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

Diagnoza

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

Porównanie

The species differs from the older D. forceps in having a gene rally longer cusp of the ne element and from the succeeding D. suberectus in a less simplified morphology of the spand pi elements . 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 pi and hi.

Autekologia

Występowanie geograficzne

Zasięg czasowy

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

Materiały muzealne

Literatura