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Plaesiomys occidentalis
Taxonomy
Dinorthis (Plaesiomys) subquadrata occidentalis was named by Ladd (1929). Its type specimen is SUI 66504 and is a 3D body fossil.
It was recombined as Plaesiomys subquadratus occidentalis by Wang (1949); it was recombined as Plaesiomys occidentalis by Wright and Stigall (2013).
It was recombined as Plaesiomys subquadratus occidentalis by Wang (1949); it was recombined as Plaesiomys occidentalis by Wright and Stigall (2013).
Synonymy list
| Year | Name and author |
|---|---|
| 1929 | Dinorthis (Plaesiomys) subquadrata occidentalis Ladd p. 402 figs. pl. 5, figs. 7–9 |
| 1949 | Plaesiomys subquadratus occidentalis Wang p. 5 figs. pl. 2d, figs. 1–5. |
| 2013 | Plaesiomys occidentalis Wright and Stigall p. 1120 |
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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.
†Plaesiomys occidentalis Ladd 1929
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. F. Wright and A. L. Stigall 2013 | Small Plaesiomys species with highly biconvex shell in which both dorsal and ventral umbos extending across the hinge line. Shell height large for genus; outline subquadrate, cardinal extremities rounded; costal density high; sulcus depth low, delthryium inclined; ventral interarea highly obtuse; ventral umbo extending significantly over the hinge line; dorsal umbo proximal, opening into a wide (1508) angle. Emended from Ladd (1929). |