A new giant discinoid brachiopod from the Lower Devonian of Algeria

• Autorzy: Mergl M , Massa D.
• Języki publikacji: EN

Abstrakty

EN

A new discinoid brachiopod Gigadiscina gen. nov., with the type species G. lessardi sp. nov., is described from the Lower Devonian (Siegenian) of the Tamesna Basin (South Ahaggar Massif, South Algeria). It is characterised by large size and convexo−planar profile of the shell, with a subcentral pedicle foramen. Micro−ornament is typically discinoid, with small circular pits in radial rows on the post−larval shell surface. Related species of Malvinokaffric Realm origin from South Africa, Falkland Islands, Antarctica, South America, and Libya are reviewed, including the poorly known Discina anomala from the Lower Devonian of Germany. The giant size and convexo−planar shells of these discinoids, remarkably similar to recent limpets, are interpreted as adaptation to a habitat in proximity of sandy and gravel beaches in a high−energy environment. Most likely, the conical dorsal valve suppressed drag in turbulent waters, whereas fixation of shell by large, sucker−like pedicle eliminated peeling from the substrate.

Słowa kluczowe

EN

systematics; new brachiopod; brachiopod; Devonian; Algeria; Lower Devonian; Germany; Discinoidea; Brachiopoda; paleontology

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2005
• Tom: 50
• Numer: 2
• Opis fizyczny: p.397-402,fig.,ref.

Twórcy

autor

Mergl M

• University of West Bohemia, Klatovska 51, 30614 Plzen, Czech Republic

autor

Massa D.

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