Periodon aculeatus Hadding, 1913 from the Mójcza Limestone.

Apparatus composition of Periodon aculeatus Hadding, 1913.

Diagnoza

Extern al processes in the symmetry transition series and the M elements reduced, with very small denticles.

Porównanie

The species is extremely rare in Mójcza and little can be added to the reconstruction of its apparatus. In the course of the evolution of the Periodon lineage non-inner
processes in the elements of the symmetry transition series gradually disappeared. This can be recognized also within the chronospecies P. aculeatus, in its present mening. Early forms.

Autekologia

Występowanie geograficzne

Cosmopolitan species.

Zasięg czasowy

At Mójcza from 2.2 m to 1.2 below the bentonite (E. robustus - E. lindstroemi Subzones).

Materiały muzealne

ZPAL

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.