Pinacognnthus fornicatus (Ji, Xiong, & Wu, 1985) from the Tournaisian Wapnica beds of Dzikowiec in Sudetes - P₁ element.

Diagnoza

The elements P₁ are very variable and difficult to determine. Generally, the platform is wide, flat and relatively thin, with a strong occlusal omamentation of the ribs. The margin in some elements is crenulated but in others remains smooth.

Porównanie

There is a remarkable variability in element shapes, some being close to juveniles of Dinodus lobatus. Most of the P₁ elements attributed to this species are strongly angular and bent at the cusp so their basal surface is concave. Some juvenile specimens have their platform linear in profile and may represent yet another related or convergently similar species.

Autekologia

Występowanie geograficzne

Dzikowiec in the Sudetes

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.