Mathilda coronata Monterosato, 1875

Negri, Mauro Pietro & Corselli, Cesare, 2016, Bathyal Mollusca from the cold-water coral biotope of Santa Maria di Leuca (Apulian margin, southern Italy), Zootaxa 4186 (1), pp. 1-97 : 76

Mathilda coronata Monterosato, 1875

Fig. 17 d–g

Mathilda coronata Monterosato, 1875 [b] (p. 12).

Mathilda coronata, Monterosato—Kobelt 1905 (p. 68).

Mathilda coronata Monterosato, 1875 —Sabelli & Spada 1978[a] (p. 1, fig. 4); Repetto et al. 2005 (p. 226, mid right fig.); Peñas et al. 2006 (figs. 253, 293).

Diagnostic characters. Turreted shell; angular teleoconch whorls; rounded aperture; numerous axial riblets crossed by four spiral cords forming nodules at the intersections; spiral cord 3 (from adapical) strongest, forming pronounced angulation and periphery; non-nodulose spirals on base. Protoconch: heterostrophic, heliciform, transaxial; 2.75 whorls; diameter about 440 µm; surface smooth; transition to the teleoconch marked by a very thin varix.

Occurrence. Box-corer samples BC05 (1 specimen), BC66 (1), BC67 (2), BC71 (11), BC72 (4); core BC51 (1). Maximum height: 8 mm.

Distribution and habitat. Mathilda coronata appears to be endemic of the Mediterranean Sea, where it is found on bathyal soft bottoms, often in the vicinity of deep water coral banks ( Kobelt 1905; Smriglio et al. 2007).

Fossil record. None recorded.

Figures

FIGURE 17. a – c: Mathilda cochlaeformis Brugnone, 1873, samples BC 71 (a) and BC 66 (b – c), scale bars: 2 mm (a), 0.2 mm (b – c, protoconch); d – g: Mathilda coronata Monterosato, 1875, sample BC 71, scale bars: 2 mm (d), 0.2 mm (e – g, protoconch); h – j: Eulimella scillae (Scacchi, 1835), sample BC 72, scale bars: 1 mm (h), 0.2 mm (i – j, protoconch); k – m: Eulimella unifasciata (Forbes, 1844), sample BC 72, scale bars: 2 mm (k), 0.2 mm (l – m, protoconch); n – o: Chrysallida flexuosa (Monterosato, 1874), sample BC 67, scale bars: 0.5 mm (n), 0.2 mm (o, protoconch); p – r: Liostomia sp., sample BC 72, scale bars: 1 mm (p), 0.2 mm (q – r, protoconch).