Cyrtospirifer
Extinct genus of brachiopods
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Cyrtospirifer is an extinct genus of brachiopods. The fossils are present in the Middle and Upper Devonian.
| Cyrtospirifer Temporal range: | |
|---|---|
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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 | |
| |
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 hinge line 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 hinge lines and thinner shells.[2]
Description
Cyrtospirifer has a medium to large sized shell, wider than long.
Cyrtospirifer verneuili, 24mm long and about 60mm wide, brachial valve
pedicle valve
lateral
posterior
anterior
Reassigned species
- C. glaucus = Regelia glauca
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