PROC. BIOL. SOC. WASH. 104(2), 1991, pp. 241-246 ARENE BOUCHETI, A NEW INTERTIDAL LIOTIINE TURBINID (MOLLUSCA: GASTROPODA: TROCHOIDEA) FROM TRINDADE ISLAND, SOUTH ATLANTIC OCEAN Jose H. Leal Abstract.— T\\Q turbinid Arene boucheti, new species, is described from the rocky intertidal of the oceanic Trindade Island, located 1 1 00 km off the Bra-zilian coast. Shell, opercular and radular characters allocate A. boucheti in the subfamily Liotiinae. The endemic species is characterized by a depressed, small but heavy shell with nodulose sculpture, coloration of grayish-green radial flamules and thick, strongly prosocline aperture. Resumo. —O turbinideo Arene boucheti sp. n. e descrito. A nova especie e proveniente do mesolitoral rochoso da Ilha da Trindade, situada a 1 1 00 km ao largo da costa brasileira. Caracteres da concha, operculo e radula indicam que A. boucheti pertence a subfamilia Liotiinae. A especie endemica e carac-terizada por uma concha deprimida, pequena e solida, com escultura nodulosa, colora9ao de faixas radiais verde-acinzentadas, com abertura espessa, marca-damente prosoclinea. During the cruise MD55 made in May 1987 by the French research ship Marion-Dufresne, an undescribed turbinid was col-lected alive underneath volcanic boulders in the rocky shore of southeastern Trindade Island. In a similar fashion to several east-em Pacific Hotlines (McLean 1970a, 1970b, 1971), but unlike species from the western Atlantic (Abbott 1 974, Leal 8l Coelho 1985, McLean et al. 1988, Rios 1985), individ-uals of the new species live in the intertidal zone. A distance of 1 1 00 km separates Trin-dade Island from the nearest continental mass, the coast of eastern Brazil (Fig. 1). Trindade and the tiny islets of the Martin Vaz Archipelago, 50 km to the east, are the emerged and most recent expressions of a tectonic hotspot (Morgan 1983). Because of the relative ease in detecting the species due to aggregation of individuals in the rocky intertidal habitat, it is evident that the spe-cies is absent from the Brazilian coast, and endemic from Trindade. The species was not collected in a large number of sublittoral stations made in Trindade, Martin Vaz, and on top of the submerged seamounts of the Vitoria-Trindade Seamount Chain during the cruise MD55 (Leal & Bouchet 1991). Specimens examined are deposited in the following institutions: Los Angeles County Museum of Natural History (LACM); Mu-seu de Zoologia, Universidade de Sao Paulo (MZUSP); Museu Oceanografico de Rio Grande (MORG); Museum national d'His-toire Naturelle, Paris (MNHN). Family Turbinidae Rafinesque, 1815 Subfamily Liotiinae H. & A. Adams, 1854 Genus Arene H. & A. Adams, 1854 Arene boucheti, new species Figs. 2-12, 15-17 Description. —Shell depressed-turbinate, thick-walled, small for genus, reaching 3.6 mm height and 3.9 mm width, opaque-white with radiating grayish-green flamules, 8 flamules in final whorl (Figs. 2-7). Intensity of color flamules vary in different specimens. Periostracum undetectable. Protoconch
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