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Famatinorthis ponderosus
Taxonomy
Doleroides ponderosus was named by Cooper (1956) [Doleroides ? ponderosus
= Doleroides ? sp. Butts, Virginia Geol. Surv. Bull. 52, pi. 80, figs. 22-24, pl. 81, figs. 34-35, 1942.]. Its type specimen is USNM 98225b, a shell, and it is a 3D body fossil. Its type locality is Porterfield Quarry, 5 miles northeast of Saltville, which is in an Ashbyan reef, buildup or bioherm limestone in the Edinburg Formation of Virginia.
It was recombined as Famatinorthis ponderosus by Neuman (1997).
It was recombined as Famatinorthis ponderosus by Neuman (1997).
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.
†Famatinorthis ponderosus Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Subrectangular in outline, with the width greater than the length; lateral margins broadly rounded, anterior margin truncated ; cardinal extremities obtuse; anterior commissure broadly uniplicate. Surface costellate, costellae narrowly rounded, elevated and with interspaces about equal in width to the costellae, 8 or 9 costellae in 5 mm. at the front margin, some standing out more prominently than others.
Pedicle valve in lateral profile most convex in the posterior half and flattened in the front half. Umbonal region convex, the convexity continued forward to a point not quite at the middle ; posterolateral slopes long and steep. Sulcus broad and shallow, originating at about the middle and occupying slightly more than half the width at the anterior margin. Flanks flat in profile with moderately gentle slopes to the margins. Interarea short, curved, apsacline. Beak incurved. Brachial valve moderately and evenly convex in lateral profile with the maximum curvature at about the middle ; strongly and broadly convex in anterior profile. Umbonal region slightly convex, but anterior to the umbo and throughout the median part to the front margin, the shell is fairly strongly swollen and produces moderately steep slopes to the margins. Interarea short. Pedicle interior with muscle area longer than wide and with narrow diductor impressions ; thickened front margin with 2 short ridges anterior to it. |