Gatunek typowy
Acontiodus (Semiacontiodus) nogamii MILLER, 1969.

Opis

Diagnosis. - Apparatus weakly differentiated , elements with relatively shallow basal cavities . The symmetric element robust , with strong lateral ridges; asymmetric elements with more or less oval cross sections of their cusps, bearing distally oblique ridges along their inner side .
Remarks. - Staufferella SWEET, THOMPSON et SATTERFIELD, 1975 is a generic name commonly used for Late Ordovician species of the same group. Its type species differs from older ones in having incisions at the base of lateral ribs in the tr elements; if there is really a need to separate Early and Late Ordovician species into distinct genera I suggest the use of this character as diagnostic for Staufferella , species with unmodified ribs being placed in Semiacontiodus .

Synonimy

Zasięg czasowy

Literatura

Dzik, J. 1994a Conodonts of the Mójcza Limestone. In: J. Dzik, E. Olempska, & A. Pisera. Ordovician carbonate platform of the Holy Cross Mountains. Palaeontologia Polonica 53, 43-128.