Pandorinellina vulgaris (Dzik, 2006) from the P. trachytera Zone at Jabłonna in the Holy Cross Mountains.

Diagnoza

Sharp denticles of P₁ elements of roughly similar height, basal cone with a willow leaf-like contour extending to about two thirds ot the dorsal process, rest of the base narrow.

Porównanie

The species differs from the Frasnian P. insita in the more regular distribution of height of denticles, which close to the dorsal tip are arranged in a gently convex profile. This character makes the species transitional to the Protognathodus and Dasbergina lineages. The associated Alternognathus at non-platform ontogenetic stages shows already a wide spacing in distribution of denticles in the dorsal part of the P₁ element.

The rather large sample Ost-12 shows mature P₁ elements with a robust appearance, the blade being somewhat thickened below denticles, but never developing a true platform. The basal cavity is very narrow. Juvenile specimens with their sharp denticles and flat appearance somewhat resemble Mehlina, as well as juveniles of the associated Mehlina. The main difference at this stage of ontogeny is in a denser and more irregular denticulation in Mehlina transita, which also relatively early developed an incipient platform and inverted basal cavity. Some P₁ specimens of Branmehla may also resemble this species but they show wider and shorter basal cavity and are more or less bent.

Autekologia

Występowanie geograficzne

Łagów;
Jabłonna, Kowala, Miedzianka, Ostrówka, and Dzikowiec.

Zasięg czasowy

C. marginifera Zone;
P. trachytera to P. jugosus Zones.  

Materiały muzealne

ZPAL: 3,244 specimens.

Literatura

Dzik, J. 2006. The Famennian "Golden Age" of conodonts and ammonoids in the Polish part of the Variscan sea. Palaeontologia Polonica 63, 1-359.