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Oxyprora sayrei
Taxonomy
Conocardium sayrei was named by Elias (1957). It is a 3D body fossil. Its type locality is Village of Milo, which is in a Serpukhovian offshore sandstone in the Redoak Hollow Formation of Oklahoma.
It was recombined as Oxyprora sayrei by Hoare (2006) and Wagner (2023).
It was recombined as Oxyprora sayrei by Hoare (2006) and Wagner (2023).
Synonymy list
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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.
†Oxyprora sayrei Elias 1957
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. K. Elias 1957 | This is a small form, 3, or possibly 3.5, mm. long and 13 mm. high. It is reticulate over all surface, in which respect and the triangularity of the lateral outline it is like Conocardium sp. A. It differs from the latter, however, by its strongly curved and very sharp umbonal ridge and absence of wedge-like elevation next to the ridge on the anterior side-the characteristic feature in C. sp. A. The details of sculpture on the anterior side are also different, as described below. The description is based on an external mold of a single right valve, which is almost completely preserved.
Posterior is ornamented by equally prominent and narrow radiating and concentric ridges, which produce a striking reticulate pattern, most conspicuous in the mature, ventral part of the valve. Toward the posterior the concentric ridges are much more densely spaced than the radial ridges, so that here the surface loses its diamond-like reticulate pattern so characteristic of the main part of the posterior of the valve. There are 11 subequal radial ribs posterior to the umbonal ridge, but between the umbonal ridge and the ordinary ridge next to it, two additional ridges are intercalated within a gradually expanding wedge-shaped space this side of the umbonal ridge. On the other posterior side of it the surface of the valve bends sharply inward as it becomes strongly concave, and its surface is covered by wide radial ridges divided by equally wide grooves. The concentric ridges are also present, but are developed prominently only when crossing the radial ridges, but not the grooves where they are faint. Thus the ridges are here transversely nodose. Beyond the sharply grooved concavity just next to the umbonal ridge nine radiating ridges can be counted, the last two being low and short, as they are located in the anterior part transitional to the rostrum. The latter is largely broken off, but probably did not extend very far. | |
| R. D. Hoare 2006 | Oxyprora sayrei (Elias 1957), from the Mississippian Redoak Hollow Formation in Oklahoma, is more elongate [than O. equilaterale], has a more strongly produced rostral face, has fewer body and snout costae, and stronger comarginal lirae forming a reticulate pattern. |