Caecum mauritianum de Folin 1868

Caecum cf. mauritianum de Folin, 1868 (Fig. 3 C-E) Caecum mauritianum de Folin, 1868: 84, pl. 9, figs 8, 9. TYPE MATERIAL. — Holotype. Mauritius • dd; Mauritius; MNHN-IM-2000-24911. Paratype. Mauritius • 1 dd worn; same data as for holotype; MNHN-IM-2000-24912. TYPE LOCALITY. — Indian Ocean, Mauritius. MATERIAL EXAMINED. — Mayotte • 1 dd worn; Mozambique Channel, S Mayotte, BIOMAGLO Stn DW4820; 13°05’S, 45°06’E; 295-336 m depth; 27.I.2017; MNHN. DISTRIBUTION. — Described from Mauritius, it was reported from New Caledonia (Pizzini et al. 2013). DIAGNOSIS. — Shell of average size for the genus. Tube subcylindrical, smooth or with ill-defined very small rings. Aperture slightly inclined, preceded by a narrow varix-like swelling. Septum narrow, dome-shaped with a dorsal nail-like mucro slightly rotated towards the right. Length 2.5 mm. REMARKS A single, rather worn shell was found in the available material, on the whole in agreement with de Folin’s description and drawing, but not very well fitting the type specimens. In fact, the holotype and the paratype of C. mauritianum, shown in Figure 3D, E, are smaller and less curved with more pointed mucro. For this reason, its identification of the specimen from Mayotte is tentative. The relationship between this species and C. sericeum de Folin, 1873, described from Mayotte, needs to be re-evaluated based on additional material.Published as part of Vannozzi, Angelo, 2023, The Caecidae from BIOMAGLO Expedition in the Mayotte-Glorieuses area (Mollusca, Gastropoda), pp. 421-434 in Zoosystema 45 (12) on page 430, DOI: 10.5252/zoosystema2023v45a12, http://zenodo.org/record/817745