Diagnoza

The apparatus of the Namurian Kladognathus is well known owing to statistical studies by Horowitz & Rexroad (1982) and analysis of natural assemblages by Pumell (1993). The genus is well represented both in Todowa Grzęba and Czerna by populations that differ in general appearance of elements but preserve the same apparatus structure. In Todowa Grzęba, elements of Kladognathus show a well developed intercalary denticulation; both processes and the main denticles remain flattened even at late stages of histogeny. The Czerna specimens are robust, with intercalary denticulation weakly developed or missing and with strong and arched cusps of the symmetry transition series. Whether this is a species rank distinction related to difference in age or only an influence of different environmental factors remains to be solved.

The very short third process in sp elements and its lack in oz elements indicates that the Polish species are not conspecific with any of the North American Chesterian species.

Porównanie

Autekologia

Występowanie geograficzne

Zasięg czasowy

Materiały muzealne

Literatura

Dzik, J. 1997. Emergence and succession of Carboniferous conodont and ammonoid communities in the Polish part of the Variscan sea. Acta Palaeontologica Polonica 42, 57-170.