Rodzaj Prionoceras
Gatunek typowy Opis Diagnosis. — Minute more or less globose conch with closed umbilicus at all stages; internal shell thickenings correspond to external constrictions, expressed mostly on the conch flanks and are regularly distributed, usually three per whorl. Remarks. — Korn (1988, 1994) proposed to separate advanced members of the Prionoceras branch into his genus Mimimitoceras, basing distinctions on slight differences in the shape of aperture and the course of constrictions. Perhaps subgeneric rank would be more appropriate for this taxon. Synonimy Zasięg czasowy 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. |
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