Apparatus composition of Dapsilodus mutatus (Branson & Mehl, 1933) (Dzik 1994.

Dapsilodus mutatus (Branson & Mehl, 1933) from the Mójcza Limestone

Diagnoza

Mature elements with sharp smooth lateral ridges and external margins ornamented with oblique striae .

Porównanie

The apparatus of a closely related Silurian species was described by COOPER ( 1976) .
The type population of Belodus mutatus is in need of revisi n with the application of multielem enttaxonomy. It is not quite certain whether it is conspecific with the European populations traditionally attributed to the same species . The holotype is an ne element, which is diagnostic for the genus leaving no possibility for its species or genus to be identified with Paltodus ? venustus as suggested byMCCRACKEN and BARNES ( 1981).

The sample MA-93 departs from the others containing elements of Dapsilodus in th at its elements are much larger and more prominently ornamented there than in samples below and above. Whether this population represents another species (perhaps D. obliquicostatus) or just a fluctuation in the population dynamics is hard to decide with so limited data available .

Autekologia

Występowanie geograficzne

Mójcza, Międzygórz and Zalesie.

Zasięg czasowy

The range of occurrence of D. mutatus in the Mójcza section is separated from
its possible ancestor, D. viruensis , by a brief gap . The nature of the relationship between them has thus to be recognized in other sections. The species occurs from 1.9 m above the bentonite A.tvaerensis/superbus transition zone) up to the top of the sections

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.