Mikro

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 : 56

Mikro ? sp.

Fig. 12 k–m

Diagnostic characters. Low-spired shell; large oval aperture; reflexed basal and parietal lips; deep and moderately narrow umbilicus; smooth outer surface except for two distinct and some faint subsutural spiral lirae on the first teleoconch whorl. Protoconch: planispiral; 1 whorl; diameter about 100 µm; dense minute granules on the abaxial half (adaxial part somewhat eroded); transition to the teleoconch marked by a barely visible thin lip.

Remarks. This little “skeneimorph” species is provisionally attributed to the genus Mikro Warén, 1996 . Mikro giustii (Bogi & Nofroni, 1989) , the other known Mediterranean species of the genus, differs in having a more globose shell with a comparatively higher spire.

Occurrence. Cores BC04 (1 specimen), BC05 (17), BC21 (1), BC51 (1), BC52 (4). Maximum height: 0.7 mm.

Distribution and habitat. The species of the present genus are bathyal elements; Mikro globulus Warén, 1996 is distributed in Iceland waters in the 200–1100 m depth interval, while M. giustii is reported as occurring in the Mediterranean only ( Warén 1996).

Figures

FIGURE 12. a – c: Anatoma aspera (Philippi, 1844), sample BC 71, scale bars: 1 mm (a – b), 0.1 mm (c, protoconch); d: Danilia tinei (Calcara, 1839), sample BC 72, scale bar 5 mm; e – g: Cirsonella romettensis (Granata – Grillo, 1877), sample BC 67, scale bars: 1 mm (e – f), 0.1 mm (g, protoconch); h – j: Putzeysia wiseri (Calcara, 1842), sample BC 66, scale bars: 2 mm (h), 0.2 mm (i – j, protoconch); k – m: Mikro? sp., sample BC 52, scale bars: 0.2 mm (k – l), 0.1 mm (m, protoconch); n – p: Adeuomphalus densicostatus (Jeffreys, 1884), sample BC 72, scale bars: 0.2 mm (n – o), 0.1 mm (p, protoconch).