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Orthonema marvinwelleri
Taxonomy
Orthonema marvinwelleri was named by Knight (1934). Its type specimen is YPM 13944, a shell, and it is not a trace fossil. Its type locality is Locality 6. 200 ft. north of Clayton Rd., 1st street west of Kirkwood-Ferguson Trolly tracks, "Davis Place" subdivision, Clayton, which is in a Desmoinesian carbonate limestone in the Pawnee Formation of Missouri.
Synonymy list
| Year | Name and author |
|---|---|
| 1934 | Orthonema marvinwelleri Knight p. 444–445 figs. pl. 57 f. 3a-c |
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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.
†Orthonema marvinwelleri Knight 1934
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1934 | Small, high-spired, only slightly turreted gastropods with straight sides; whorl-profile slightly shouldered in the region of the two subsutural carinae, which have a narrow concave band between them, concave to nearly flat on the whorl-face between the two median carinae, concave between the two lower carinae, sharply angulated at the lowest, and with a markedly flat base; sutures shallow; columellar and outer lips poorly preserved on the type specimens, but presumably in accord with the requirements of the genus; aperture rhombic; ornamentation four strong revolving carinae, all commonly visible on the whorl-face and arranged in two pairs above and below; the uppermost carina relatively weak, just below the upper suture; the second carina strongly developed and separated from the uppermost by a concave area about one-third as wide as the median band separating it from the equally strong third carina; the fourth carina relatively weak, just above the lower suture, or barely covered by the succeeding whorl, and separated from the third by a concave area comparable to the one between the first and second carinae; color pattern unknown. |
Measurements
No measurements are available
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| Source: c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: Myachkovian or 308.90000 to 307.00000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Desmoinesian | USA (Missouri) | Orthonema marvinwelleri (type locality: 69770) | |
| Myachkovian | Russian Federation (Moscow) | Orthonema marvinwelleri (155822 156078) |