Stacked from 40 images. Method=B (R=8,S=4)
Species ID
OC-SP-0002573
Discovered
Phylum
Mollusca
Species ID
OC-SP-0002573
Provisional Species Name
Retizafra sp_MNHN_IM_2000_40343
Lowest Valid Taxon Name in WoRMS
Retizafra
Lowest Known Rank
Genus
Status
Discovered
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Embargo
No
Kingdom
Animalia
Phylum
Mollusca
Class
Gastropoda
Order
Neogastropoda
Family
Columbellidae
Genus
Retizafra
Taxonomic Remarks
This species differs from R. zingiber Monsecour & Monsecour, 2016 with which it is also found sympatrically, by its bigger adult size, its more elongate shell, its higher number of axial ribs, the wider aperture, the less prominent spiral sculpture, the lack of a columellar rim and a different color pattern. It differs from R. rotundata Monsecour & Monsecour, 2016 occuring on the Loyalty Ridge by its slightly smaller size, less elongate spire, naroower aperture, raised columellar edge, more prominent parietal callus and different color pattern.
Received All Minimal Data for Discovery
01/04/2026
Description of Material
Shell of rather big size for the genus, adult size up to 4 mm; fusifom with clearly rounded whorls. Suture slightly impressed. Protoconch paucispiral, consisting of about 1.5 smooth whorls. Transition to teleoconch clearly visible. Teleoconch consisting of 3.3 whorls. Axial sculpture of strong axial ribs on all whorls. About 20-22 ribs on each whorl. The last axial rib close to the aperture is much stronger sloping to the edge of the aperture. Spiral sculpture absent on the first whorl and on a part of the second whorl. Rather obsolete on the rest of the second whorl and only clearly visible on the last whorl. This spiral sculpture exists of wide flat spiral ribs with very narrow interspaces. which overrun the axial ribs. On the last whorl 14 of these cords are present, going over in the basal cords. Subsutural cord much wider than the other cords. Basal cords ventrally ranging to just below the adapical end of the columella. Aperture average width for the genus, about 48% of shell height. Outside of outer lip with continuation of the basal cords. Inside of outer lip with a weak sinus on the adapical end and a weak ridge of very weak semi-merged denticles. Columellar callus thick, slightly raised, without denticulation. Parietal callus clearly present. Siphonal canal short, open. First teleoconch whorl starting yellowish-brown, fading in color towards the second whorl becomming off-white to white on the further teleoconch whorls. The inside of the aperture, columellar and parietal callus white. Protoconch yellowish brown with a whitish nucleus. Height of holotype: 3.9 mm
Ecology
Direct developing species with paucispiral protoconch, so non planctotrophic larvae. Most likely endemic.
Distribution
SPANBIOS expedition MNHN: stn DW5211, 18°07’S, 163°10’E, 497-498m, 3 dd juv; stn DW5212, 18°10,9’S, 163°10,5’E, 725-740m, 1dd; stn DW5222, 18°27,5’S, 162°58,1’E, 613-623m, 3dd, 1 dd juv; stn DW5223, 18°29,1’S, 162°59,9’E, 530-545m, 5 dd; stn DW5243, 18°00’S, 162°59,7’E, 607-620m, 6dd (incl Holotype), 4 dd juv; stn DW5244, 17°59,3’S, 162°59,8’E, 723-727m, 2 dd.
Scientific Name Authorship
Monsecour, Kevin
Stacked from 40 images. Method=B (R=8,S=4)
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