Cyrtospirifer
Cyrtospirifer verneuili Temporal range: Upper Givetian - Lower Famennian | |
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Cyrtospirifer verneuili from Namur (Belgium), Upper Devonian | |
Scientific classification | |
Kingdom: | Animalia |
Phylum: | Brachiopoda |
Class: | Rhynchonellata |
Order: | Spiriferida |
Family: | Cyrtospiriferidae |
Genus: | Cyrtospirifer Nalivkin, 1924 |
species | |
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Cyrtospirifer is an extinct genus of brachiopoda. The fossils are present in the Middle and Upper Devonian.
Taxonomy
It is likely that Tenticospirifer, that itself appeared during early Givetian, includes the ancestor of Cyrtospirifer. Cyrtospirifer first occurs in western Europe in the Late Givetian. Tenticospirifer has a relatively narrow hingeline and an inflated and thick shell in common with two of the oldest species known, C. verneuiliformis and C. aperturatus. This group dominated during the late Givetian, but was replaced by other species, such as C. syringothyriformis and C. verneuili which have wide hingelines and thinner shells.[1]
Description
Cyrtospirifer has a medium to large sized shell, wider than long.
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Cyrtospirifer verneuili, 24mm long and about 60mm wide, brachial valve
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pedicle valve
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lateral
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posterior
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anterior
Reassigned species
- C. glaucus = Regelia glauca
References
- ↑ Ma, Xueping; Day, Jed (2003). "Revision of Selected North American and Eurasian Late Devonian (Frasnian) species of Cyrtospirifer and Regelia (Brachiopoda)". Journal of Paleontology. 77 (2): 267–292. doi:10.1666/0022-3360(2003)077<0267:rosnaa>2.0.co;2.