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Rafinesquina planulata
Taxonomy
Rafinesquina planulata was named by Cooper (1956). Its type specimen is USNM 123281a, a valve (pedicle valve), and it is a 3D body fossil. Its type locality is 0.6 mile northwest of Linville Station, which is in a Turinian marginal marine sandstone in the Oranda Formation of Virginia.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Rafinesquina planulata Cooper pp. 886 - 887 figs. Plate 266, A, figures 1-4 |
| 1962 | Rafinesquina planulata Williams p. 216 figs. P1. XXII, fig. 4 |
| 2014 | Rafinesquina planulata Candela and Harper pp. Supplement 1 |
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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.
†Rafinesquina planulata Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Of about medium size for the genus, wider than long ; hinge equal to or slightly greater than the midwidth ; sides nearly straight or slightly oblique ; anterior margin broadly rounded; cardinal extremities nearly a right angle or slightly acute. Pedicle valve marked by a median costella stronger than the others; median region from beak to margin marked by several costellae almost as strong as the median one; lateral areas marked by costellae of varying sizes, 1 to 4 of the finer ones alternating with the stronger costellae.
Pedicle valve almost flat in lateral and anterior profile ; beak prominent and umbo slightly and narrowly swollen. Interior with moderately long, slender dental ridges diverging at an angle of about 90° ; muscle area small, heart shaped. Brachial valve very gently concave in lateral profile and with the maximum concavity located near or posterior to the middle ; anterior third deflected slightly toward the brachial valve but nearly flat ; cardinalia delicate ; median ridge and notothyrial platform slightly thickened; cardinal process small and delicate. |