Drepanoistodus basiovalis (Sergeeva, 1963) from the Mójcza Limestone.

Apparatus of Drepanoistodus basiovalis (Sergeeva, 1963)

Diagnoza

The P elements with an angulation at the anterior flank separating an external triangular area, which slightly deviates backward from the plane of the element, the S₁ elements with a sinuous profile of the base, the M elements with their cusps significantly longer than the base.

Porównanie

The species differs from the older D. forceps in having a generally longer cusp of the M element and from the succeeding D. suberectus in a less simplified morphology of the P and S₁ element . Elements of Drepanoistodus are extremely variable within samples but there seem to be five discrete types of elements with possibly a sixth one morphologically intermediate between these interpreted here as S₁ and S_2-4.

Autekologia

Występowanie geograficzne

Zasięg czasowy

Abundant below the discontinuity surface (L. variabills Zone) at Mójcza.

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.