Diodora mirifica Métivier, 1972

Simone, Luiz Ricardo L. & Cunha, Carlo M., 2014, Taxonomical study on the mollusks collected in Marion-Dufresne (MD 55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda), Zootaxa 3835 (4), pp. 437-468 : 464-465

Diodora mirifica Métivier, 1972

Figure 152

Diodora minuta: Matthews & Kempf, 1970: 17 (non Lamarck, 1822).

Diodora mirifica Métivier, 1972: 409 –411 (pl. 1, figs 1–10) [Fernando de Noronha]; Rios, 1985: 14 (fig. 52); 1994: 26 (fig. 57); 2009: 32 (fig. 66); Rios et al., 1987: 58; Leal, 1991: 3738 ( Figs 2 A-B).

Comments: Diodora mirifica is relatively common on Brazilian oceanic islands, particularly at the type locality, Fernando de Noronha. The species has been also found in Trindade ( Rios et al. 1987; Leal 1991), but it is relatively rare in coastal areas. It occurs in shallow waters and is characterized by minute dark spots splayed on the radial sculpture (Fig. 152). The samples collected by the MD55 expedition are juvenile specimens with the foramen not at the shell apex; a small beak is still present just posterior to the foramen (Fig. 152).

Measurements (in mm): MNHN #1: 3.4 by 1.3.

Material examined: Brazil. Espírito Santo; Ilha de Trindade, Enseada dos Portugueses, 20°30’15”S 29°18’46”W, 10–12 m, MNHN, 2 shells (MD55 sta. 1; Bouchet col., v/1987).

Figures

FIGURES 1 – 5: Cornisepta uirapa n. sp. holotype MNHN 25281 (L 4.7 mm). Fig. 1: left-slightly ventral view. Fig. 2: leftslightly dorsal view. Fig. 3: anterior view. Fig. 4: dorsal view. Fig. 5: ventral view. FIGURES 6 – 16: Cornisepta arrepiata n. sp. Fig. 6: holotype MNHN 25282 (L 3.4 mm), right view. Fig. 7: same, dorsal view. Fig. 8: same, left view. Fig. 9: same, ventral-slightly left view. Fig. 10: same, anterior view. Fig. 11: paratype MNHN 25283 (L 3.3 mm) right view. Fig. 12: paratype, MZSP 102943 in SEM, right view (L 2.1 mm). Fig. 13: same, dorsal view. Fig. 14: same, ventral view. Fig. 15: paratype MNHN 25283, left view (L 2.1 mm). Fig. 16: same as Fig. 12, detail of outer surface in middle level (scale 0.2 mm). FIGURES 17 – 18: Cornisepta aninga n. sp. in SEM. Fig. 17: paratype MZSP 102942, detail of outer surface in middle region (scale 0.2 mm). Fig. 18: same, ventral-slightly left view (L 2.8 mm).