Original paper

Middle Famennian (Late Devonian) ammonoids from the Anti-Atlas of Morocco. 1. Prionoceras

Korn, Dieter; Bockwinkel, Jürgen; Ebbighausen, Volker

Abstract

Prionoceras is the most important middle Famennian goniatite genus in the Anti-Atlas of Morocco and the Saoura Valley of Algeria. Based on conch morphology, conch ontogeny, suture line and ornament, nine new species can be separated, which occur in four successive rock intervals. Prionoceras can thus be used as a tool for an independent goniatite-based biozonation, best shown for sections in the Anti-Atlas of Morocco. The new species P. vetus, P. lamellosum, P. takhbtitense, P. subtum, P. jeranense, P. lentis, P. mrakibense, P. ouarouroutense, P. tetrans and P. triens are compared with the time-equivalent Central European species P. divisum and P. frechi. With the addition of these ten new species, the Anti-Atlas of Morocco shows the highest species richness for the genus.

Keywords

ammonoideabiostratigraphylate devonianmoroccomorphometricsontogeny