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Dactylogonia geniculata
Taxonomy
Dactylogonia geniculata was named by Ulrich and Cooper (1942).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1942 | Dactylogonia geniculata Ulrich and Cooper |
| 1956 | Dactylogonia geniculata Cooper pp. 827 - 828 figs. Plate 216, D, figures 14-30; plate 217, M, figures 38, 39; plate 21S, B, figures 4-7 ; plate 219, E, |
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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.
†Dactylogonia geniculata Ulrich and Cooper 1942
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell wider than long with acute cardinal extremities; profile concavo-convex; lateral margins sloping medially; anterior margin broadly convex to subtruncate Surface covered by closely crowded costellae of unequal size, S to 9 of the smaller costellae arranged into groups by the scattered larger ones.
Pedicle valve with the posterior 9 mm. nearly flat but the anterior narrowly convex; geniculation takes place at about 9 mm. anterior to the beak and the angle of geniculation is about 9S o. Beak erect, the umbo inconspicuous but slightly swollen. Geniculated part narrowly convex; front slope slightly convex in profile and steep. |