Colostracon thyrrenicum Smriglio & Mariottini, 1996 Callostracon thyrrenicum Smriglio & Mariottini, 1996 Bathyal Mollusca from the cold-water coral biotope of Santa Maria di Leuca (Apulian margin, southern Italy) Negri, Mauro Pietro Corselli, Cesare Zootaxa 2016 4186 1 1 97 Smriglio & Mariottini, 1996 Smriglio & Mariottini 1996 [151,839,512,538] Gastropoda Acteonidae Callostracon Animalia 80 81 Mollusca species thyrrenicum    Colostracon thyrrenicum Smriglio & Mariottini, 1996(p. 184, figs. 1–5).  Callostracon thyrrenicum Smriglio & Mariottini, 1996— Repetto et al. 2005(p. 254, mid-left fig.); Repetto & Bianco 2012(p. 40, fig. 4).  Diagnostic characters. Ovate shell; drop-shaped aperture; thin parietal callus deep inside the aperture; weak columellar fold; close-set spiral rows of oval pits connected in a chain-like pattern. Protoconch: heterostrophic, submerged, nearly globose; slightly more than 1 visible whorl; diameter about 700 µm; surface smooth; transition to the teleoconch marked by a thin orthocline lip.   Remarks. The specimens fully conform to the types figured by Smriglio & Mariottini (1996). The genus “  Callostracon”, as used by Smriglio & Mariottini (1996)after Nordsieck (1972), is a subsequent incorrect spelling of  ColostraconHamlin, 1884, a Mesozoic genus (cf. Bouchet 2012). The same generic name  Callostraconwas proposed by Repetto & Bianco (2012)for Mediterranean species.  Occurrence. Box-corer samples BC71 (2 specimens), BC72 (1); core BC52 (1). Maximum height: 5 mm.   Distribution and habitat.  Callostracon thyrrenicumis distributed in the central Mediterranean, from the NorthernThyrrenian Sea to Malta, dwelling on coral banks and muddy bottoms at 400–600 mdepth ( Smriglio & Mariottini 1996; Smriglio et al.1998). It has been regarded as an element of the CB bathyal biocoenosis ( Smriglio & Mariottini 1996).  Fossil record.None recorded.