Polynodosus nodoundatus (Helms, 1961) from the C. quadrantinodosa Zone at Łagów - P₁ elements.

Polynodosus nodoundatus - P₁ element.

Diagnoza

Blunt apex of widened platform in mature P₁ element tending to develop a depression in the middle, ornamented with irregularly distributed tubercles.

Porównanie

In no sample available to me is the species the only platform-bearing polygnathid and is almost always subordinate in number. Only in sample Md-12 a significant number of P₁ elements have been encountered. They co-occur with robust P₂ elements of morphology indistinguishable from those attributed to P. triphyllatus. This speaks in favor of the proposed generic affiliation of P. nodoundatus. Presumably this is another derivartive of P. confluens.

Autekologia

Występowanie geograficzne

Łagów, Kowala, Miedzianka, and Ostrówka.

Zasięg czasowy

The C. marginifera Zone. 

Materiały muzealne

ZPAL: 276 specimens.

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.