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Colaptomena leptostrophoidea
Taxonomy
Colaptomena leptostrophoidea was named by Cooper (1956). Its type specimen is USNM 117761 and is a 3D body fossil. It is the type species of Colaptomena.
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Colaptomena leptostrophoidea Cooper p. 890 figs. Plate 267, A, figures 1-10 |
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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.
†Colaptomena leptostrophoidea Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell large, subquadrate to subrectangular in outline ; slightly wider than long ; hinge variable, wider than the midwidth in the young, narrower than midwidth in old adults ; cardinal extremities slightly alate and pointed to rounded obtuse ; sides subparallel ; anterior margin somewhat narrowly rounded. Pedicle valve more strongly costellate than the brachial valve, 2 large and 2 small costellae at the front margin; brachial valve with 5 costellae in 1 mm.
Pedicle valve perceptibly convex in lateral profile and with the umbonal region the most convex part ; anterior profile broadly and gently convex, Umbonal region gently swollen, the swelling continuing noticeably to about the middle; remainder of valve nearly flat. Interarea short, only slightly longer than the brachial one. Brachial valve with umbo concave and posterior median region gently concave, rest of valve gently concave or nearly flat. |