Pinacognathus sulcatus (Huddle, 1934) from the Tournaisian Wapnica beds of Dzikowiec.

Apparatus composition of Pinacognathus sulcatus.

Diagnoza

Most P₁ elements are laterally bent but symmetrical elements are not rare in the population. The basal cavity is variable, generally it shows the morphology typical of Siphonodella, that is fusiform in shape, but a few very mature specimens are in this respect somewhat transitional to Pseudopolygnathus.

Porównanie

The only co-occurring P₂ elements from Dzikowiec that could belong to the same apparatus are rather robust and variable in morphology. They tend to develop a narrow platform along the dorsal process that gives them a slightly 'notognathella' appearance. Singular recognised elements of the symmetry transition series show some resemblance to elements of the younger Pinacognathus sp. although they are not so specialized morphologically. More numerous oz and, symmetry transition series elements (included in the reconstruction) belonging to the species have been encountered in samples from the Muhua section. In sample just above the marls with concretions marking the top of the Devonian rocks, P₂ elements are rather variable in morphology, only some develop a platform at the robust inner process. Morphologies somewhat similar to those associated with S. duplicata occur there, too. Immediately above in the section, only robust P₂ elements occur, associated with the symmetry transition series elements closely similar to those of Pinacognathus.

Polygnathus gediki Luppold, 1994, co-occurring with P. sulcatus at Hangenberg in the Rhenish Massif, seems to be based on adult P₁ elements of this species.

Autekologia

Występowanie geograficzne

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.