Weyerognathus triangulus (Voges, 1959) from the Tournaisian Wapnica beds of Dzikowiec in Sudetes.

Apparatus composition of Weyerognathus triangulus.

Diagnoza

Unlike W. inaequalis, the platform of P₁ elements is here always low, with sharp but low ridges. The width of the basal cavity (pit) is also significantly smaller than in the older species of the lineage. Also the rest of the apparatus is less robust than in the ancestral P. inaequalis.

Porównanie

Identification of the species requires a sample of at least a dozen P₁ elements because of a rather wide population variability.There is a gradual change in the basal cavity of the P₁ elements size that makes discrimination of the chronospecies quite arbitrary.  

Autekologia

Występowanie geograficzne

Dzikowiec in the Sudetes, Kowala in the Holy Cross Mts, Hoenetal in the Rhenish Slate Mts., Muhua section in Guizhou Province, China.

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.