Diagnoza

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

Porównanie

Mature element s of the species are much smaller than those of cooccur ring species of the genus and have much less sinuous bases. In some samples , the MA-46 being the most conodont-rich of them , there is a complete gradual transition between elements of shapes typic al for P. rectus and P. graeai . All these specimens have 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 LOFGREN 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. 1994a 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.