Stacked from 43 images. Method=B (R=8,S=4)
Stacked from 31 images. Method=B (R=8,S=4)
Species ID
OC-SP-0002551
Discovered
Phylum
Mollusca
Species ID
OC-SP-0002551
Provisional Species Name
Anachis sp_MNHN_IM_2000_40367
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 can easily be distinguished from other species of deep water Anachis from the region by its shouldered whorls, a feature so far only known in A. facula Monsecour & Monsecour, 2016. It differs from this species by its much bigger size, smaller protoconch, higher number of teleoconch whorls, wider aperture and no denticulation at the inside of the outer lip.
Received All Minimal Data for Discovery
01/04/2026
Description of Material
Shell of small size for the genus, adult size up to 5.0mm; fusifom, elongate, shouldered whorls. Semi-translucent. Suture slightly impressed. Protoconch paucispiral, consisting of about 1.4 smooth whorls. Transition to teleoconch clearly visible. Teleoconch consisting of about 3.8 whorls. Axial sculpture on all whorls, consisting of axial ribs with rather narrow interspaces. There are 13-14 ribs on each of the teleoconch whorls. The last axial rib close to the aperture is stronger. Spiral sculpture apart from the basal cords absent. The basal cords are clearly present and reach to the adapical end of the columella. Aperture rather wide for the genus, about 47% of shell height. Outside of outer lip with the continuation of the basal cords. Inside of outer lip without a clear sinus and not denticulate. Columellar callus clearly present, not raised, with a clear denticle on the abapical side. Parietal callus very weak. Siphonal canal short, open, slightly recurved. Teleoconch, aperture and protoconch semi-translucent white. Columella white.
Ecology
Direct developing species with paucispiral protoconch, so non planctotrophic larvae. Most likely endemic.
Distribution
SPANBIOS expedition MNHN: Stn CP5221, 18°41,7’S, 163°06,1’E, 826-850m, 1 dd, 5 dd juv; stn DW5166, 18°40’S, 163°16’E, 556-577m, 1 dd, 2 dd juv; stn DW5167, 18°41,2’S, 163°15,9’E, 568-575m, 1 dd (holotype); stn DW5223, 18°29,1’S, 162°59,9’E, 530-545m, 4 dd, 2 dd juv; stn DW5237, 18°04,5’S, 163°00,9’E, 339-356m, 1 dd juv; stn DW5243, 18°00’S, 162°59,7’E, 607-620m, 1 dd juv; stn DW5244, 17°59,3’S, 162°59,8’E, 723-727m, 2 dd.
Scientific Name Authorship
Monsecour, Kevin
Stacked from 43 images. Method=B (R=8,S=4)
Stacked from 31 images. Method=B (R=8,S=4)
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