Acta Palaeontologica Polonica

Oxfordian idoceratids (Ammonoidea) and their relation to Perisphinctes Proper

Wojciech Brochwicz-Lewiński and Zdzisław Różak

Acta Palaeontologica Polonica 21 (4), 1976: 373-390

An attempt is made to reconstruct the evolution of idoceratids (Perisphinctidae) during the Oxfordian. The subgenus Nebrodites (Passendorjeria) is supposed to be the ancestor of N. (Mesosimoceras), whilst N. (Enayites) subgen. n. of N. (Nebrodites) and possibly of Idoceras planula group. Both genera appear to be of European origin. Differentiation of Mediterranean and Submediterran.ean perisphinctidae appears questionable.

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