Cretoxyrhina agassizensis
(Underwood & Cumbaa, 2010)
Classification: Elasmobranchii Lamniformes Cretoxyrhinidae
Reference of the original description
Chondrichthyans from a Cenomanian (Late Cretaceous) bonebed, Saskatchewan, Canada. Palaeontology, 53(4), 903–944
Chondrichthyans from a Cenomanian (Late Cretaceous) bonebed, Saskatchewan, Canada. Palaeontology, 53(4), 903–944
Synonyms / new combinations and misspellings
Telodontaspis agassizensis
Telodontaspis agassizensis
Description:
Citation: Cretoxyrhina agassizensis (Underwood & Cumbaa, 2010): In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 09/2026
No image available.
Please send your images of "Cretoxyrhina agassizensis" to
info@shark-references.com
Please send your images of "Cretoxyrhina agassizensis" to
info@shark-references.com
Description
Original diagnosis after Underwood & Cumbaa, 2010 [12632]: As for genus: Strong monognathic and dignathic heterodont dentition with anterior teeth up to 12 mm high. Several files of upper and lower parasymphyseal teeth and upper intermediate teeth present. Cusp unornamented, slender and straight, at least 3 times as high as wide, inclined to posterior in lateral teeth and faintly labiolingually sigmoidal in anterior teeth. Single pair of small, triangular, lateral cusplets present in upper lateral teeth, absent in all other teeth. Base of crown with prominent neck on lingual side, and extends along upper third to half of root lobe on labial side. Cutting edge continuous in lateral teeth but not reaching base of crown on anterior teeth. Crown does not overhang root. Root with two clearly defined lobes, of roughly equal size in lower teeth, but with anterior lobe longer than posterior in upper teeth. Lingual face of root with poorly developed lingual protuberance, below which root lobes are either labiolingually compressed with a flat linguo-basal root face in upper lateral teeth, or somewhat expanded lingually with no clearly defined linguo-basal root face. There is a welldeveloped round to slightly elongate foramen at the apex of the lingual protuberance, with very small foramina spread across the root surface.
Original diagnosis after Underwood & Cumbaa, 2010 [12632]: As for genus: Strong monognathic and dignathic heterodont dentition with anterior teeth up to 12 mm high. Several files of upper and lower parasymphyseal teeth and upper intermediate teeth present. Cusp unornamented, slender and straight, at least 3 times as high as wide, inclined to posterior in lateral teeth and faintly labiolingually sigmoidal in anterior teeth. Single pair of small, triangular, lateral cusplets present in upper lateral teeth, absent in all other teeth. Base of crown with prominent neck on lingual side, and extends along upper third to half of root lobe on labial side. Cutting edge continuous in lateral teeth but not reaching base of crown on anterior teeth. Crown does not overhang root. Root with two clearly defined lobes, of roughly equal size in lower teeth, but with anterior lobe longer than posterior in upper teeth. Lingual face of root with poorly developed lingual protuberance, below which root lobes are either labiolingually compressed with a flat linguo-basal root face in upper lateral teeth, or somewhat expanded lingually with no clearly defined linguo-basal root face. There is a welldeveloped round to slightly elongate foramen at the apex of the lingual protuberance, with very small foramina spread across the root surface.
Remarks
shark-references Species-ID=14305;
shark-references Species-ID=14305;
References
A New Marine Vertebrate Assemblage from the Upper Cretaceous Lincoln Limestone, Comanche National Grassland, Southeastern Colorado, USA, with Comments on the Vertebrate Assemblages at or Near the Contact between the Graneros Shale and Greenhorn Limestone in Colorado, Kansas, and Nebraska. Transactions of the Kansas Academy of Science, 128 (3-4), 180–200
DOI: 10.1660/062.128.0302
Global impact and selectivity of the Cretaceous-Paleogene mass extinction among sharks, skates, and rays. Science, 379, 802–806
DOI: 10.1126/science.abn2080
A review of Australia’s Mesozoic fishes. Alcheringa, 44(2), 286-311
DOI: 10.1080/03115518.2019.1701078
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
Late Cretaceous Marine Vertebrate Fauna from the Fairport Chalk Member of the Carlile Shale in Southern Ellis County, Kansas, U.S.A. Transactions of the Kansas Academy of Science, 119(2), 222–230
DOI: 10.1660/062.119.0214
Vertebral morphology, dentition, age, growth, and ecology of the large lamniform shark Cardabiodon ricki. Acta Palaeontologica Polonica, 60(4), 877–897
DOI: 10.4202/app.2012.0047
A New Late Cretaceous Marine Vertebrate Assemblage from the Lincoln Limestone Member of the Greenhorn Limestone in Southeastern Colorado. Transactions of the Kansas Academy of Science, 115(3–4), 107–116
DOI: 10.1660/062.115.0303
Chondrichthyans from a Cenomanian (Late Cretaceous) bonebed, Saskatchewan, Canada. Palaeontology, 53(4), 903–944
DOI: 10.1111/j.1475-4983.2010.00969.x
Mid-Cenomanian vertebrate faunas of the WesternInterior Seaway of North America and their evolutionary, paleobiogeographical, and paleoecological implications. Palaeogeography, Palaeoclimatology, Palaeoecology, 295(1–2), 199–214
DOI: 10.1016/j.palaeo.2010.05.038

A New Marine Vertebrate Assemblage from the Upper Cretaceous Lincoln Limestone, Comanche National Grassland, Southeastern Colorado, USA, with Comments on the Vertebrate Assemblages at or Near the Contact between the Graneros Shale and Greenhorn Limestone in Colorado, Kansas, and Nebraska. Transactions of the Kansas Academy of Science, 128 (3-4), 180–200
DOI: 10.1660/062.128.0302

Global impact and selectivity of the Cretaceous-Paleogene mass extinction among sharks, skates, and rays. Science, 379, 802–806
DOI: 10.1126/science.abn2080

A review of Australia’s Mesozoic fishes. Alcheringa, 44(2), 286-311
DOI: 10.1080/03115518.2019.1701078

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

Late Cretaceous Marine Vertebrate Fauna from the Fairport Chalk Member of the Carlile Shale in Southern Ellis County, Kansas, U.S.A. Transactions of the Kansas Academy of Science, 119(2), 222–230
DOI: 10.1660/062.119.0214
Vertebral morphology, dentition, age, growth, and ecology of the large lamniform shark Cardabiodon ricki. Acta Palaeontologica Polonica, 60(4), 877–897
DOI: 10.4202/app.2012.0047

A New Late Cretaceous Marine Vertebrate Assemblage from the Lincoln Limestone Member of the Greenhorn Limestone in Southeastern Colorado. Transactions of the Kansas Academy of Science, 115(3–4), 107–116
DOI: 10.1660/062.115.0303

Chondrichthyans from a Cenomanian (Late Cretaceous) bonebed, Saskatchewan, Canada. Palaeontology, 53(4), 903–944
DOI: 10.1111/j.1475-4983.2010.00969.x

Mid-Cenomanian vertebrate faunas of the WesternInterior Seaway of North America and their evolutionary, paleobiogeographical, and paleoecological implications. Palaeogeography, Palaeoclimatology, Palaeoecology, 295(1–2), 199–214
DOI: 10.1016/j.palaeo.2010.05.038








