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Strepsodiscus paucivoluta
Taxonomy
Raphistoma paucivoluta was named by Calvin (1892). It is a 3D body fossil.
It was recombined as Pelagiella paucivoluta by Dake and Bridge (1932); it was recombined as Strepsodiscus paucivoluta by Yochelson and Nuelle (1985), Wagner (2023).
It was recombined as Pelagiella paucivoluta by Dake and Bridge (1932); it was recombined as Strepsodiscus paucivoluta by Yochelson and Nuelle (1985), Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1892 | Raphistoma paucivoluta Calvin p. 147 |
| 1932 | Pelagiella paucivoluta Dake and Bridge p. 740 figs. pl. 12 f. 8 |
| 1985 | Strepsodiscus paucivoluta Yochelson and Nuelle pp. 734 – 739 figs. 1-2 |
| 2023 | Strepsodiscus paucivoluta Wagner p. 3228 |
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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.
†Strepsodiscus paucivoluta Calvin 1892
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. L. Yochelson and L. M. Nuelle 1985 | Strongly compressed, lenticular open-coiled gastropods. Early growth stages unknown, but possibly consisting of several closely coiled whorls before developing open coiling. Body whorl wide and very
compressed. Whorl profile of body whorl bilaterally symmetrical, lanceolate; dorsum narrow and almost knifelike in cross section; inner margin relatively sharp, but whorl expanding rapidly and in a step-like manner a short distance inward from margin, then curving outward uniformly to periphery located about a quarter of distance between inner margin and dorsum. Growth lines slightly curved for half of distance of lateral slopes before curving strongly and backwards toward dorsum. |
Measurements
| part | N | mean | |||||
|---|---|---|---|---|---|---|---|
| height | 1 | 7.00 |
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| Source: g = genus, o = order, c = class | |||||
| References: Hendy 2009, Kiessling 2004 | |||||
Age range: base of the Trempealeauan to the top of the Gasconadian or 490.20000 to 477.10000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Trempealeauan | USA (Missouri) | Strepsodiscus paucivoluta (8232 8695) | |
| Gasconadian | USA (Texas) | Pelagiella paucivoluta (56498 56500) |