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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