Gatunek typowy
Mitrellataxis chevronella Chauff et Price, 1980 from the Maple Mill Shale at Kalona Clay Pit, Iowa; Scaphignathus velifer Zone

Opis

Robust coniform elements with shallow or inverted basal cavities of circular outline.
The Famennian ‘simple cones’ are of three kinds: some are ornamented with prominent longitudinal ribs (typical Mitrellataxis), others show a virtually smooth surface (Jablonnodus), yet others developed irregular tuberculation with ameloblasts imprints, thus developing a kind of icrion (Fungulodus-Conchodontus). A fine striation occurs also in robust icriodontid denticles although there seems to be a morphologic gap between them and Mitrellataxis. A similar gap separates smooth icriodontid denticles and elements of M. circularis, resembling rather denticles of robust prioniodinids. Mitrellataxis conoidalis may be the connecting link between robust coniform elements of Icriodus and more derived species of its genus; this is the sole reason why it is classified among the Prioniodontida.

Synonimy

Zasięg czasowy

Famennian

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.