Sampling the depth: New data on the Caecidae (Mollusca, Gastropoda) from northeastern Papua New Guinea Author Walter, Angelo Vannozzi Via M. L. Longo 8, 00151 Rome (Italy) ang.vannozzi@gmail.com Author Renda, Walter Via Bologna 18 / A, 87032 Amantea (CS) (Italy) w.renda1@tin.it text Zoosystema 2024 2024-06-07 46 14 327 347 journal article 299020 10.5252/zoosystema2024v46a14 b5619e29-fcbd-4ddc-9231-138300251568 1638-9387 12548683 23D972D0-F573-429C-816B-F42AFF02D0B1 Caecum neoguineanum Vannozzi, 2019 ( Fig. 6K ) Caecum neoguineanum Vannozzi, 2019b: 87 , fig. 5A-J. TYPE MATERIAL . — Holotype . Papua New Guinea • sh; S Sek Island ; 5°07.0’S , 145°49.4’E , 17 m depth ; MNHN-IM-2000-34766 . Paratypes . Papua New Guinea • 1 sh; same data as for holotype; MNHN-IM-2000-34767 • 1 sh; W Kranket Island , dredged; 5°11.7’S , 145°48.8’E ; 16-28 m depth ; MNHN-IM-2000-34768 . TYPE LOCALITY . — Pacific Ocean, Papua New Guinea , South of Sek Island, 5°07.0’S , 145°49.4’E , 17 m depth. MATERIAL EXAMINED . — Papua New Guinea • 1 sh; New Ireland ; 2°24’S , 49°55’E ; 272-274 m depth ; 6.IX.2014 ; KAVIENG 2014 Stn DW4495; MNHN . DISTRIBUTION . — Known from northeastern PNG ( Vannozzi 2019b ). DIAGNOSIS . — Shell of average size for the genus, whitish, slightly glossy. Protoconch unknown. Teleoconch tubular, slightly arched, smooth. Early teleoconch subcylindrical, slightly arched, tapering toward the apex. Adult shell cylindrical, slender, slightly arched. Tube slightly inflated before the aperture, which is simple, slightly contracted and inclined, lip not reflected, sharp. No microsculpture. Septum low dome shaped without mucro, recessed below the cutting plane. Operculum and soft parts unknown. Adult shell length c. 2 mm . REMARKS A single worn specimen was found in the examined material, well fitting the holotype . The most similar species is C. japonicum due to the low dome-shaped septum without mucro and contracted aperture. However, C. neoguineanum is slenderer and more cylindrical and shows a characteristic inflated aperture.