Abstract

The previous literature pertaining to Pseudozaphrentoides verticillatus (Barbour) is briefly reviewed and the species redescribed and reillustrated on the basis of a large and varied assemblage of topotypic specimens from the Upper Pennsylvanian (Virgil Series) of eastern Nebraska. The assemblage contains specimens of three intergradational morphotypes: (1) solitary, completely unbudded corallites, (2) quasi-colonial protocorallites with randomly distributed buds and offsets, and (3) quasi-colonial protocorallites with buds and offsets arranged in verticils and also randomly distributed between verticils.

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