Stacked from 22 images. Method=B (R=8,S=4)
Stacked from 17 images. Method=B (R=8,S=4)
Species ID
OC-SP-0002555
Discovered
Phylum
Mollusca
Species ID
OC-SP-0002555
Provisional Species Name
Anachis sp_MNHN_IM_2000_40371
Lowest Valid Taxon Name in WoRMS
Anachis
Lowest Known Rank
Genus
Status
Discovered
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Embargo
No
Kingdom
Animalia
Phylum
Mollusca
Class
Gastropoda
Order
Neogastropoda
Family
Columbellidae
Genus
Anachis
Taxonomic Remarks
This species is closest to Anachis pinguis Monsecour & Monsecour, 2016 from the Norfolk Ridge. It differs by its smaller size, more shouldered whorls, higher number of axial ribs which are not triangular, a more narrow aperture and different color.
Received All Minimal Data for Discovery
01/04/2026
Description of Material
Shell of very small size for the genus, adult size up to 2.5 mm; fusifom, rather globose, rounded whorls. Suture slightly impressed. Protoconch paucispiral, consisting of about 1.5 smooth whorls. Transition to teleoconch clearly visible. Teleoconch consisting of about 2.8 whorls. Axial sculpture on all whorls, consisting of axial ribs with interspaces about the same width as the width of the ribs. There are 17 ribs on the first teleoconch whorl diminishing in number to 13 on the last whorl. Spiral sculpture absent on the early teleoconch whorls and only very weak on the last whorl, consisting of flat cords with narrow interspaces. The basal cords are only weakly present and reach the adapical end of the columella. Aperture average width for the genus, about 53% of shell height. Outside of outer lip with the continuation of the spiral sculpture. Inside of outer lip without a clear sinus and not denticulate. Columellar callus clearly present, slightly raised, smooth. Parietal callus weaker, but clearly present. Siphonal canal short, open, slightly recurved. Teleoconch of the holotype cream with a brownish subsutural band. On the last whorl there is a second spiral band at about midwhorl. Aperture semi-translucent white with the brownish bands shining through. Columella white. Protoconch semi-translucent white. This species has several different color morphs, occuring together. The holotype as described above has a cream shell with brown spiral bands. Other morphs are completely brown, completely white or completely cream. There is also a morph with brownish protoconch and first whorl, becoming off-white with some light purplish hue on the last whorl and yellowish basal cords. Height of holotype: 2.3 mm
Ecology
Direct developing species with paucispiral protoconch, so non planctotrophic larvae. Most likely endemic.
Distribution
SPANBIOS expedition MNHN: stn DW5208, 18°08,7’S, 163°07,1’E, 317-338m, 6 dd, 1 dd juv; stn DW5210, 18°08,1’S, 163°08,4’E, 416-420m, 7 dd; stn DW5237, 18°04,5’S, 163°00,9’E, 339-356m, 84 dd (holotype), 5 dd juv; stn DW5238, 18°06,5’S, 163°03,4’E, 254-274m, 15 dd; stn DW5243, 18°00’S, 162°59,7’E, 607-620m, 22 dd, 3 dd juv; stn DW5244, 17°59,3’S, 162°59,8’E, 723-727m, 5 dd.
Scientific Name Authorship
Monsecour, Kevin
Stacked from 22 images. Method=B (R=8,S=4)
Stacked from 17 images. Method=B (R=8,S=4)
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