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Pionodema minuscula
Taxonomy
Pionodema minuscula was named by Willard (1928). Its type specimen is MCZ 8610, a shell, and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1928 | Pionodema minuscula Willard p. 275 figs. pl. 2, fig. 3 |
| 1956 | Pionodema minuscula Cooper p. 991 figs. Plate 155, A, figures i-io; plate ISS, G, figures 32-42 |
| 1957 | Pionodema miniscula Allen and Lester |
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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.
†Pionodema minuscula Willard 1928
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Small for the genus, slightly wider than long ; hinge narrow ; cardinal extremities obtuse ; sides and anterior margin gently rounded ; anterior commissure broadly uniplicate in adults. Costellae fine, crowded, unequal in size, those on the fold and sulcus stronger than those on the flanks. Costellae in fold and sulcus 2 or 3 in I mm. ; on the flanks costellae number 4, rarely 5, to the millimeter at the front margin.
Pedicle valve with uneven lateral profile, the posterior part convex but the anterior quarter somewhat flattened ; anterior profile gently and broadly convex ; beak slightly curved, somewhat erect ; umbo somewhat narrowly swollen ; median region convex ; lateral slopes short and fairly steep. Anterior quarter depressed gently to form a shallow sulcus. Interarea gently curved, apsacline. Brachial valve about equal to the pedicle valve in depth, fairly evenly and moderately convex in lateral profile. Anterior profile broadly and moderately convex. Umbo with a small sulcus ; umbo and median region longitudinally swollen to form a poorly defined fold. Lateral slopes moderately long and gentle. Interior with small cardinal process and widely spaced, subparallel brachiophore supporting plates. |