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Macrocoelia rotunda
Taxonomy
Macrocoelia rotunda was named by Cooper (1956) [= Rafinesquina cf. R. champlainensis Butts (not Raymond), Virginia Geol. Surv. Bull. 52, p. 8s, pi. 86, figs. 5-7, 1942.]. Its type specimen is USNM 98200a, a shell, and it is a 3D body fossil.
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Macrocoelia rotunda Cooper pp. 899 - 900 figs. Plate 234, A, figures 1-5 |
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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.
†Macrocoelia rotunda Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell large for the genus, attaining a length of more than 2 inches ; slightly wider than long ; sides gently rounded ; subparallel ; hinge shorter or wider than the midwidth ; cardinal extremities slightly auriculate. Anterior margin narrowly rounded. Costellae moderately strong, well differentiated into coarse and fine.
Pedicle valve strongly convex in lateral profile and with the maximum convexity slightly anterior to the middle; anterior profile strongly domed, with steep sides ; beak small, umbo swollen ; median region strongly inflated ; anterior slope steep. Interarea moderately long and curved. Pseudodeltidium nearly obsolete. Brachial valve most deeply concave in the median region. Sides and anterior sloping steeply toward the middle; cardinal extremities deflected toward the pedicle valve. |