Bucaniid gastropods from the upper Ordovician of Baltica, with a discussion of the Bucaniinae

Three species of bucaniid gastropods from the upper Ordovician of Norway an d Sweden are revised: Euomphalopterus excavatus is redescribed as a species of Phragmolites with very wide umbilici and ornamentation similar to that of Offleya. Three out of five specimens from the original type series of Te mnodiscus lindstroemi remain, representing two different species of two dif ferent genera. The original species name is restricted to a species of Phra gmolites, whereas two specimens are considered conspecific with Megalomphal a? carinata sp. nov., although the high carina, the Raring aperture and the laterally compressed whorls seen in this species an unusual for the genus. The gastropod subfamily Bucaniinae of the family Bucaniidae is here consid ered to comprise nine genera. Placement of Phragmolites in this family is s upported by its deep slit, tangential aperture, transverse growth lines, sp iral and collabral ornamentation and the presence of a longitudinal keel on the base of the whorl.