Diagnoza

Porównanie

Despite its late geological age, P₁ elements of W. pinnatus in the Dzikowiec section show the basal cavity of size ranges comparable to the much older W. inaequalis. The platform is also not as wide as in W. triangulus but rather triangular, with a tendency in adult specimens to develop an extension at one corner. In this respect this population seems to show, in an incipient form, the features diagnostic of the late Tournaisian W. pinnatus and most probably represents its lineage that immigrated to the area at the beginning of the post-Gattendorfia sea deepening. In thelate Tournaisian  Ostrówka samples the platform shapes of P₁ elements of Weyerognathus show a quite extensive variability, ranging from strongly asymmetrical, narrowly triangular to almost symmetrical and wide. lt remains unknown whether this is a real variability or rather a time averaging effect as a result of reworking of older Tournaisian specimens.

Autekologia

Występowanie geograficzne

Gattendorfia limestone in Dzikowiec in the Sudetes and Scaliognathus anchoralis zone in Ostrówka, Holy Cross Mountains, Poland. 

Zasięg czasowy

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.