Gatunek typowy
Apatognathus varians Branson et Mehl, 1934 from the Famennian of central Missouri.

Opis

Narrow robust processes and sparsely distributed denticles of all elements; closely similar morphology of elements within M, S, and P series.
A succession of Apatognathus species in the Caning Basin is probably an evolutionary series. The change is expressed mostly in the morphology of the M element. In A. provarians from the K. crepida Zone alternating denticles of the same aspect as those in S elements occurred. In A. klapperi from the C. marginifera Zone they formed a prominent fan without alternation of size. One denticle dominated in A. varians from the P. trachytera to D. trigonica Zones. There is also a gradual change in the pattern of denticle alternation. This succession is confirmed by the material from the Holy Cross Mountains although the available material of possible A. klapperi is too limited to determine this species with confidence.

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.