Caecum dakuwaqa Pizzini, Raines & Vannozzi, 2013

Walter, Angelo Vannozzi & Renda, Walter, 2024, Sampling the depth: New data on the Caecidae (Mollusca, Gastropoda) from northeastern Papua New Guinea, Zoosystema 46 (14), pp. 327-347 : 336-338

publication ID

https://doi.org/ 10.5252/zoosystema2024v46a14

publication LSID

lsid:zoobank.org:pub:23D972D0-F573-429C-816B-F42AFF02D0B1

DOI

https://doi.org/10.5281/zenodo.12554880

persistent identifier

https://treatment.plazi.org/id/038F87DD-FF8C-FFE4-252E-FCEE3A64CD76

treatment provided by

Felipe

scientific name

Caecum dakuwaqa Pizzini, Raines & Vannozzi, 2013
status

 

Caecum dakuwaqa Pizzini, Raines & Vannozzi, 2013 View in CoL

( Fig. 6 View FIG A-E)

Caecum dakuwaqa Pizzini et al. 2013: 19 View in CoL , fig. 10K-O.

TYPE MATERIAL. — Holotype. Fiji • sh; SE of Viti Levu ; 18°18.5’S, 178°05.8’E; MNHN-IM-2000-24843 . GoogleMaps

Paratypes. Fiji • 8 sh; same data for holotype; MNHN-IM-2000-24844 GoogleMaps 2 sh; Bligh Water, MUSORSTOM 10 Stn DW1314; 17°16’9”N, 178°14’51”E; 656-670 m depth; 5.VIII.1988; MNHN-IM-2000-24847 GoogleMaps 8 sh; Bligh Water, MUSORSTOM 10 Stn DW1333; 16°50’21”N, 178°12’33”E; 200-215 m depth; 8.VIII.1988; MNHN-IM-2000-24848 GoogleMaps 2 sh; Bligh Water, MUSORSTOM 10 Stn DW1334; 16°51’22”N, 178°13’56”E; 251-257 m depth; 9.VIII.1988; MNHN-IM-2000-24849 GoogleMaps 3 sh; S Viti Levu , MUSORSTOM 10 Stn DW1365; 18°12’43”N, 178°32’22”E; 295- 302 m depth; 15.VIII.1988; MNHN-IM-2000-24850 GoogleMaps 1 sh; S Viti Levu , MUSORSTOM 10 Stn DW1376; 18°18’40”N, 178°9’4”E; 497-504 m depth; 17.VIII.1988; MNHN-IM-2000-24851 GoogleMaps 2 sh; S Viti Levu , MUSORSTOM 10 Stn DW1381; 18°17’46”N, 177°54’25”E; 275-430 m depth; 18.VIII.1988; MNHN-IM-2000-24852 GoogleMaps 2 sh; SE Viti Levu , MUSORSTOM 10 Stn CP1354; 17°42’36”N, 178°54’58”E; 959-963 m depth; 12.VIII.1988; MNHN-IM-2000-24853 GoogleMaps 4 sh; S Viti Levu , MUSORSTOM 10 Stn CP1363; 18°12’23”N, 178°33’0”E; 144-150 m depth; 15.VIII.1988; MNHN-IM-2000-24854 GoogleMaps 9 sh; S Viti Levu , MUSORSTOM 10 Stn CP1366; 18°12’21”N, 178°33’3”E; 149- 168 m depth; 15.VIII.1988; MNHN-IM-2000-24855 GoogleMaps 14 sh; S Viti Levu , MUSORSTOM 10 Stn CP1369; 18°11’7”N, 178°23’26”E; 392-433 m depth; 16.VIII.1988; MNHN-IM-2000-24856 GoogleMaps .

Vanuatu • 1 sh; S-SE Santo , MUSORSTOM 8 Stn DW1072; 15°39’53”N, 167°19’36”E; 622-625 m depth; 4.X.1994; MNHN-IM-2000-24845 GoogleMaps 15 sh; E Santo , MUSORSTOM 8 Stn DW1105; 15°2’35”N, 167°7’29”E; 154-179 m depth; 7.X.1994; MNHN-IM-2000-24846 GoogleMaps .

TYPE LOCALITY. — Pacific Ocean, Fiji, southeast of Viti Levu, 18°18.5’S, 178°05.8’E, 260-305 m depth.

MATERIAL EXAMINED. — Papua New Guinea • 1 sh; New Ireland; 2°44’S, 150°35’E; 240-305 m depth; 3.IX.2014; KAVIENG 2014 Stn DW4463; MNHN GoogleMaps 2 sh (1 juv); New Ireland; 2°45’S, 150°37’E; 163- 358 m depth; 3.IX.2014; KAVIENG 2014 Stn DW4470; MNHN GoogleMaps .

DISTRIBUTION. — Northeastern PNG (new record), Vanuatu, Fiji ( Pizzini et al. 2013; Vannozzi 2019b).

DIAGNOSIS. — Shell small for the genus, colourless, transparent, with several brownish annular bands separated by three-four times as-wide interspaces. Protoconch unknown. Teleoconch tubular, slightly arched, dextrally twisted, with very fine rings. Early teleoconch conical. Adult shell slender, subcylindrical, flaring toward the aperture, then contracting and ending with a reflected lip. Septum almost flat without mucro, recessed below the cutting plane. Operculum and soft parts unknown. Adult shell length 1.8 mm.

REMARKS

This species is distinctive due to the subcylindrical twisted tube with bell-shaped aperture. The specimens recorded from PNG are very fresh and allowed to recognise the presence of a colour pattern in this species, never reported so far. In fact, this species is characterised by a colourless transparent shell with narrow brown annular bands separated by three or four times as-wide interspaces. Further knowledge on this species came from a juvenile specimen ( Fig. 6C, D View FIG ), showing a more twisted and more tapering tube. This species occurs in several IWP localities but was recorded always below 100 m depth, suggesting that its habitat occurs in the mesophotic-aphotic zone.

MNHN

Museum National d'Histoire Naturelle

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Caecidae

Genus

Caecum

Loc

Caecum dakuwaqa Pizzini, Raines & Vannozzi, 2013

Walter, Angelo Vannozzi & Renda, Walter 2024
2024
Loc

Caecum dakuwaqa

PIZZINI M. & RAINES B. & VANNOZZI A. 2013: 19
2013
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