Caecum egenum Vannozzi, 2017

Vannozzi, Angelo, 2023, The Caecidae from BIOMAGLO Expedition in the Mayotte-Glorieuses area (Mollusca, Gastropoda), Zoosystema 45 (12), pp. 421-434 : 430

Caecum egenum Vannozzi, 2017

( Fig. 3B )

Caecum egenum Vannozzi, 2017: 127 , fig. 2G-J, N.; 2019b: 78.

TYPE MATERIAL. — Holotype. Philippines • lv; Balicasag; depth 10-15 m; MNHN-IM-2000-33078 .

TYPE LOCALITY. — Pacific Ocean, Philippines, Balicasag, depth 10- 15 m.

MATERIAL EXAMINED. — Mayotte • 1 dd; Mozambique Channel , W Mayotte, BIOMAGLO Stn DW4854; 12°56’S, 44°58’E; 455- 465 m depth; 4.II.2017; MNHN .

DISTRIBUTION. — Known from Mayotte, Papua New Guinea and Philippines ( Vannozzi 2017; 2019b). This is the first record for Indian Ocean.

DIAGNOSIS. — Shell small for the genus, colourless, smooth. Tube subcylindrical adapically, cylindrical in the middle and contracted toward the aperture, with a slight swelling in the ventral side. Aperture simple ending with a reflected lip. Septum dome shaped with an ear-like mucro rotated toward the right side. Length 1.5 mm.

REMARKS A single shell was found in the material from BIOMAGLO Expedition. No differences could be observed with respect to the holotype.

Figures

FIG. 3. — Side and ventral views of Caecum Fleming, 1813 and Mauroceras Vannozzi, 2019 species from BIOMAGLO expedition.: A, C. hyalinum Vannozzi, 2022 from Stn DW4847; B, C. egenum Vannozzi, 2017 from Stn DW4854; C, C. cf. mauritianum de Folin, 1868 from Stn DW4820; D, E, C. mauritianum; D, holotype MNHN-IM-2000-24911; E, paratype MNHN-IM-2000-24912; F-L, C. cooki Pizzini & Raines, 2011; F, specimen from Stn DW4847; G, H, specimens from Stn DW4854 (H, juv.); I-L, specimens from Stn DW4820; M, M. kajiyamai (Habe, 1963) from Stn DW4847; N, M. sandwichense (de Folin, 1881) juv.from Stn DW4854. Scale bar: 1 mm. Images D, E, courtesy of Ph. Maestrati (MNHN).