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Taxonomy
Cetotherium riabinini was named by Hofstein (1948). Its type specimen is NMNH-P 668/1, a partial skeleton, and it is a 3D body fossil. Its type locality is Nikolaev, which is in a Tortonian shallow subtidal horizon in the Chersonian Formation of Ukraine.
It was considered an invalid subgroup of Cetotherium by Gol'din and Steeman (2015).
It was considered an invalid subgroup of Cetotherium by Gol'din and Steeman (2015).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1948 | Cetotherium riabinini Hofstein |
| 1965 | Cetotherium riabinini Hofstein p. 25 |
| 2014 | Cetotherium riabinini Goldin and Startsev p. 419 figs. Figure 13 |
| 2015 | Cetotherium riabinini Marx and Fordyce p. 4 figs. Figure 2 |
| 2016 | Cetotherium riabinini Marx et al. p. 22 figs. Figure 10 |
| 2017 | Cetotherium riabinini Goldin and Startsev figs. Table 1 |
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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.
†Cetotherium riabinini Hofstein 1948
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. Goldin et al. 2014 | Species of Cetotherium differing from C. rathkii in having: (i) a triangular nasal that gradually ta- pers posteriorly (as opposed to being wedge-like and strongly compressed); (ii) the anterior edge of nasal located just posterior to the level of the antorbital notch (not far posterior as in C. rathkii); (iii) an elongated posterior portion of the facial skull; (iv) a V-shaped, notched anterior margin of the palatines; (v) an angular (as opposed to gradually curved) anterior edge of the supraorbital process of the frontal; (vi) the distal portion of the postglenoid process of the squamosal bent medially, protruding dorsally and posteriorly (not posteroventrally as in C. rathkii); (vii) a convex nuchal crest in dorsal view; and (viii) a sigmoid process of the tympanic bulla oriented slightly posteriorly (not perpendicularly to the long axis of the bulla as in C. rathkii). |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||