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

Diagnoza

The element P1 shows significant variation in the diagnostic curvature, most elements being laterally bent, symmetrical elements not being rare. The basal cavity is also variable in adult specimens being slightly swollen and //Pseudopolygnathus//-like.

Porównanie

Generally, the basal cavity of P,,1,, elements 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//. The only co-occurring oz elements 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.

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.