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Sulevorthis bielsteini
Taxonomy
Orthambonites bielsteini was named by Cooper (1956). Its type specimen is USNM 109803a, a valve, and it is a 3D body fossil.
It was recombined as Sulevorthis bielsteini by Jaanusson and Bassett (1993).
It was recombined as Sulevorthis bielsteini by Jaanusson and Bassett (1993).
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Orthambonites bielsteini Cooper pp. 296 - 297 figs. Plate 36, B, figures 9-18 |
| 1993 | Sulevorthis bielsteini Jaanusson and Bassett |
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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.
†Sulevorthis bielsteini Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell of about medium size for the genus, longitudinally semielliptical in outline; length and width equal, or wider than long. Hinge slightly narrower than the greatest shell width which is at about the middle. Lateral margins gently rounded; anterior margin somewhat narrowly rounded. Surface costate, costae 15 to 18 in number, subangular and with interspaces narrower than the width of the costae.
Pedicle valve unevenly convex in lateral profile with the greatest convexity in the posterior half, the front half somewhat flattened. Anterior profile with narrowly rounded summit and steeply sloping sides. Umbo subcarinate and preumbonal region swollen and produced anteriorly as a low fold which becomes nearly obsolete at the front margin. Flanks flat in profile with moderately steep slopes. Anterior slope not so steep as the lateral ones. Interarea short, curved, gently apsacline. Brachial valve with gently convex lateral profile but with the greatest curvature in the umbonal region. Anterior profile a slightly convex arch slightly depressed medially. Sulcus originating on the umbo, expanding anteriorly, shallow throughout its extent and occupying about 4 mm. at the front of the valve. Flanks very gently convex. Cardinal extremities depressed noticeably. Interarea short, anacline. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013 | |||||
Age range: base of the Turinian to the top of the Chatfieldian or 457.30000 to 451.00000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Turinian | USA (Virginia) | Orthambonites bielsteini (164197) | |
| Blackriveran | USA (Pennsylvania) | Orthambonites bielsteini (162391) | |
| Chatfieldian | USA (Virginia) | Orthambonites bielsteini (105205) |