Abstract

Continuity in the distribution of the morphologic characters of terebratulids from two samples has led to the reduction of the long-established taxa phillipsiana and lowensis from specific to infraspecific rank. The taxon buckmaniana, usually considered in Europe as a variety of Lobothyris buckmani, seems to be, in the Middle Atlas, completely unrelated to this species. The morphotypes lowensis, buckmaniana, and phillipsiana are considered as parts of a polytypic species which evolved in the Dogger [Jurassic] and may be related to Goniothyris. The influence of ecologic factors on the modification of the morphotypes and on their distribution in this species is noted.

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