Semiacontiodus longicostatus (Drygant, 1974) from the Mójcza Limestone.

Apparatus composition of Semiacontiodus longicostatus (Drygant, 1974)

Diagnoza

The symmetrical S₀ element with a subsquare cross section at the base of the cusp and with a wide medial furrow.

Porównanie

From its presumed ancestor, S. cornuformis, the species differs in the non-alate appearence of the S₀ element and in more prominent ornamentation at the inner side of the cusp base.

Autekologia

Występowanie geograficzne

Holy Cross Mountains and Volhynia, Jamtland in Sweden

Zasięg czasowy

From the Lasnamagian to Kukrusean, probably present also in older (latest Kundan and Aserian) beds. In Mójcza it occurs from the discontinuty surface (E. reclinatus or E. robustus Subzone) up to about 2.0 m above the bentonite (A. tvaerensis/superbus transition zone).

Materiały muzealne

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.