Diagnoza

The population of Lochriea from Todowa Grząba contains rare specimens developing one or two tubercles at the basal cavity. Such a morphotype has been separated into Lochriea mononodosa (Rhodes, Austin, & Druce 1959). Its type population is represented by a sample collected from the topmost Visean (Gnathodus girtyi collinsoni Zone) at the north of the South Wales Coalfield. As there is hardly a reason to consider denticulated specimens distinct specifically from the rest of the sample I use this name to distinguish them from the main lineage of the genus. In the latest Visean of southern and eastern Europe even more elaborate platform of the sp element structures develop in this region (Nemirovskaya et al.1994). Perhaps in the lateVisean 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 (Skompski 1996)

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.