Exomilus edychrous

Exomilus edychrous is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.

Exomilus edychrous
Shell of Exomilus edychrous
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Superfamily:	Conoidea
Family:	Raphitomidae
Genus:	Exomilus
Species:	E. edychrous
Binomial name
Exomilus edychrous (Hervier, 1897)
Synonyms
Clathurella edychroa Hervier, 1897 (original combination) Clathurella edychroa var. violacea Hervier, 1897 Exomilus anxius (Hedley, 1909) Exomilus edychroa violacea Hervier, 1897 Kermia anxia Hedley, 1909 Kermia anxius Hedley, 1909 Kermia edychroa (Hervier, 1897) Kermia gracilis de Folin, 1879 Mangelia anxia Hedley, 1909 Pleurotoma gracilis de Folin, 1879 (invalid: junior homonym of Pleurotoma gracilis Conrad, 1830 and P. gracilis Scacchi, 1836)

Description

The length of the shell varies between 3 mm and 4.1 mm; its diameter 1.1 mm.

(Original description) The small, solid, shell is subcylindrical. The shoulder is sloping, the body perpendicular, the base excavate, sharply angled at base and shoulder. The colour of all specimens seen are faded, but appear to have been buff, the protoconch and spots on the lower whorls darker, the basal keel white. The teleoconch contains three whorls. The protoconch consists of 3½ whorls, of which the first is turbinate, slightly tilted and engraved with microscopic spirally punctured lines, followed by two transitional whorls keeled at periphery, and ornamented by fine close obliquely radiating riblets. The adult sculpture : on the body whorl, fifteen spiral cords, of which the third and eighth are prominent, expressing the angle above and below the barrel of the whorl, the basal cords are broken into beads. The penultimate whorl shows six, and the antepenultimate with three spirals. Broader than the spirals are the perpendicular radials, fourteen on the body whorl, and proportionately fewer on the rest. Commencing at the suture and vanishing on the base, they raise tubercles at the intersection of the spirals. The resulting meshes enclose deep pits in which is a microscopic shagreen surface. The aperture is contracted, straight above, flexed below, fortified by a broad strong varix, out of which a deeply notched subcircular anal sulcus is excavated. The spiral sculpture traverses the varix. Within the outer lip are four tubercles. The inner lip is excavate. The siphonal canal is short and broad.

Distribution

This marine species has a wide distribution: New Caledonia, Queensland, Australia; off Réunion and Southeast Africa

References

• Hervier, J 1897. Descriptions d'espèces nouvelles de Mollusques, provenant de l'Archipel de la Nouvelle-Calédonie (suite). Journal de Conchyliologie 44: 138-151
• Powell, A.W.B. 1966. The molluscan families Speightiidae and Turridae, an evaluation of the valid taxa, both Recent and fossil, with list of characteristic species. Bulletin of the Auckland Institute and Museum. Auckland, New Zealand 5: 1–184, pls 1–23
• Kilburn, R. N. 2009. Genus Kermia (Mollusca: Gastropoda: Conoidea: Conidae: Raphitominae) in South African waters, with observations on the identities of related extralimital species. African Invertebrates 50(2): 217-236

External links

• Fedosov A. E. & Puillandre N. (2012) Phylogeny and taxonomy of the Kermia–Pseudodaphnella (Mollusca: Gastropoda: Raphitomidae) genus complex: a remarkable radiation via diversification of larval development. Systematics and Biodiversity 10(4): 447-477
• "Exomilus edychrous". Gastropods.com. Retrieved 16 January 2019.
• MNHN, Paris: Exomilus edychrous (syntype in the MNHN, Paris)
• Tucker, J.K. (2004). "Catalog of recent and fossil turrids (Mollusca: Gastropoda)" (PDF). Zootaxa. 682: 1–1295. doi:10.11646/zootaxa.682.1.1.
• Moretzsohn, Fabio, and E. Alison Kay. "HAWAIIAN MARINE MOLLUSCS." (1995)