Opis

Diagnosis. — Robust and sharply denticulated elements with clearly terminal growth, P1 element with reduced free blade in adult specimens, S1-2 elements bear short processes, M element with prominent and well denticulated external process.
Remarks. — The morphology of the ancyrognathid apparatus elements is in many respects transitional between that of the Polygnathidae and Palmatolepididae. Like the palmatolepidids, processes of elements of Ancyrognathus are relatively short and with the clearly terminal growth. Mesotaxis is apparently the ancestor of the palmatolepidids although, except for the M element, it has not developed all their diagnostic characters (symmetrical element lacking medial process, lobate platform of P1 elements).
Genera included. — Mesotaxis Klapper &Philip, 1972; Ancyrognathus Branson & Mehl, 1934; Ancyrolepis Ziegler, 1959; Polylophodonta Branson &Mehl, 1934.

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.