Dasbergina stabilis (Branson & Mehl, 1934) from the P. jugosus Zone at Jabłonna and Ostrówka in the Holy Cross Mountains.

Apparatus composition of Dasbergina stabilis.

Diagnoza

P₁ element lacking platform, almost flat cavity of the basal cone with eye-drop outline, continuing to the dorsal tip of the blade.

Porównanie

The basal cavity varies from being virtually flat to distinctly conical. Specimens with very flat base differ from those of Pandorinellina vulgaris in their much lower blade and a tendency to develop an incipient platform of low elevation continuing to the tip of the element. From associated juvenile specimens of Dasbergina micropunctata such elements differ in having their base (and ‘platform’) gradually narrowing to the tip while in D. micropuntata the base has a pear-like outline and terminates significantly in front of the element tip.

The oldest specimens of D. stabilis in the densely sampled part of the Kowala section have been found in sample Ko-187. Unfortunately specimens classified in P. vulgaris from the sample immediately below are fragmentary, hampering biometrical presentation of the change.

Autekologia

Występowanie geograficzne

Jabłonna, Ostrówka, Kowala, and Miedzianka, the Holy Cross Mountains, and Dzikowiec, the Sudetes.

Zasięg czasowy

P. trachytera to D. trigonica Zones. 

Materiały muzealne

ZPAL: 4,491 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.