"Pandorinellina" laterigranosa (Gedik, 1969) from the Tournaisian Wapnica beds ofDzikowiec.

Apparatus composition of Pandorinellina laterigranosa.

Diagnoza

The P₁ elements of this species show extremely elongated processes with an incipient platform continuing along at least the dorsal process . The true platform never develops, instead, in an adult specimen two strong denticles develop on both sides of the cusp.

Porównanie

In younger samples from Dzikowiec, juveniles do not reach the size at which lateral denticles develop. Whether they are conspecific or just represent the generalised 'Bispathadus' stabilis stock is hard to decide. The associated P₂, syrnmetry transition series, and M elements are of a very generalised polygnathid type. Morphologic distinctions between P₂ elements of Weyerognathus, Pseudopolygnathus, Mehlina, and Falcodus are dfficult to specify and it seems that their population variabilities overlap. Those elements with sfiongly arched contours and relatively short external process may represent Falcodus. The elements  with basal margins of processes merging angularly can be attributed to Weyerognathus. Those with an almost straight profile of the base may represent Pseudopolygnathus. The most difficult to separate are elements of Mehlina and Pandorinellina which are the most generalised and this can be safely done only in samples with a large number of elements of these genera.

Autekologia

Występowanie geograficzne

Carnic Alps, the Sudetes

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.