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Allodesma
Taxonomy
Allodesma was named by Ulrich (1894) [Sepkoski's age data: O Cara-m]. It is not extant.
It was assigned to Cycloconchidae by Ulrich (1894); to Modiomorphoida by Sepkoski (2002); and to Allodesmatidae by Vokes (1980), Bouchet et al. (2010).
It was assigned to Cycloconchidae by Ulrich (1894); to Modiomorphoida by Sepkoski (2002); and to Allodesmatidae by Vokes (1980), Bouchet et al. (2010).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1894 | Allodesma Ulrich p. 617 |
| 1980 | Allodesma Vokes p. 71 |
| 2002 | Allodesma Sepkoski |
| 2010 | Allodesma Bouchet et al. |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. O. Ulrich 1894 | Shell small, transversely elongate-elliptical, moderately convex; beaks anterior, small, surface with concentric lines of growth. Hinge apparently with one or two long posterior lateral teeth in each valve, two cardinal teeth in the right valve, and only one in the left; anterior laterals short or wanting. Anterior adductor scar distinct, large, ovate, margined on the inner side by a strong curved ridge extending downward fi'om the hinge at a point immediately in front of the beaks. Just above the adductor impressions and in front of the ridge, a small pedal muscle scar. Posterior adductor impression faint, larger than the anterior, of rounded form, situated near the middle of the posterior cardinal slope. Pallial line simple. |
Measurements
No measurements are available
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| Source: c = class | |||||
| Reference: Aberhan et al. 2004 | |||||
Age range: base of the Longvillian to the top of the Hirnantian or 457.20000 to 443.10000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Sandbian - Katian | Norway (Oppland) | A. elegantula (194681) | |
| Shermanian | USA (Minnesota, Illinois, Iowa) | A. sp. (23552) | |
| Shermanian | USA (Minnesota) | A. subellipticum (174070) | |
| Longvillian - Marshbrookian | China (ShanXi) | A. sp. (7918) | |
| Hirnantian | Sweden (Jamtland) | A. sp. (153332) |