Semiacontiodus cornuformis Sergeeva, 1963 from the Mójcza Limestone.

Diagnoza

The symmetrical element S₀ bears lateral furrows, which separate wide lateral ribs continuously connecting the base with the tip of the cusp and the medial inner rib with a deep medial furrow at its base.

Porównanie

The most characteristic feature of the species is the robustly alate appearance of the S₀ element, which has a regularly triangular contour in medial view. Identifications of other element types are highly tentative because of their morphologic simplicity and the great population variability.

Autekologia

Występowanie geograficzne

Baltic Region, Mójcza in the Holy cross Mts.

Zasięg czasowy

Occurs only below the discontinuity surface of the Mójcza limestone (the oldest undoubted specimens found 0.8 m below of it) while in the Baltic region it is a long ranging species. Its upper range is difficult to determine in the Baltic sections because it is rare above the Llanvirn and the diagnostic symmetrical elements are rarely reported.

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.