Diagnoza

Typical S. crenulata specimens occur in the sample Ost-4 in Ostr6wka, together with the  Scaliognathus anchoralis fauna. Most probably they are reworked although the elements in Ostrówka are very well preserved and relatively numerous and in both these aspects differ strongly from other undoubtedly reworked Famennian and early Toumaisian species in the samples. This may have resulted from a difference in matrix of reworked rocks - perhaps S. crenulata occurred originally in unconsolidated clays of the Alum Shale type, while older Siphonodella species come from eroded limestones.

Both Voges (1959) and Klapper (1966) defined the species on the basis of the characteristic outline of the platform. The holotype of the species comes from the same stratum as the type specimen of S. isosticha,that is from the pre-Welden shale of Oklahoma. These are an extremely small juvenile (S. isosticha) and an extremely mature sp element (S. crenulata).

Porównanie

Autekologia

Występowanie geograficzne

Zasięg czasowy

Materiały muzealne

Literatura

Dzik, J. 1997. Emergence and succession of Carboniferous conodont and ammonoid communities in the Polish part of the Variscan sea. Acta Palaeontologica Polonica 42, 57-170.