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

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

( Figs 1 View FIG ; 4D View FIG ; 6G View FIG ; 8C View FIG ; 9F View FIG )

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 View FIG ), and three higher intervarical ribs. In C. ( S.) cailleti , the highest intervarical nodules are on P1 and P2 ( Fig. 6G View FIG ), and are higher than in C. ( S.) guionneti .

Chicoreus ( Siratus) articulatus (Reeve, 1845) ( Figs 4G View FIG ; 5A, B View FIG ; 6D View FIG ; 8E View FIG ; 9D View FIG )

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 View FIG ). 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 View FIG ) while the reliefs of P1 and P2 are both less pronounced in C. ( S.) guionneti n. sp. ( Fig. 6F View FIG ). Regarding the spiral cords, C. ( S.) guionneti n. sp. is characterized by the absence of ABP.

Chicoreus ( Siratus) formosus (Sowerby, 1841) ( Figs 4F View FIG ; 5C, D View FIG ; 6E View FIG ; 9C View FIG )

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 View FIG ). 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).