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Pensarnia
Taxonomy
Pensarnia was named by Cope (1996) [Sepkoski's age data: O Aren-l Sepkoski's reference number: 1238]. It is not extant.
It was assigned to Praenuculidae by Cope (1996); and to Nuculoida by Sepkoski (2002).
It was assigned to Praenuculidae by Cope (1996); and to Nuculoida by Sepkoski (2002).
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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.
G. †Pensarnia Cope 1996
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. C. W. Cope 1996 | Praenuculid of rounded trapezoidal outline with strongly inftated valves of variable
length and prominent umbones at anterior. Posterior part of dorsal margin and anterior ventral margin approximately parallel. Exterior with fine growth increments, occasional stronger increments in some. Taxodont dentition continuous beneath umbones; anteriormost t的th largest; those beneath umbones extremely small; posterior teeth largely equal in siz旭posterior to umbones; 20-32 straight or chevron-shaped teeth. Hinge-line straight as far as posterior, where it follows curve of dorsal margin of valves. Anterior adductor circular, deeply inserted and with prominent triangular pedal retractor scar on dorsal side; posterior adductor larger, more shallowly inserted, subtrapezoidal. Umbones strongly curved over hinge-plate. |