Acta Palaeontologica Polonica

On the parasphenoid of the Brachythoraci

Julian Kulczycki

Acta Palaeontologica Polonica 01 (2), 1956: 103-111

A description is given of the Brachythoraci parasphenoid as compared with the corresponding structure in Acanthaspidians and some Crossopterygians (Porolspidae) and with the Acanthodian anterior-basal.

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