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Cytheridea (Haplocytheridea)
Taxonomy
Cytheridea (Haplocytheridea) was named by Stephenson (1936). It is extant. Its type is Cytheridea (Haplocytheridea) montgomeryensis.
It was assigned to Cytheridea by Stephenson (1936).
It was assigned to Cytheridea by Stephenson (1936).
Species lacking formal opinion data
Cytheridea compressa, Cytheridea habropapillosa, Cytheridea neapolitana, Cytheridea rotundus, Cytheridea rudia, Cytheridea subpyriformis, Haplocytheridea curta, Haplocytheridea eutawensis, Haplocytheridea hazzardi, Haplocytheridea helvetica, Haplocytheridea larosaensis, Haplocytheridea perarcuata, Haplocytheridea retifera, Haplocytheridea trepta
Synonymy list
| Year | Name and author |
|---|---|
| 1936 | Cytheridea (Haplocytheridea) Stephenson p. 700 figs. Plate 94, figures 3, 4, 9; Text-figures 1 g, |
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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.
Subg. Cytheridea (Haplocytheridea) Stephenson 1936
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†Cytheridea (Haplocytheridea) blanpiedi Stephenson 1936
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. B. Stephenson 1936 | This subgenus is very similar to the subgenus Cytheridea in most of its shell characters. The hinge structure, which is simpler than that of the typical Cytheri- dea, presents a ready means of separation. The hinge of the right valve is composed of two elongate, taxodont dental areas, each of which is divided into several cusps by transverse notches. Between these terminal dentitions, along the dor- sal margin and separated from it by an almost imperceptible line, is a uniformly projecting line of equidimensional, mi- nute crenulations. In the left valve the hinge possesses corresponding notched sockets, which are connected by a faint, narrow, longitudinal, crenulate incision that lies immediately below and be- neath the projecting edge of the dorsal margin. |