Diagnoza

Porównanie

At Kowala below the occurrence of Dasbergina kayseri an unnamed species occurs with a wide asymmetric basal cavity resembling that of adult Dasbergina granulosa and with a higly variable tuberculation of the platform that may be almost smooth in juveniles (e.g., Perri and Spalletta 1991, pl. 9: 5). It even seems that in successive samples the basal cone became smaller and more asymmetric, although too few specimens are known to be sure that this is not a case of very wide population variability. A possibility thus emerges that the latest Famennian D. keyseri lineage is an outshoot of Dasbergina, homeomorphic with the early Famennian ancyrognathids.

Autekologia

Występowanie geograficzne

Zasięg czasowy

Materiały muzealne

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.