Chicoreus (Siratus) cailleti (Petit de la Saussaye, 1856)

Merle, Didier, Garrigues, Bernard & Pointier, Jean-Pierre, 2001, 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, Zoosystema 23 (3), pp. 417-431 : 429

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).

Figures

FIG. 1. — Spiral sculpture (apertural view), Chicoreus (Siratus) cailleti (Petit de la Saussaye, 1856); A, Port-Louis (coll. Lamy), four whorls; B, Saba bank (coll. Lamy), five whorls; C, Saintes (coll. Lamy), six whorls; D, Saintes (coll. Lamy), seven whorls. The siphonal canal is not completely drawn. Abbreviations: see text. Scale bars: 5 mm.

FIG. 4. — Evolution of the tnv (total number of varices including protovarices and intervarical ribs), the NIR (number of intervarical ribs) and the LD [(LP1/D)*10], during the ontogenesis of the seven Chicoreus (Siratus) species. For each species, the mean is used.

FIG. 6. — Profile views of the intervarical nodules; A, Chicoreus (Siratus) ciboney (Clench & Pérez Farfante, 1945), Port-Louis (coll. Lamy), seven whorls; B, C. (S.) perelegans Vokes, 1965, Port-Louis (coll. Lamy), six whorls; C, C. (S.) consuela (Verrill, 1950), Port- Louis (coll. Lamy), seven whorls; D, C. (S.) articulatus (Reeves, 1845), Porto Rico (coll. Garrigues), seven whorls; E, C. (S.) formosus (Sowerby, 1841), Haiti (coll. Garrigues); F, C. (S.) guionneti n. sp., Martinique (paratype, MNHN); G, C. (S.) cailleti (Petit de la Saussaye, 1856), Saintes (coll. Lamy), seven whorls. Abbreviations: see text. Scale bars: 5 mm.

FIG. 8. — Protoconchs and first teleoconch whorl; A, Chicoreus (Siratus) ciboney (Clench & Pérez Farfante, 1945), Port-Louis; B, C. (S.) guionneti n. sp., Martinique; C, C. (S.) cailleti (Petit de la Saussaye, 1856), Saba bank; D, C. (S.) perelegans Vokes, 1965, Port-Louis; E, C. (S.) articulatus (Reeves, 1845), Puerto Cortes; F, C. (S.) consuela (Verrill, 1950), Port-Louis. Abbreviations: see text. Scale bar: 1 mm.

FIG. 9. — A, Chicoreus (Siratus) guionneti n. sp., holotype, MNHN (length 56.7 mm), Marie Galante; B, C. (S.) guionneti n. sp., paratype, MNHN (length 37.8 mm), Martinique; C, C. (S.) formosus (Sowerby, 1841), coll. Garrigues (length 63.9 mm), Haiti; D, C. (S.) articulatus (Reeves, 1845), coll. Garrigues (length: 62 mm), Porto Rico; E, C. (S.) ciboney (Clench & Pérez Farfante, 1945), coll. Lamy (length 53.8 mm), Saba Bank; F, C. (S.) cailleti (Petit de la Saussaye, 1856), coll. Lamy (length 60.1 mm), Guadeloupe; G, C. (S.) consuela (Verrill, 1950), coll. Lamy (length 57 mm), Guadeloupe; H, C. (S.) perelegans, coll. Lamy (length 58 mm), Guadeloupe.

FIG. 5. — Spiral sculpture (apertural view); A, B, Chicoreus (Siratus) articulatus (Reeve, 1845); A, Puerto Cortes (coll. Garrigues), six whorls; B, Porto Rico (coll. Garrigues), seven whorls; C, D, C. (S.) formosus (Sowerby, 1841); C, Haiti (coll. Garrigues), 6.5 whorls; D, Haiti (coll. Garrigues), seven whorls. For A, B, D, the siphonal canal is not completely drawn. Abbreviations: see text. Scale bars: 5 mm.