Diagnoza

From associated Pinacognathus species differs in the strongly concave platform of P₁ elements, giving them a half-cylindrical shape, ornamented with transverse ribs. P. inornatus, P. sp., and P. fornicatus represent a morphocline in this respect, the occlusal surface of the platform (especially in its ventral = anterior part) ranging from a strongly convex to flat. The youngest identified juveniles are elongated, with a thin semicylindrical appearance of the platform and relatively large and fusiform basal cavity (pit). The largest element shows the first stages in development of an extended platform on both sides of the vertical ridges parallel to the blade. This is a process analogous to that so typical for Siphonodella, but the distance between parallel ridges is more than two times larger than in Siphonodella species. 

Porównanie

In the Kowala section, together with advanced Siphonodella, populations similar to P. inomatus occur that are different from those from Dzikowiec in some respects. These are usually robust but rather narrow P₁ elements. The extensions of the platform outside the ridges, so typical for large elements of this species, develop also in the Kowala specimens but the distance between the main row of denticles and ridges seems here significantly smaller. This parallels the differences between some populations of Siphonodella but the taxonomic value of this feature requires additional studies on more numerous and better-preserved material. The basal cavity of the Kowala populations is also more variable in size and shape than those from Dzikowiec.

Autekologia

Występowanie geograficzne

Dzikowiec in the Sudetes, Kowala in the Holy Cross Mts., Muhua section in Guizhou Province of 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.