Stacked from 27 images. Method=B (R=8,S=4)
Stacked from 24 images. Method=B (R=8,S=4)
Species ID
OC-SP-0002581
Discovered
Phylum
Mollusca
Species ID
OC-SP-0002581
Provisional Species Name
Retizafra sp_MNHN_IM_2000_40351
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 is closest to Retizafra sp5 with which it superficially shares about the same spiral and axial sculpture. It can be distinguished from R. sp5 by its protoconch and teleoconch with more whorls, less rounded more elongate shell, narrower aperture, lower number of spiral cords and a shorter, weaker ridge on the columella.
Received All Minimal Data for Discovery
01/04/2026
Description of Material
Shell of small size for the genus, adult size up to 2.6 mm; fusifom with rather straight whorls. Slightly shouldered. Suture slightly impressed. Slightly translucent. Protoconch paucispiral, consisting of about 1.4 smooth whorls. Transition to teleoconch weak. Teleoconch consisting of about 3.6 whorls. Axial sculpture of about 18 ribs on every whorl. On the first whorl these ribs are rather weak, but these ribs become stronger on the further whorls. The last ribs close to the aperture very weak. Spiral sculpture of one clear subsutural cord on all teleoconch whorls. Apart from this cord, the fist whorl has no spiral sculpture. On the second whorl the spiral additional sculpture appears very weak, become more and more visible towards the last whorl. This spiral sculpture consists of rather flat cords with narrow interspaces, which overrun the axial ribs. On the second whorl there are 4 such cords. On the last whorl there are 8 spiral cords, going over in the basal cords abapically. Basal cords clearly present, ventrally ranging to just below the adapical end of the columella. Aperture average width for the genus, about 43% of shell height. Outside of outer lip weakly thickened, with the continuation of the basal cords and spiral sculpture clearly present. Inside of outer lip with a weak sinus on the adapical end and not denticulate. Columellar callus clearly present, not raised, with a weak rim more inside on the abapical side. Parietal callus clearly present, rather thin. Siphonal canal short, open, slightly recurved. Shell color off-white with irregular cream markings. Aperture, columella and parietal callus white with some cream shining through. Protoconch 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 DW5243, 18°00’S, 162°59,7’E, 607-620m, 3 dd (incl. holotype).
Scientific Name Authorship
Monsecour, Kevin
Stacked from 27 images. Method=B (R=8,S=4)
Stacked from 24 images. Method=B (R=8,S=4)
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