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Ptychopteria pusilla
Taxonomy
Ptychopteria pusilla was named by Hoare (1993). Its type specimen is USNM 314063, a shell, and it is a 3D body fossil. Its type locality is Bramwell Member, Bluestone Formation, which is in a Serpukhovian transition zone/lower shoreface shale/siltstone in the Bluestone Formation of West Virginia.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1993 | Ptychopteria pusilla Hoare p. 382 figs. 3.20 - 3.22 |
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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.
†Ptychopteria pusilla Hoare 1993
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. D. Hoare 1993 | Ptychopteria with hingeline forming greatest valve length; large posterior wing and relatively large anterior auricle.
Small Ptychopteria with long, straight hingeline forming greatest length of valve; beaks low, located just anterior to midlength; large posterior wing forming angle of 60? with hingeline; smaller but relatively large anterior auricle set off from shell body by narrow sulcus; anterior margin abruptly rounded into hingeline; ventral margin broadly rounded; surface orna-mentation of relatively coarse, comarginal wrinkles which reflect anterior sulcus; wrinkles less strongly developed on posterior wing; no trace of radial ornamentation present. |