Diagnoza

A flat OZ element with angular profile of the base of the external process. Elements of the symmetry transition series with wide basal cavities; showing a tendency to dismember denticles on poorl y mineralized processes.

Synonims:

Sagittodontina bifurcata n. sp.; KNUPFER, 1967; Noixodontus girardeauensis (SATTERFIELD); MCCRACKEN and BARNES, 1982; Sagittodontina bifurcata KNUPFER; BERGSTROM, 1983; Sagittodontina bifurcata KNUPFER; DZIK, 1990; Sagittodontina robusta KNUPFER; BERGSTROM and MASSA, 1992; lstorinus erectus KNUPFER; BERGSTROM and MASSA, 1992.

Porównanie

The apparatus was reconstructed and the name for it was chosen by BERGSTROM( 1983). The species is represented in Mójcza by an early population and this is probably the reason for the appearance of the rare and poorly preserved elements of the symmetry transition series, still similar to those in S. kielcensis. Only fragments of the sp elements have been found which do not allow any reliable reconstruction.

Autekologia

Występowanie geograficzne

Mójcza, Turingia.

Zasięg czasowy

In Mójcza the species occurs from 1.8 above the bentonite (A. vaerensislsuperbus transition zone) to the top of the massive Mójcza Limestone (A .superbus Zone). Known also from the A. superbus (or A.ordovicicusi Zone of Thuringia, coeval strata in Libya and the topmost bed s
of the Ordovician in the North America n Midcontinent.

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.