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 Entalina tetragona ( Brocchi, 1814 ) Fig. 11 d–f Dentalium tetragonum Brocchi, 1814 (p. 627, pl. 15, fig. 26). Entalina tetragona (Brocchi) — Caprotti 1961 (p. 356, pl. 20, figs. 7–8); Di Geronimo 1974 (p. 153); Di Geronimo & Li Gioi 1980 (pl. 1, fig. 7; pl. 3, fig. 6). Entalina tetragona ( Brocchi, 1814 ) — Robba 1968 (p. 505, pl. 39, fig. 6); Caprotti 1979 (p. 251, pl. 13, figs. 4–8); Pavia 1991 (p. 132, pl. 8, figs. 7–8); Barash & Danin 1992 (p. 229, fig. 233); Cossignani et al. 1992 (fig. 411); Poppe & Goto 1993 (p. 35, pl. 1, fig. 12); Petersen 2004 (p. 61, fig. 45); Repetto et al. 2005 (p. 358, bottom left fig.). FIGURE 11. a–c : Antalis agilis (Sars M. in Sars G.O., 1872) , samples BC04 (a) and BC72 (b–c), scale bars: 5 mm (a), 0.2 mm (b, posterior aperture), 1 mm (c, anterior aperture); d–f : Entalina tetragona (Brocchi, 1814) , sample BC72, scale bars: 2 mm (d), 0.1 mm (e, posterior aperture), 0.5 mm (f, anterior aperture); g : Cadulus subfusiformis (Sars M., 1865) , sample BC52, scale bar 0.5 mm; h–k : Propilidium exiguum (Thompson, 1844) , sample BC66, scale bars: 1 mm (h–i), 0.1 mm (j–k, protoconch); l– n : Emarginula adriatica (Costa O.G., 1830), sample BC72, scale bars: 2 mm (l–m), 0.1 mm (n, protoconch); o–q : Emarginula multistriata Jeffreys, 1882 , sample BC70, scale bars: 1 mm (o–p), 0.1 mm (q, protoconch); r–t : Emarginula tenera Locard, 1982 , sample BC71, scale bars: 1 mm (r–s), 0.1 mm (t, protoconch). Diagnostic characters . Rather thin, regularly curved shell; anal aperture roundly quadrangular; foot aperture roundly pentagonal; four distinct longitudinal ribs on younger stages; additional slightly weaker rib developing soon after dorsally; several fine riblets appearing on older stages. Larval shell: not available. Occurrence . Box-corer samples BC04 (8 specimens), BC05 (2), BC72 (6); cores BC04 (7), BC05 (5), BC21 (9), BC51 (4), BC72 (1). Maximum length: 8.5 mm . Distribution and habitat . Entalina tetragona ranges from Norway to the Caribbean, Cape Verde and the Mediterranean, including the Levantine basin; it was regarded as an exclusive characteristic element of VP (bathyal mud) biocoenosis dwelling on muddy bottoms at bathyal depths, being more frequent in the 400–600 m bathymetric interval (Di Geronimo 1979[a]; Di Geronimo & Bellagamba 1985 ; Barash & Danin 1992 ; Poppe & Goto 1993 ; Pons-Moyà & Pons 1999 ; Galil 2004 ). In the Santa Maria di Leuca CWC biotope, it was regarded as common in Gryphus-Isidella and mollusk mud thanatofacies (Rosso et al. 2010). Fossil record. The species appeared during Upper Miocene (Tortonian), being among the few still surviving Miocene taxa ( Caprotti 1979 ); records are from Miocene of Italy, Poland , Hungary and Vienna basin; Pliocene of Italy ; Pleistocene of Denmark , central and southern Italy ( Monterosato 1872 ; Robba 1968 ; Caprotti 1979 ; Di Geronimo & Li Gioi 1980 ; Di Geronimo & Bellagamba 1985 ; Pavia 1991 ; Di Geronimo & La Perna 1997; Petersen 2004 ; Di Geronimo et al. 2005 ).