Diagnoza

The sp elements with a weakly separated external area, pi elements flat with a somewhat elongated external tip of the base and a concave posterior side.

Porównanie

The apparatus composition was recognized by BERGSTROMand SWEET ( 1966) . Distinctions between the species and its predecessor, D. basiovalis, are somewhat problematic and additional biometric studies are necessary to clarify the issue. It remains far from clear whether the
Late Ordovician populations from the North American Mid continent are conspecific with the European ones . Somewhat arbitrarily I assign to the species late populations of Drepanoistodus in the Mójcza section, starting from the  discontinuity surface .

Autekologia

Występowanie geograficzne

Holy Cross Mountains.

Zasięg czasowy

Abundant in the Lanvirn and L1andeilo but sparse in the Caradoc.

Materiały muzealne

Literatura