Shell Ultrastructure of Mesozoic Craniid Brachiopods from the Ukraine
Year: 2018

Little known Late Jurassic and Early Cretaceous inarticulate craniid brachiopods from the Ukraine are examined for their shell ultrastructure. A new form, ‘Craniscus’ izyumensis n. sp. is described from the Upper Oxfordian (Late Jurassic) of eastern Ukraine, and a new Early Cretaceous (Berriasian) craniid genus,Conocrania, type C. spinacostata from Crimea, is diagnosed, and the type species redescribed in detail. SEM reveals a layer of coarse rhomboidal crystals between the primary layer of acic