Stacked from 28 images. Method=B (R=8,S=4)
Stacked from 20 images. Method=B (R=8,S=4)
Species ID
OC-SP-0002556
Discovered
Phylum
Mollusca
Species ID
OC-SP-0002556
Provisional Species Name
Anachis sp_MNHN_IM_2000_40372
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 differs from A. pinguis by the more straight whorls with slightly incised suture, the higher number of axial ribs which are not triangular, the more narrow aperture and the more raised columellar callus. It differs from A. sp 15 by its more elongate shape, higher number of teleoconch whorls, less rounded whorls, more insiced suture and higher number of closer set axial ribs.
Received All Minimal Data for Discovery
01/04/2026
Description of Material
Shell of very small size for the genus, adult size up to 2.7 mm; fusifom, elongate. Rather sraight whorls. Suture slightly insiced. Protoconch paucispiral, consisting of about 1.5-1.6 smooth whorls. Transition to teleoconch weakly visible. Teleoconch consisting of about three whorls. Axial sculpture on all whorls, consisting of axial ribs with narrow interspaces. There are 17 ribs on the first teleoconch whorl diminishing in number to 15 on the last whorl. Spiral sculpture absent apart from very weak, almost obsolete basal cords, which reach to just below the adapical end of the columella. Aperture rather narrow for the genus, about 49% of shell height. Outside of outer lip smooth, with just very weak continuation of the basal cords on the extreme abapical end. Inside of outer lip without a clear sinus and with 5 denticles. Most adapical denticle is very week, the two just below are stronger and semi-merged, the next is weak and the most abapical one on the edge of the canal is again stronger. Columellar callus clearly present, slightly raised, with a thickekened spot about its middle. Parietal callus clearly present. Siphonal canal short, open, slightly recurved. Protoconch, teleoconch and aperture all semi-translucent white. Columella white. Height of holotype: 2.6 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, 4 dd, 2 dd juv; stn DW5166, 18°40’S, 163°16’E, 556-577m, 4 dd; stn DW5167, 18°41,2’S, 163°15,9’E, 568-575m, 2 dd; stn DW5210, 18°08,1’S, 163°08,4’E, 416-420m, 7 dd; stn DW5239, 18°07,3’S, 163°02’E, 249-251m, 1 dd; stn DW5243, 18°00’S, 162°59,7’E, 607-620m, 6 dd (holotype incl).
Scientific Name Authorship
Monsecour, Kevin
Stacked from 28 images. Method=B (R=8,S=4)
Stacked from 20 images. Method=B (R=8,S=4)
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