Fig. 15 q–t
Pleurotoma demosia Dautzenberg & Fischer, 1896 (p. 429, pl. 15, fig. 12).
Pleurotomella (Gymnobela) demosia (Dautzenberg & H. Fischer) — Nordsieck 1968 (p. 183, pl. 31, fig. 95.64).
Pleurotomella (Gymnobela) demosia (Dautzenberg & Fischer, 1896) — Nordsieck 1977 (p. 67, pl. 26, fig. 136).
Pleurotomella demosia (Dautzenberg & Fischer, 1896) — Bouchet & Warén 1980 (p. 39, figs. 91, 226); Beck et al., 2006 (p. 81, bottom fig.).
Pleurotomella demosia (Dautzenberg and Fischer, 1896) — Poppe & Goto 1991 (p. 173, pl. I, fig. 28).
Pleurotomella demosia (Dautzenber y Fischer, 1896)— Giribet & Peñas 1997 (p. 74, figs. 66–68).
Pleurotomella demosia (Dautzenberg & Fischer H., 1896) — Repetto et al. 2005 (p. 215, top left fig.).
Pleurotomella demosia (Dautzenberg y H. Fischer, 1896)— Peñas et al. 2006 (p. 126, figs. 252, 277–278).
Pleurotomella demosia (Dautzenberg & Fisher H., 1896) — Crocetta & Spanu 2008 (p. 72, figs. 3A–B).
Diagnostic characters. Fusiform shell; spire whorls angular; subhorizontal subsutural shelf giving the spire a stepped appearance; oval aperture; short and wide siphonal canal; rather narrow U-shaped anal sinus; 12 to 16 rounded collabral ribs per whorl; superimposed thin spiral cords rapidly increasing in number by intercalation during growth; nodules at the intersections of ribs and cords. Protoconch: conical; 3 whorls; diameter about 530 µm (protoconch I: 310 µm); height about 560 µm; first 1.5 whorls (protoconch I) with spirally connected T-shaped granules forming a square reticulated pattern; subsequent whorls (protoconch II) with an oblique reticulated pattern of sinuous, collabral axial riblets and non-collabral prosocline riblets; the latter riblets absent in the adapical fourth, where only collabral riblets are present; transition to the teleoconch marked at a sinusigera.
Occurrence. Box-corer samples BC71 (11 specimens), BC72 (1). Maximum height: 10 mm.
Distribution and habitat. Pleurotomella demosia is distributed from the northeastern Atlantic southward to the Lusitanic province and the Mediterranean, in the 120–1980 m depth interval (Bouchet & Warén 1980; Poppe & Goto 1991; Bouchet & Taviani 1992). In Sardinian waters, it was found associated with a deep water population of Corallium rubrum (Crocetta & Spanu 2008).
Fossil record. None recorded.