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Devonian athyridoid brachiopods with double spiralia

100%

Balinski A.

Acta Palaeontologica Polonica

1995

tom 40

nr 2

129-148

A double-spired athyridoid, morphologically transitional between Early Devonian Helenathyris and Late Devonian Biernatella has been identified in the Givetian of the Holy Cross Mts., Poland. It appears that in the course of evolution between these brachiopods dental plates and cardinal plate atrophied. The biernatellids may have developed a diplospiralium independently of Triassic diplospirellids. They originated either from the Siluro-Devonian lineage represented by Coelospira, Anoplotheca, Bifida and Kayseria or, more likely, they can be derived from their pre-Devonian common ancestors. Biernatellids were probably well adapted to environments with a poor supply of food. Eobiernatella rackii gen. et sp. n., Biernatella ovalis sp. n., and B. lentiformis sp. n. are proposed.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Balinski A.

1 1995

Wyniki wyszukiwania

Devonian athyridoid brachiopods with double spiralia