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Tomiopsis (Ambikella) ovulum
Taxonomy
Tomiopsis ovulum was named by Waterhouse (1971). Its type specimen is GSC 24802 and is a 3D body fossil. Its type locality is GSC 55930, Alaska Highway, which is in an Asselian marine sandstone/siltstone in the Kindle Formation of Canada.
It was recombined as Tomiopsis (Ambikella) ovulum by Waterhouse (1998).
It was recombined as Tomiopsis (Ambikella) ovulum by Waterhouse (1998).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1971 | Tomiopsis ovulum Bamber and Waterhouse figs. Pl 12, figs 12,14 |
| 1971 | Tomiopsis ovulum Waterhouse p. 73 figs. Pl 15, figs 1-15; pl 16, figs 1-15; pl 17, figs 3,6,7,8,11,12; text-figs 3-7 |
| 1996 | Tomiopsis ovulum Shi and Waterhouse p. 145 figs. Pl 28, figs 6-8 |
| 1998 | Tomiopsis (Ambikella) ovulum Waterhouse p. 9 |
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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.
†Tomiopsis (Ambikella) ovulum Waterhouse 1971
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Waterhouse 1971 | Subglobular shells with shallow sulcus and subdued fold commencing at umbones, sulcus bordered by low narrow plicae, and bearing two subplicae which merge anteriorly into median swelling, fold not sulcate, plicae of four to five pairs, low and narrow; micro-ornament fine. Adminicula of moderate length, close-set; tabellae long, spaced moderately far apart. |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 4 | 26.2 | 20.7 | 29.3 | 27.9 | 3.89 | |
| valve height | 1 | 25.6 | - | - | - | - |
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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 Asselian to the top of the Artinskian or 298.90000 to 283.30000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Asselian | Canada (British Columbia) | Tomiopsis ovulum (type locality: 52140) Tomiopsis sp. (101730) | |
| Sakmarian | Canada (Yukon) | Tomiopsis ovulum (117677) | |
| Artinskian | Canada (Yukon) | Tomiopsis ovulum (117694) |