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Straparollus (Euomphalus) pancakensis
Taxonomy
Straparollus (Euomphalus) pancakensis was named by Mount (1973). Its type specimen is 7101/1, a shell, and it is not a trace fossil. Its type locality is UCR locality 7101. on crest of ridge extending west from first hill north of hill 7865, which is in a Chesterian carbonate limestone in the Moleen Formation of Nevada.
Synonymy list
| Year | Name and author |
|---|---|
| 1973 | Straparollus (Euomphalus) pancakensis Mount pp. 111 - 112 figs. 1A-C |
| 1983 | Straparollus (Euomphalus) pancakensis Gordon and Yochelson pp. 978 - 979 figs. f. 2X-Z |
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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.
†Straparollus (Euomphalus) pancakensis Mount 1973
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. D. Mount 1973 | Shell relatively small; whorls 5; spire slightly elevated; single high, broad, rounded spiral rib medially situated between the upper suture and outer shoulder.
Shell relatively small for the genus, subdiscoidal; spire slightly elevated, the first two whorls flattened; moderately phaneromphalus, umbilicus deep with nearly vertical sides, umbilical angle near 80 degrees. Whorls 5, with moderately rounded angulations on outer-upper and -lower shoulders, outer sides of whorl moderately convex, umbilical profile of whorl weakly convex to flattened. Upper sutures shallow and slightly impressed, passing around the previous whorl just below the upper shoulder. Protoconch unknown. Spiral sculpture consists of a single high, broad, rounded rib between upper suture and angulation on the outer shoulder, width of rib about one third that of whorl, slopes of rib slightly concave. Growth lines orthocline, extending outward to rib on upper whorl, there bending into a sharply defined but shallow sinus; beyond rib growth lines curve slightly backward around whorl to lower suture forming a slightly projecting upper lip over the aperture. | |
| M., Jr. Gordon and E. L. Yochelson 1983 | Straparollus (Euomphalus) aff. pancakensis |
Measurements
No measurements are available
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| Source: g = genus, c = class | |||||
| References: Wagner 1999, Kiessling 2004 | |||||
Age range: Pendleian or 330.90000 to 327.00000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Chesterian | USA (Nevada) | Straparollus pancakensis (type locality: 77065) | |
| Pendleian | USA (Nevada) | Straparollus pancakensis (5523 5525 5526 5528 5530) |