Paraptychodus washitaensis
Hamm, 2015
Classification: Elasmobranchii incert. sedis Ptychodontidae
Reference of the original description
Paraptychodus washitaensis n. gen. et n. sp., of Ptychodontid shark from the Albian of Texas, USA. Cretaceous Research, 54, 60–67
Paraptychodus washitaensis n. gen. et n. sp., of Ptychodontid shark from the Albian of Texas, USA. Cretaceous Research, 54, 60–67
Description:
Citation: Paraptychodus washitaensis Hamm, 2015: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 09/2026
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Description
Original diagnosis after Hamm, 2015 [21915]: Crown of medial tooth file high and rounded, crossed by five to six distinctly raised, closely spaced parallel transverse ridges. Lateral file teeth rectangular to rhombic with low, rounded and broad crowns with four to five transverse ridges; posterior files rhombic with an inclined, pointed and triangular crown and one to three raised transverse ridges. In all teeth transverse ridges cover entire crown surface, anastomose and bifurcate at the lateral crown edges; marginal area is lacking; tooth root hybodontid with labial protuberance and lingual sulcus being features of the tooth root not crown.
Original diagnosis after Hamm, 2015 [21915]: Crown of medial tooth file high and rounded, crossed by five to six distinctly raised, closely spaced parallel transverse ridges. Lateral file teeth rectangular to rhombic with low, rounded and broad crowns with four to five transverse ridges; posterior files rhombic with an inclined, pointed and triangular crown and one to three raised transverse ridges. In all teeth transverse ridges cover entire crown surface, anastomose and bifurcate at the lateral crown edges; marginal area is lacking; tooth root hybodontid with labial protuberance and lingual sulcus being features of the tooth root not crown.
References
Stratigraphic, Geographic, and Paleoecological Distribution of the Late Cretaceous Shark Genus Ptychodus within the Western Interior Seaway, North America. New Mexico Museum of Natural History and Science, Bulletin, 81, 1–94
Paraptychodus washitaensis n. gen. et n. sp., of Ptychodontid shark from the Albian of Texas, USA. Cretaceous Research, 54, 60–67
DOI: 10.1016/j.cretres.2014.10.015
Systematic, stratigraphic, geographic, and paleoecological distribution of the Late Cretaceous shark genus Ptychodus within the Western Interior Seaway. Unpublished MS thesis, University of Texas, Dallas, 434 pp
Stratigraphic, Geographic, and Paleoecological Distribution of the Late Cretaceous Shark Genus Ptychodus within the Western Interior Seaway, North America. New Mexico Museum of Natural History and Science, Bulletin, 81, 1–94
Paraptychodus washitaensis n. gen. et n. sp., of Ptychodontid shark from the Albian of Texas, USA. Cretaceous Research, 54, 60–67
DOI: 10.1016/j.cretres.2014.10.015
Systematic, stratigraphic, geographic, and paleoecological distribution of the Late Cretaceous shark genus Ptychodus within the Western Interior Seaway. Unpublished MS thesis, University of Texas, Dallas, 434 pp
