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Cetorhinus piersoni
Taxonomy
Cetorhinus piersoni was named by Welton (2015). Its type specimen is LACM 155792, a tooth (complete adult tooth), and it is a 3D body fossil. Its type locality is Beverly Beach State Park, Burdigalian, which is in a Burdigalian open shallow subtidal mudstone in the Astoria Formation of Oregon.
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Cetorhinus piersoni Welton p. 70 figs. Figures 4–7 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Cetorhinus piersoni Welton 2015
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. J. Welton 2015 | A species of Cetorhinus, apparently smaller as adults than the Recent C. maximus and extinct C. huddlestoni; differing from C. maximus and C. huddlestoni by having many adult teeth with robust, broad-based triangular crowns, although there is a wide range of variation in crown shape; crown height in labial view greater than 2.5 times root height; cutting edges smooth, but anomalous ‘‘pseudoserrations’’ develop on the lower half of the crown on some large adult teeth; short longitudinal enameloid ridges developed on lingual crown face near cusp apex in approximately 50% of teeth; enameloid folds at the labial crown foot occasionally present on largest teeth, but generally absent; differing further from C. maximus by having weak lingual cusp inclination, with cusp apex rarely extending beyond protuberance; pronounced axial twist in the distal half to third of cusp such that the labial crown face on the distal end of the cusp may lie in a plain almost normal to the lingual crown face; crown margins not strongly constricted in most teeth at level of crown–root junction; cutting edges extend from cusp apex basally for a distance of one-half to two-thirds or more of the crown height, reaching the crown foot in some large adult teeth; cusplets usually absent or sometimes developed above the mesial crown foot, as a short, labiolingually compressed bladelike structure; root lobes well developed, widely diverging, short, tabular near distal ends, or rounded and robust; lingual protuberance ranges from strongly convex and developed over the entire lingual root face, to small and robust, positioned high on the root near the crown foot, or low on the root, just above the basal attachment surface; basal margin of root, between the mesial and distal root lobes, is apically convex, broadly rounded to subangular; differing further from C. huddlestoni by having a rounded cusp apex in many teeth. |
Measurements
No measurements are available
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| Source: f = family, subp = subphylum | |||||
| References: Purdy 1988, Wagner 2023, Carroll 1988 | |||||
Age range: Burdigalian or 20.44000 to 15.97000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Burdigalian | USA (Oregon) | Cetorhinus piersoni (type locality: 221703) |