Caecum frugi Vannozzi, 2019

(Fig. 6I, J)

Caecum frugi Vannozzi, 2019b: 80, fig. 2V-Y.

TYPE MATERIAL. — Holotype. Papua New Guinea • sh; Kavieng Lagoon, W entrance to Nissel Passage; KAVIENG 2014 Stn KB02; 2°35.2’S, 150°46.2’E, 6 m depth; MNHN-IM-2000-34763.

TYPE LOCALITY. — Pacific Ocean, Papua New Guinea, Kavieng Lagoon, 2°35.2’S, 150°46.2’E, 6 m depth.

MATERIAL EXAMINED. — Papua New Guinea • 1 sh; New Ireland; KAVIENG 2014 Stn DW4412; 2°33’S, 150°40’E; 500-600 m depth; 27.VIII.2014; MNHN • 3 sh (juv); New Ireland; KAVIENG 2014 Stn CP4418; 2°27’S, 150°40’E; 335-340 m depth; 28.VIII.2014; MNHN .

DISTRIBUTION. — Known from northeastern PNG (Vannozzi 2019b).

DIAGNOSIS. — Shell small for the genus, whitish, semitransparent. Protoconch unknown.Teleoconch tubular, arched, almost smooth. Early teleoconch cylindrical, arched, flaring toward the aperture. Adult shell cylindrical, smooth except for several hardly-visible rings in the abapical part. Abapical part slightly swollen, then contracted before the aperture, ending with a fine reflected lip. Septum dome-shaped, on the cutting plane, with a hardly visible mucro just above the cutting plane. Periostracum light brown, dull. Operculum and soft parts unknown. Adult shell length 1.4 mm.

REMARKS

Caecum frugi was described on a single specimen, hence its variability is unknown. Among the examined material, we found a specimen well fitting the holotype, although the annulation in the abapical part is hardly visible (Fig. 6I). Three juveniles were found together with C. miliarium n. sp. and, due to the very small tube diameter and the compatible septum shape, likely belong to C. frugi (Fig. 6J).