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 Mauroceras serratum ( Vannozzi, 2017 ) ( Fig. 8F, G ) Meioceras serratum Vannozzi, 2017: 136 , fig. 3F-N. Mauroceras serratum – Vannozzi 2019b: 90 . TYPE MATERIAL . — Holotype . Philippines • sh; Bohol , Maribohoc Bay , depth 85-110 m ; MNHN-IM-2000-33080 . Paratypes . Philippines • 1 sh juv ; same data as for holotype; MNHN-IM-2000-33081 • 1 sh; Panglao , off Momo Beach , 85 m depth; MNHN-IM-2000-33082 . TYPE LOCALITY . — Philippines , Bohol Island, Maribohoc Bay, depth 85- 110 m. MATERIAL EXAMINED . — Papua New Guinea • 2 sh (1 gs); New Ireland ; KAVIENG 2014 Stn DW4465; 2°43’S , 150°36’E ; 90-228 m depth; 3.IX.2014 ; MNHN • 1 sh; New Ireland ; KAVIENG 2014 Stn DW4487; 2°25’S , 149°59’E ; 130-153 m depth; 6.IX.2014 ; MNHN . DISTRIBUTION . — Sulawesi, Philippines, PNG, Society, Marshall ( Vannozzi 2017 , 2019a , b, unpublished data). DIAGNOSIS . — Shell of average size for the genus, colourless, transparent, glossy. Protoconch unknown.Teleoconch tubular, with strong, flat and wide rings. Early teleoconch conical, slightly twisted. Adult shell subcylindrical, tapering toward both the apex. Aperture simple, inclined, slantwise cutting the last two rings and ending with a reflected lip. Surface smooth with growth lines only. Septum on the cutting plane with a strong pointed mucro, rounded in ventral view. Operculum and soft parts unknown. Adult shell length c. 2.5 mm . REMARKS A few, very worn shells were found. Among them, a growth stage with juvenile part still attached was recovered ( Fig. 8G ).