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Vanuxemia waynesvillensis
Taxonomy
Vanuxemia waynesvillensis was named by Frey (1980). Its type specimen is USNM 250176, a shell, and it is not a trace fossil. Its type locality is Roadcut along US 42, which is in a Richmondian deep subtidal shelf claystone in the Waynesville Formation of Ohio.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1980 | Vanuxemia waynesvillensis Frey pp. 740 – 744 figs. pl. 1 f. 1-6 |
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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.
†Vanuxemia waynesvillensis Frey 1980
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. C. Frey 1980 | Beaks nearly terminal; anterior shell margin conspicuously flattened; one to three anterior teeth per valve, located posterior to anterior muscle platform, and two or three posterior teeth per valve.
The shell is ventricose, obliquely ovate with a reduced, strongly flattened, erect anterior end which has a shallow dorsal byssal sinus. The umbones are prominent with nearly terminal, incurved beaks. The posterior end is broadly rounded. The external ornament consists of variably-spaced, strong, concentric growth lines. The broad, finely-striated ligamental area extends the length of the shell. There are one to three finely-crenulated anterior teeth per valve, located below the beaks and posterior to the anterior muscle platform. The posterior dentition consists of two or three teeth located posterior-laterally, just below the ligamental area. The anterior adductor scar is well defined, situated on a raised muscle platform below and anterior to the anterior dentition. The ventral margin of the platform is marked by a variably-developed cleft or myophoric notch. The muscle platform is separated from the anterior shell margin by a low ridge. |