Clanculus corallinus (Gmelin, 1791)
Algarve and Mediterranean. Also in Red Sea (antilessepsian). The specimens found by Michel Adanson in Sénégal could belong to another species. Grazer and deposit feeder in infralittoral rocky areas. A. Locard (Coq. mar. côtes de France) reports some findings on the continental shelf. — Original taxon: Trochus corallinus. Synonyms: multigranus, roseus… Differs from C. cruciatus by its big doubled columellar tooth.

Variant “brunnea” Dautzenberg & Dollfus, collected at 10-15m deep, il-Qala-tal-Mistra, Saint Paul’s Bay, N. Malta. 9mm.
« testa conica rubra albo punctata subumbilicata. Anfractibus teretibus; primo 15 sariam, altero 6 sariam tuberculatis. » – J. F. Gmelin: Caroli a Linné. Systema naturae per regna tria naturae, tomus I pars 6, Leipzig 1791, page 3576 item 68.

Under rocks, Ayia Nápia, Famagusta, SE. Cyprus. 9mm.
The sculpture is given by spiral rows of buttons on the whole body. In Cl. cruciatus, they progressively transform into smooth cords on the base.
Immature specimen found at 1m deep, under rock, Anse de l’Arène, Cassis, Provence, S. France. 4mm. The double columellar tooth appears later in the shell development.
A specimen collected in shell grit at 33m deep, Secche di Tor Paterno, off Torvajanica, Roma, Lazio, Italy. 7,5mm.
The species in H. M. D. de Blainville:
Malacozoaires, Paris 1828, plate 10b.
C. corallinus can appear sometimes with smoother base than usual; but the doubled tooth avoids any misidentification.
1m deep, Cassis, Provence, S. France. 9-10mm.
Trochus corallinus in R. A. Philippi, H. C. Küster ed. dir.:
“Die Kreiselschneecken oder Trochoideen”, Systematisches Conchylien-Cabinet, Bd.2:Abt.3, Nürnberg 1846, plate XIV.
 
« Shell globose-conic, umbilicate, coral-red or brown, marked beneath the sutures with narrow flames of white and maculations of brown, and on the base dotted with white; spire conic, acute; sutures subcanaliculate; whorls 5 to 6, convex, spirally granose-lirate, the last rounded, encircled by 14 or 15 conspicuously granose equal ridges, the interstices finely obliquely striate, and with more or less obvious spiral striae; aperture oblique, subtetragonal; outer lip plicate within, dentate above, the tooth usually bifid; basal margin curved, crenulate within; columella inserted deep in the rather narrow umbilicus, bearing a strong dentiform fold above and a large quadrangular biplicate tooth at the base; parietal wall wrinkled; umbilicus white, smooth within, with a crenulate margin. » – H. A. Pilsbry: Manual of conchology, structural and systematic vol. XI, Philadelphia 1889, via BHL.
Trochus corallinus in F. Fontannes: Mollusques pliocènes de la vallée du Rhône et du Roussillon, Lyon 1880, plate XI.
The species, pictured on a stamp of Malta Post.

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