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Thebesia scopulosa
Taxonomy
Thebesia scopulosa was named by Cocks (1982). Its type specimen is PMO 104.027 and is a 3D body fossil.
Synonymy list
| Year | Name and author |
|---|---|
| 1982 | Thebesia scopulosa Cocks p. 778 figs. Plate 84, figs 1- 11 |
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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.
†Thebesia scopulosa Cocks 1982
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. R. M. Cocks 1982 | Exterior. Outline subtriangular, with prominent erect pedicle valve beak with relatively straight sides, which often curve anteriorly to become laterally concave in outline. Small but functional pedicle opening. Variable convexity, from nearly flat to fairly globose. About twelve ribs, difficult to count laterally since they merge with the flat shell sides; ribbing stronger anteriorly from about half valve length, the ribs curving gently antero-laterally. Anterior commissure usually fairly straight, but simple fold and sulcus sometimes weakly developed.
Pedicle valve interior. Teeth supported by well-developed but slender dental plates, subparallel on valve floor, but diverging slightly dorsally. Small transverse pedicle collar weakly developed at approximately the same distance anteriorly as the teeth. Muscle field not impressed. Brachial valve interior. Cardinal process absent. Median septum present to half or two-thirds of the valve length. Prominent socket plates extend anteriorly to form crural bases, underneath which a small crurualium is present posteriorly. Indistinct suboval impressions of adductor muscle scars present on either side of the median septum. |
Measurements
No measurements are available
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| Source: f = family, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Hendy et al. 2009, Aberhan et al. 2004 | |||||
Age range: base of the Hirnantian to the top of the Porkuni or 445.20000 to 443.70000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Porkuni | Norway (Oslo Asker) | Thebesia scopulosa (193293) | |
| Porkuni | Norway (Oslo) | Thebesia scopulosa (157129 159374) | |
| Hirnantian | Norway (Oslo) | Thebesia scopulosa (159519 159520 159523) |