Redescription and reassignment of Ondina semicingulata to the Pyramidellidae, with review of the occurrence of genus Evalea in the Western Atlantic (Gastropoda)

Abstract

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.

Pyramidellidae (Gastropoda: Heterobranchia) from the End of the World

“…Pyramidellidae is one of the most diversified families of gastropods. In the last years, several studies performed in different areas, have greatly improved the knowledge on this family (e.g., Schander, 1994;van Aartsen et al, 1998van Aartsen et al, , 2000Lygre et al, 2011;Pimenta et al, 2008Pimenta et al, , 2018Høisaeter, 2014;and references therein). These studies frequently showed that numerous pyramidellid species are found co-existing in particular, even small, geographic areas, as well as the fact that a high number of species have remained undescribed until recent times, a phenomenon particularly noticeable when considering the fauna from South America (Pimenta, 2012;Pimenta & Absalão, 2001, 2004Pimenta et al, 2008Pimenta et al, , 2009Güller & Zelaya, 2019).…”