Protopanderodus graeai (Hamar, 1966) from the Mójcza Limestone at Mójcza, Holy Cross Mts.

Apparatus of Protopanderodus graeai (Hamar, 1966).

Diagnoza

The M elements with postero-internal surface split by a sharp medial ridge into two concave areas.

Porównanie

Mature elements of the species are much smaller than those of cooccurring species of the genus and have much less sinuous bases. In some samples there is a complete gradual transition between elements of shapes typical for P. rectus and P. graeai. All these specimens have a similar size (that of P. graeai). Above that in the section the typical populations of P. graeai reappear. It is unclear whether this was an influx of a distinct species (perhaps P. robustus sensu Löfgren, 1978), temporal interbreeding between P. graeai and P. rectus or just an irregularity in the course of the evolution.

Autekologia

Występowanie geograficzne

Mójcza. 

Zasięg czasowy

It occurs from 0.7 m below the discontinuity (L. variabilis Zone) and
is quit e common up to 0.5 m above the bentonite. Rare specimens have been found as high as 1.2 m above the bentonite (A . tvaerensis Zone). Occurrences elsewhere are within this time span.

Materiały muzealne

Literatura

Dzik, J. 1994. Conodonts of the Mójcza Limestone. In: J. Dzik, E. Olempska, & A. Pisera. Ordovician carbonate platform of the Holy Cross Mountains. Palaeontologia Polonica 53, 43-128.