Stacked from 56 images. Method=B (R=8,S=4)
Stacked from 35 images. Method=B (R=8,S=4)
Species ID
OC-SP-0002542
Discovered
Phylum
Mollusca
Species ID
OC-SP-0002542
Provisional Species Name
Anachis sp_MNHN_IM_2000_40357
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 constrictocanalis Monsecour & Monsecour, 2016 from the Norfolk Ridge. It differs in its much bigger size, different form of protoconch which is much more elongate, higher number of teleoconch whorls, more triangular axial ribs on early teleoconch whorls, a pronounced spiral subsutural cord, much clearer basal cords and the weaker columellar callus.
Received All Minimal Data for Discovery
01/04/2026
Description of Material
Shell of small size for the genus, adult size up to 6.2 mm; fusifom, elongate. Semi-translucent. Suture slightly impressed. Protoconch paucispiral, consisting of about 1.4 smooth whorls. Transition to teleoconch clearly visible. Teleoconch consisting of about 4.3-4.5 whorls. Axial sculpture on all whorls, consisting of strong axial ribs with wide interspaces. About 9 ribs on the first teleoconch whorl, 8 on the following two whorls and 7 on the final whorl. These ribs are thicker just below midwhorl, giving them a triangular appearance when seen from the side.The last axial rib close to the aperture is much stronger. Spiral sculpture absent apart from a thick, very clear cord just below the suture and apart from the basal cords on the last whorl. Basal cords ventrally ranging to the adapical end of the columella. Aperturer rather wide, about 43% of shell height. Outside of outer lip with continuation of the basal cords. Inside of outer lip without a sinus. A slightly tickened zone is present, but denticulation is not visible. Columellar callus thin, only slightly raised on the abapical side, without denticulation. Parietal callus thin, but clearly present. Siphonal canal short, open, slightly recurved. Teleoconch whorls off-white to cream. On the last whorl two darker orange-brown spiral bands are visible. The inside of the aperture also shows these bands. Columellar and parietal callus white. Protoconch off-white to cream. Height of holotype: 6.0 mm
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, 11 dd juv; stn DW5208, 18°08,7’S, 163°07,1’E, 317-338m, 5 dd, 3 dd juv; stn DW5210, 18°08,1’S, 163°08,4’E, 416-420m, 1 lv juv, 6dd, 9 dd juv; stn DW5237, 18°04,5’S, 163°00,9’E, 339-356m, 3 lv (holotype incl.), 5 lv juv, 120 dd, 25 dd juv; stn DW5240, 18°01,1’S, 163°01,7’E, 397-475m, 1 dd ; stn DW5243, 18°00’S, 162°59,7’E, 607-620m, 4 dd, 2 dd juv.
Scientific Name Authorship
Monsecour, Kevin
Stacked from 56 images. Method=B (R=8,S=4)
Stacked from 35 images. Method=B (R=8,S=4)
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