Mauroceras kajiyamai ( Habe, 1963 )

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 : 342-343

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.12554901
persistent identifier	https://treatment.plazi.org/id/038F87DD-FF96-FFFB-2280-FB3B3DD3C9CD
treatment provided by	Felipe (2024-06-26 14:40:18, last updated 2024-11-26 05:36:33)
scientific name	Mauroceras kajiyamai ( Habe, 1963 )
status

Treatment

Mauroceras kajiyamai ( Habe, 1963) View in CoL

( Fig. 8 View FIG A-C)

Meioceras kajiyamai Habe, 1963: 235 View in CoL , fig. 5.

Mauroceras kajiyamai View in CoL – Vannozzi 2023: 431 View Cited Treatment , and synonymy therein.

TYPE MATERIAL. — Holotype. Japan • sh; Ankyaba , Kakeroma Jima, near Amami-Oshima; NMST.

TYPE LOCALITY. — Pacific Ocean, Japan, Ankyaba, Kakeroma Jima, an isle near Amami-Oshima.

MATERIAL EXAMINED. — Papua New Guinea • 2 sh (1 juv); Vitu Islands ; 4°37’S, 149°27’E; 615-647 m depth; 27.IX.2010; BIOPAPUA Stn DW3680; MNHN GoogleMaps • 1 sh; New Ireland; 2°43’S, 150°36’E; 90- 228 m depth; 3.IX.2014; KAVIENG 2014 Stn DW4465; MNHN GoogleMaps .

DISTRIBUTION. — The whole IWP, from the eastern coast of Africa to Maldives, Philippines, PNG, Japan, New Caledonia ( Habe 1963; Hasegawa 2000; Pizzini et al. 2013; Vannozzi 2017, 2019 a, b, 2023, unpublished data).

DIAGNOSIS. — Shell of average size for the genus, colourless, semitransparent, glossy. Protoconch planorbid, smooth, of 1.75 whorls, ending with thickened sinusigera lip. Teleoconch openly coiled, tubular. Early teleoconch rapidly growing forming an open spiral like a cow’s horn, with sharp uniform rings becoming flat and hardly visible adapically. Adult shell subcylindrical, tapering toward both the apex and the aperture. Maximum width located adapically at about ¼ of the length. Septum recessed below the cutting plane, with a strong mucro, showing a straight dorsal side and a sloping, slightly convex ventral side. Aperture simple with reflected lip. Operculum and soft parts unknown. Adult shell length c. 3 mm, protoconch size 300 µm.

REMARKS

This species is widespread and shows little variability. The specimens from PNG show no differences with respect to specimens from other IWP localities.

References

HABE T. 1963. - Eight minute species of shells from Amami Islands far south of Kyushu, Japan, including six new species. Venus 22 (3): 229 - 237. https: // doi. org / 10.18941 / venusjjm. 22.3 _ 229

HASEGAWA T. 2000. - Caecidae, in OKUTANI T. (ed.), Marine Mollusks in Japan. Tokai University Press, Tokyo: 170 - 173.

PIZZINI M., RAINES B. & VANNOZZI A. 2013. - The family Caecidae in the South-West Pacific (Gastropoda: Rissooidea). Bollettino Malacologico 49 (suppl. 10): 1 - 78. https: // www. biodiversitylibrary. org / part / 291987

VANNOZZI A. 2017. - The family Caecidae (Mollusca: Gastropoda) from the Central Philippines. Bollettino Malacologico 53 (2): 121 - 149. https: // www. biodiversitylibrary. org / item / 278548

VANNOZZI A. 2019 a. - Mauroceras, a new genus for Indo-West Pacific species hitherto assigned to Meioceras (Gastropoda: Caecidae). Bollettino Malacologico 55 (1): 55 - 61.

VANNOZZI A. 2023. - The Caecidae from BIOMAGLO Expedition in the Mayotte-Glorieuses area (Mollusca, Gastropoda). Zoosystema 45 (12): 421 - 434. https: // doi. org / 10.5252 / zoosystema 2023 v 45 a 12

Figures

FIG. 8. — Mauroceras Vannozzi, 2019 species from deep-water stations from northeastern PNG: A, B, M. kajiyamai (Habe, 1963) from Stn CP3680 (B, juvenile); C, M. kajiyamai from Stn DW4465; D, E, M. rhinoceros (Pizzini, Raines & Vannozzi,2013) from Stn DW4470; F, G, M. serratum (Vannozzi, 2017) from Stn DW4465 (G, growth stage). Scale bar: 1 mm.