Abstract

The full stratigraphic range of Buccicrenata is here emended to include the Kimmeridgian to Cenomanian and its origin is placed in the Upper Jurassic of the Middle East. Subsequently, the genus spread in the palaeotropics (probably during Aptian time) to inhabit North Africa and Central America from the Venezuela to Texas. Throughout the evolutionary development of the genus, the characteristic long, low and depressed, kidney-shaped chambers are present in the later part at least of the initial planispiral. A new species, Buccicrenata primitiva n.sp., is proposed.

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