Carboniferous atomodesmids (Mollusca: Bivalvia) from central Patagonia, Argentina

Abstract

A group of bivalves from the Carboniferous rocks of central Patagonia show some resemblances with the Permian family Atomodesmidae. These specimens are known from fragmentary material; some may be in the early stages of the atomodesmids, and kolymiids, and are provisionally assigned to that genus. Four distinct forms are revised; they are Atomodesma amleri n. sp., Aphanaia? sp. indet., Aphanaia precursa n. sp., and Kolymia? sp. indet.