Upper Cretaceous Niobrara Chalk of western Kansas, U.S.A. Journal of Vertebrate Paleontology, 28(4), 1189–1194
Synonyms / new combinations and misspellings
Squalicorax microserratodon
Squalicorax microserratodon
Description:
Citation: Nanocorax microserratodon (Shimada, 2008): In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 10/2024
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Description
Original diagnose after Shimada (2008) p. 1189 [4646]: Small teeth (measuring up to approximately 4 mm in total tooth height in holotype); crown highly asymmetrical because of distally inclined, triangular cusp and gently convex distal heel; lingual face of cusp and distal heel more convex than their labial face; mesial cusp margin gently convex or slightly indented at middle; distal cusp margin straight or slightly concave except near its apex that tends to be slightly convex; distal heel apicobasally low and mesiodistally short, and poorly demarcated from distal edge of cusp in more erect, presumably anteriorly located teeth; small but well-defined serrations along cusp and distal heel margins; distally directed cusp apex not extending beyond distal demarcation of distal heel; tooth neck between crown and root on lingual face rather narrow; crown base on labial side weakly overhanging bilobed root; basal concavity of root between lobes gently arched ( shallow and broad); lingual root face gently separated into apical and basal faces without lingual protuberance at middle; many minute shallow pits (= porous) particularly on basal face of lingual root face as well as middle of labial root face.
Original diagnose after Shimada (2008) p. 1189 [4646]: Small teeth (measuring up to approximately 4 mm in total tooth height in holotype); crown highly asymmetrical because of distally inclined, triangular cusp and gently convex distal heel; lingual face of cusp and distal heel more convex than their labial face; mesial cusp margin gently convex or slightly indented at middle; distal cusp margin straight or slightly concave except near its apex that tends to be slightly convex; distal heel apicobasally low and mesiodistally short, and poorly demarcated from distal edge of cusp in more erect, presumably anteriorly located teeth; small but well-defined serrations along cusp and distal heel margins; distally directed cusp apex not extending beyond distal demarcation of distal heel; tooth neck between crown and root on lingual face rather narrow; crown base on labial side weakly overhanging bilobed root; basal concavity of root between lobes gently arched ( shallow and broad); lingual root face gently separated into apical and basal faces without lingual protuberance at middle; many minute shallow pits (= porous) particularly on basal face of lingual root face as well as middle of labial root face.
References
Global impact and selectivity of the Cretaceous-Paleogene mass extinction among sharks, skates, and rays. Science, 379, 802–806
DOI: 10.1126/science.abn2080
Fossil vertebrates from a unique marine bonebed of the Upper Cretaceous Smoky Hill Chalk, western Kansas, USA: new insights into the paleoecology of the Niobrara Formation. Journal of Vertebrate Paleontology, 41(6), Article e2066999
DOI: 10.1080/02724634.2021.2066999
Feeding ecology has shaped the evolution of modern sharks. Current Biology, 31(23), 5138–5148
DOI: 10.1016/j.cub.2021.09.028
Climate cooling and clade competition likely drove the decline of lamniform sharks. Proceedings of the National Academy of Sciences of the United States of America, 116(41), 20584–20590
DOI: 10.1073/pnas.1902693116
Sharks (Elasmobranchii: Euselachii) from the Late Cretaceous of France and the UK. Journal of Systematic Palaeontology, 11(6), 589–671
DOI: 10.1080/14772019.2013.767286
Late Cretaceous elasmobranch palaeoecology in NW Europe. Palaeogeography, Palaeoclimatology, Palaeoecology, 388, 23–41
DOI: 10.1016/j.palaeo.2013.07.027
Regional to global patterns in Late Cretaceous selachian (Chondrichthyes, Euselachii) diversity. Journal of Vertebrate Paleontology, 33(3), 521–531
DOI: 10.1080/02724634.2013.740116
New anacoracid shark from Upper Cretaceous Niobrara Chalk of western Kansas, U.S.A. Journal of Vertebrate Paleontology, 28(4), 1189–1194
DOI: 10.1671/0272-4634-28.4.1189
Global impact and selectivity of the Cretaceous-Paleogene mass extinction among sharks, skates, and rays. Science, 379, 802–806
DOI: 10.1126/science.abn2080
Fossil vertebrates from a unique marine bonebed of the Upper Cretaceous Smoky Hill Chalk, western Kansas, USA: new insights into the paleoecology of the Niobrara Formation. Journal of Vertebrate Paleontology, 41(6), Article e2066999
DOI: 10.1080/02724634.2021.2066999
Feeding ecology has shaped the evolution of modern sharks. Current Biology, 31(23), 5138–5148
DOI: 10.1016/j.cub.2021.09.028
Climate cooling and clade competition likely drove the decline of lamniform sharks. Proceedings of the National Academy of Sciences of the United States of America, 116(41), 20584–20590
DOI: 10.1073/pnas.1902693116
Sharks (Elasmobranchii: Euselachii) from the Late Cretaceous of France and the UK. Journal of Systematic Palaeontology, 11(6), 589–671
DOI: 10.1080/14772019.2013.767286
Late Cretaceous elasmobranch palaeoecology in NW Europe. Palaeogeography, Palaeoclimatology, Palaeoecology, 388, 23–41
DOI: 10.1016/j.palaeo.2013.07.027
Regional to global patterns in Late Cretaceous selachian (Chondrichthyes, Euselachii) diversity. Journal of Vertebrate Paleontology, 33(3), 521–531
DOI: 10.1080/02724634.2013.740116
New anacoracid shark from Upper Cretaceous Niobrara Chalk of western Kansas, U.S.A. Journal of Vertebrate Paleontology, 28(4), 1189–1194
DOI: 10.1671/0272-4634-28.4.1189