Stacked from 40 images. Method=B (R=8,S=4)
Stacked from 30 images. Method=B (R=8,S=4)
Species ID
OC-SP-0002543
Discovered
Phylum
Mollusca
Species ID
OC-SP-0002543
Provisional Species Name
Anachis sp_MNHN_IM_2000_40358
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 close to A. constrictocanalis, but differs in its bigger size, different protoconch form, higher number of teleoconch whorls, higher number of axial ribs on the first teleoconch whorl, weaker axial ribs on the last whorl and the presence of week spiral sculpture which is clearly visible on the last whorl. It differs from A. sp nov 1 by its higher number of axial ribs on the first teleoconch whorl, the less pronounced axial ribs on all whorls, the absence of the subsutral cord, the presence of spiral sculpture on the first and the last whorl and the different color pattern.
Received All Minimal Data for Discovery
01/04/2026
Description of Material
Shell of small size for the genus, adult size up to 5.3mm; 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 whorls. Axial sculpture on all whorls, consisting of axial ribs with wide interspaces. About 13 ribs on the first teleoconch whorl and 8-9 on the following whorls. The ribs on the second and third whorl are slightly thicker just below midwhorl, giving them a triangular appearance when seen from the side. The ribs on the last whorl lack this feature. The last axial rib close to the aperture is much stronger. Spiral sculpture very weak on the first teleoconch whorl, consisting of flat cords with very narrow interspaces, becoming absent on the lower teleoconch whorls, but re-appears on the last teleoconch whorl. On the last whorl there are about 17-18 of these weak cords, going over in much clearly present basal cords. Basal cords ventrally ranging to just below the adapical end of the columella. Aperturer rather wide, about 40% of shell height. Outside of outer lip with continuation of the spiral sculpture. Inside of outer lip without a sinus and without denticulation. Columellar callus thin, slightly raised, without denticulation. Parietal callus weak. Siphonal canal short, open, slightly recurved. Teleoconch whorls off-white with some weak cream irregular markings. The inside of the aperture with the shell color shining through. Columellar and parietal callus white. Protoconch white with some cream near the nucleus. Height of holotype: 5.2 mm
Ecology
Direct developing species with paucispiral protoconch, so non planctotrophic larvae. Most likely endemic.
Distribution
SPANBIOS expedition MNHN: stn DW5228, 18°14,9’S, 163°02,6’E, 241-243m, 3 dd, 1 dd juv; stn DW5229, 18°13,3’S, 163°03,3’E, 247-248m, 2 dd, 1 dd juv; stn DW5238, 18°06,5’S, 163°03,4’E, 254-274m, 2dd, 2 dd juv; stn DW5240, 18°01,1’S, 163°01,7’E, 397-475m, 2 dd ; stn DW5243, 18°00’S, 162°59,7’E, 607-620m, 9 dd (holotype incl), 12 dd juv; stn DW5244, 17°59,3’S, 162°59,8’E, 723-727m, 3 dd.
Scientific Name Authorship
Monsecour, Kevin
Stacked from 40 images. Method=B (R=8,S=4)
Stacked from 30 images. Method=B (R=8,S=4)
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