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ActeonsemicingulatusDall, 1927, previously known only by its original description is reassigned to the Pyramidellidae, inOndina, based on the collecting of several new specimens along the coast of Brazil, in the same bathymetry as the type locality. Its shell shape variation is discussed and Odostomia (Evalea) ryclea Dall, 1927 is considered a synonymy. Other Western Atlantic species, previously allocated to other genera are transferred toOndina:AclisstriataVerrill, 1880, Odostomia (Iolaea) hendersoni Bartsch, 1909,EvaleastockiDe Jong & Coomans, 1988 and Odostomia (Evalea) emeryi Bartsch, 1955 based on conchlogical comparison to the revison by Høisæter (2014), from Northeastern Atlantic. The genusEvaleais considered to be absent in the Atlantic Ocean.

Host-parasite relationships for several species of shallow water pyramidellids from Norwegian waters are described. Pomatoceros reefs were found to be substrate for as many as seven species of pyramidellids simultaneously. Circumstantial evidence for Limaria hians as host for Brachystomia rissoides (Hanley) is provided. Odostomia acuta Jeffreys is shown to be an associate of the sabellid, Myxicola infundibulum. Eggmasses of O. acuta were found embedded in the gelatinous walls of the tube of this polychaete. Eggs and recently hatched larvae of O. acuta are described for the first time. The first Norwegian record of Evalea perezi Dautzenberg & Fischer as an associate of Phascolion strombi is given.