Diagnoza

Porównanie

The population of Lochriea from Todowa Grząba contains rare specimens developing one or two tubercles at the basal cavity which suggests an advanced position within the main lineage of the genus. In the latest Visean even more elaborate platform structures of the P₁ element develop. Perhaps in the late Visean Lochriea was split into two allopatrically evolving lineages, the more conservative American L commutata and more progressive European L mononodosa leading to prominently ornamented Lochriea multinodosa (Wirth,1967). This trend to develop tuberculation on the basal cone has been traced also in the Visean-Namurian succession of Lochriea populations in the Lublin area.

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.