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ACROTRETACEA [1 record]

Record 1 2003-07-22

English

Subject field(s)
  • Paleontology
DEF

A family of Cambrian and Ordovician inarticulate brachiopods of the suborder Acrotretidina.

OBS

[Inarticulate brachiopods belonging to the] superfamily Acrotretacea ... [are characterized by a] pedicle valve [which is] commonly conical to subconical, more rarely convex, [a] pseudointerarea [is] usually present; [the] pedicle opening [is] typically a foramen at or slightly posterior to [the] beak, less commonly an open triangular delthyrium; [the] brachial valve [is] usually with [a] marginal beak, more rarely [a] low cone ...; propareas [are] variably developed; [a] dorsal median ridge or septum [is] usually present ... Lower Cambrian-Devonian.

French

Domaine(s)
  • Paléontologie
OBS

[Les brachiopodes inarticulés appartenant à la] super-famille des Acrotretacea [...] [ont une] Forme circulaire de contour et [un] profil allant de conique à déprimé. [L']orifice pédonculaire [est] simple, circulaire, passant à travers l'umbo de la valve ventrale en arrière du protegulum. Cambrien-Silurien.

Spanish

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