An analysis of the sculptural pattern of the shell in Caribbean members of Chicoreus (Siratus) Jousseaume, 1880 (Gastropoda, Muricidae), with description of a new species Author Merle, Didier Histoire naturelle, Laboratoire de Paléontologie, UMR 8569 du CNRS, 8 rue Buffon, F- 75005 Paris (France) dimerle @ aol. com dimerle@aol.com Author Garrigues, Bernard Author Pointier, Jean-Pierre Laboratoire de Biologie marine et Malacologie, EPHE, de Biologie et d’Écologie tropicale et méditerranéenne, UMR 5555 du CNRS 52 avenue de Villeneuve, F- 66860 Perpignan cedex (France) pointier @ univ-perp. fr. text Zoosystema 2001 23 3 417 431 journal article 10.5281/zenodo.5400572 1638-9387 5400572 Chicoreus ( Siratus ) cailleti (Petit de la Saussaye, 1856) ( Figs 1 ; 4D ; 6G ; 8C ; 9F ) DESCRIPTION C. ( S. ) cailleti is present in the French Antilles where it lives between 120 and 150 meters deep. It also occurs from Florida to Honduras and Colombia ( Houart 1999 ). C. ( S. ) cailleti is distinguishable from C. ( S. ) guionneti n. sp. by the association of a shorter spire, a lower relief of the spiral cords, a progressive loss of spines ( Fig. 1 ), and three higher intervarical ribs. In C. ( S. ) cailleti , the highest intervarical nodules are on P1 and P2 ( Fig. 6G ), and are higher than in C. ( S. ) guionneti . Chicoreus ( Siratus ) articulatus (Reeve, 1845) ( Figs 4G ; 5A, B ; 6D ; 8E ; 9D ) DESCRIPTION C. ( S. ) articulatus is reported from the southeast and central Caribbean from 160 and 300 meters deep. This species is distinct from C. ( S. ) guionneti n. sp. by the association of narrower teleoconch whorls, thicker spiral cords and developed denticles within the outer lip ( Fig. 5A, B ). The intervarical ribs are generally less numerous (three ribs between each pair of varix) and higher in C. ( S. ) articulatus , but both species may have three ribs between each pair of varix. However, in C. ( S. ) articulatus , the two abapertural ribs are stronger and closer than the third, while in C. ( S. ) guionneti n. sp. , the ribs are smaller and more equally spaced. The relief of the intervarical nodule P2 is also more pronounced than that of P 1 in C. ( S. ) articulatus ( Fig. 6D ) while the reliefs of P1 and P2 are both less pronounced in C. ( S. ) guionneti n. sp. ( Fig. 6F ). Regarding the spiral cords, C. ( S. ) guionneti n. sp. is characterized by the absence of ABP. Chicoreus ( Siratus ) formosus (Sowerby, 1841) ( Figs 4F ; 5C, D ; 6E ; 9C ) DESCRIPTION C. ( S. ) formosus occurs in Jamaica , Cuba , Haiti and Dominican Republic between 20 and 380 meters deep but is unknown in the Lesser Antilles. It differs from C. ( S. ) guionneti n. sp. in the association of narrower teleoconch whorls, thicker spiral cords and marked internal denticles of the outer lip ( Fig. 5C, D ). This species may have three to four intervarical ribs, but the two abapertural ones are more marked and less spaced than in C. ( S. ) guionneti n. sp. The secondary cords s1, s2, s3, and s4 are also heavier in C. ( S. ) formosus than in C. ( S. ) guionneti n. sp. The interrupted brown lines of the primary cords are absent in C. ( S. ) formosus which is often monochromatic (see also Vokes 1980 ).