Gatunek typowy
Polygnathus lagowiensis Helms et Wolska 1967 from the Łagów Beds at Łagów, the Holy Cross Mountains.

Opis

Platform of P1 elements thin, its surface ornamented with minute tubercles or smooth, lanceolate in outline, low arched M element.
The earliest species of the new genus, P. glaber, resembles some Carboniferous species of Neopolygnathus (e.g., N. purus) in having a flat and completely smooth platform. It is difficult to diagnose this genus in a way allowing its easy separation from such forms. The lineage apparently originated paedomorphically and the P1 elements are secondarily simplified. This change took place much earlier than in the lineage of N. communis and it is unlikely that they are directly related. However, it has to be admitted that ancestry of both lineages remains to be supported with evidence.

Synonimy
Lagovignathus Dzik, 2006

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.