Diagnoza

Porównanie

The oldest Dinodus syrnmetry transition series elements in the Dzikowiec and in the Muhua section differ from later elements of the same genus in not having any platform-like ridges at their bases; they thus probably belong to a new species.They are associated with strongly asymmetric P₁ elements that represent a transition between Siphonodella duplicata and Dinodus lobatus. These two species differ rather profoundly in the morphology of the basal surface of the P₁ elements but, if both really have the same apparatus composition, the idea of their evolutionary relationship would receive additional strength. This problem cannot be solved with the available data, so a rather arbitrary choice was taken of matching the robust symmetry transition elements with the robust Siphonodella sp. elements , which are another kind of P₁ element included in this early Dinodus apparatus. These are similar morphologicallly to homologous elements of later Pinacognathus fornicates but with an even wider platform. Only a few specimens have been found and this apparatus reconstruction is, in fact, very weakly substantiated.

Autekologia

Występowanie geograficzne

the Sudetes

Zasięg czasowy

early Tournaisian

Materiały muzealne

ZPAL

Literatura

Dzik, J. 1997. Emergence and succession of Carboniferous conodont and ammonoid communities in the Polish part of the Variscan sea. Acta Palaeontologica Polonica 42, 57-170.