Cyrtospirifer_animasensis

<i>Cyrtospirifer</i>

Cyrtospirifer

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Cyrtospirifer is an extinct genus of brachiopods. The fossils are present in the Middle and Upper Devonian.

Quick Facts Scientific classification, Species ...

Taxonomy

Cyrtospirifer sp. with Cyrtina sp. and Eleutherokomma sp.

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

References

  1. [1]
    Rémy Gourvennec (2019). "Silurian-Devonian Spiriferida and Spiriferinida (Brachiopods) from the Tindouf Basin (Algeria)". Palaeontographica Abteilung A. 313 (4–6): 81–149. Bibcode:2019PalAA.313...81G. doi:10.1127/pala/2019/0083.
  2. [2]
    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.


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