Teredo dorsalis Turton, 1819 Xylophaga dorsalis Xylophaga dorsalis Turton—Jeffreys 1882 Xylophaga dorsalis dorsalis ( Turton, 1819 ) Xylophaga dorsalis (Turton) Xylophaga dorsalis ( Turton, 1819 ) 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 Turton, 1819 Turton 1819 [151,569,293,319] Bivalvia Pholadidae Xylophaga Animalia Myoida 42 43 Mollusca species dorsalis    Teredo dorsalis Turton, 1819(p. 185).   Xylophaga dorsalis— Turton 1822(pp. 16, 253; pl. 2, figs. 4–5).    Xylophaga dorsalisTurton—Jeffreys 1882[a] (p. 947);  Hidalgo1917(p. 744); Tebble 1966(p. 187, text-fig. 100c).   Xylophaga dorsalis dorsalis( Turton, 1819)— Nordsieck 1969(p. 153, pl. 22, fig. 87.30).   Xylophaga dorsalis(Turton)— Di Geronimo & Panetta 1973(p. 110).    Xylophaga dorsalis( Turton, 1819)— Cossignani et al.1992(figs. 397–397A); Poppe & Goto, 1993(p. 132, pl. 25, fig. 7); Giribet & Peñas 1997(fig. 108); Repetto et al.2005(p. 349, mid left fig.); Oliver et al., 2016(online resource).  Diagnostic characters. Subrounded shell; segmented internal umbonal-ventral ridge ending in a rounded condyle; hook-like denticle on the ventral part of the umbonal reflection; median shallow radial depression bordered backward by a strong radial rib; finely granulose commarginal ribs on the anterior half, abruptly curved downward at the anterior one-fourth. Prodissoconch: shell type ST-2A; length about 270 µm; roundish outline; convex profile; P-1 not visible (but smaller than 100 µm); P-2 with regular low commarginal cordlets throughout and fine radials on the abapical stages; transition to the nepioconch rather well marked.   Occurrence. Box-corer samples BC66 (3 specimens), BC72 (10); cores BC05 (5), BC21 (1), BC51 (1), BC72 (3). Maximum length: about 5 mm.   Distribution and habitat. The species is reported to be widespread in the Atlantic (Lofoten to the Azores) and Mediterranean, being a wood-boring eurybathic element distributed from intertidal to bathyal depths ( Nordsieck 1969; Di Geronimo & Panetta 1973; Di Geronimo et al.2001; Oliver et al.2016). It was regarded as accidental in VP (bathyal mud) biocoenosis ( Pérès & Picard 1964).  Fossil record.Miocene to Recent of the Mediterranean ( Di Geronimo & Bellagamba 1985; Monegatti & Raffi 2001). 1324948216 [151,1318,461,483] Hidalgo 42 43 1 Hidalgo 1324948203 Goto 42 43 1 Goto