Bathyal Mollusca from the cold-water coral biotope of Santa Maria di Leuca (Apulian margin, southern Italy) Author Negri, Mauro Pietro Author Corselli, Cesare text Zootaxa 2016 4186 1 1 97 journal article 10.11646/zootaxa.4186.1.1 5b97cddd-5284-4a6b-8693-898864fb4711 1175-5326 165288 029B675F-776C-4CD6-9992-FA05AEADFA7B Liostomia sp. Fig. 17 p–r Diagnostic characters . Conical-ovate shell; whorls weakly convex; drop-shaped aperture; small umbilical chink; outer surface with sinuous growth lines only. Protoconch: heterostrophic, coaxially immersed (intorted); about 1.25 visible whorls; diameter about 300 µm; surface smooth; transition to the teleoconch marked by a simple, thin lip. Remarks . The present specimens are attributed to the genus Liostomia G. O. Sars, 1878 on the basis of the “ type C” protoconch ( sensu Van Aartsen 1987 ) and the absence of a columellar tooth or fold. Liostomia sp. differs from the related L. clavula ( Lovén, 1846 ) and L. afzelii Warén, 1991 [b], primarily in terms of shell shape (it is distinctly conical) and overall dimensions (it needs one more whorl to reach a comparable heigth). The northern Atlantic L. eburnea (Stimpson, 1851) is also similar, but it has slenderer shell and orthocline growth lines. Occurrence . Box-corer sample BC72 (2 specimens); cores BC04 (1), BC05 (1). Maximum height: 2.5 mm . Distribution and habitat . Liostomia species are parasites (host unknown; cf. Høisaeter 2014 ); they occur in both the northern Atlantic and the Mediterranean, from infralittoral to bathyal depths ( Van Aartsen 1987 ; Van Aartsen et al. 1998 ; Schander et al. 2003 ; Petersen 2004 ; Høisaeter 2009 ).