New Species and Records of Cave Shrimps from the Yucatan Peninsula (Decapoda: Agostocarididae and Hippolytidae) Author(s):

The second known agostocaridid shrimp, Agostocaris bozanici, is described from a cenote on Cozumel Island. The new species is characterized by having a dorsally unarmed rostrum, and 5 pairs of lateral, and 5 pairs of posterior spines on the telson. A new genus and species of hippolytid, Yagerocaris cozumel, is described from a different cenote and an anchialine cave on Cozumel. The genus is characterized primarily by the possession of a very strong pterygostomian spine on the carapace, subequal second pereiopods in which the carpi have 5 articles, a single arthrobranch of maxilliped 3, and a rectangular posterior lobe on the telson. Both shrimps are true anchialines, having been taken from marine-salinity water in cenotes well away from the coast, and both have reduced eyes. The hippolytid shrimps Somersiella sterreri Hart and Manning (previously known only from Bermuda) and Janicea antiguensis (Chace) (previously recorded from Antigua, Bermuda, and the Bahamas) are recorded from a cave on Cozumel Island. While these latter 2 species show some differences from the original descriptions, it is felt to be premature to place them in new taxa. Numerous species of caridean shrimps have been recorded from the fresh-water, anchialine, and marine caves on islands of the Caribbean and the Yucatan Peninsula of Mexico (Hobbs and Hobbs, 1976; Hobbs, et al., 1977; Holthuis, 1986). From the latter area alone, three species of Typhlatya are known (one undescribed), in addition to Creaseria morleyi (Creaser), while a species of Procaris awaits description. With many more caves and cenotes being explored, further shrimp records can be expected, as the present two records demonstrate. (Cenote is the Mayan word for a cave or naturally occurring well containing water.) With each such record, another piece falls into place in the jigsaw puzzle that is the biogeography of anchialine shrimps of the world. The present material was collected by a team of cave divers who visited some of the cenotes of the Yucatan Peninsula during 1987 and 1988, and was made available to the Smithsonian Institution by Ms. Jill Yager. Family Agostocarididae Hart and Manning, 1986 Agostocaris bozanici, new species Figs. 1-3 Material.-Holotype USNM 211443, 9 CL 7.4 mm, paratypes USNM 211444, 1 2 CL 8.0 mm, 3 immature CL 5.9, 4.8, 4.3 mm; Xcan-ha Cenote (Cenote Roja), Cozumel Island, Quintana Roo, Mexico, 80-100 ft (24.4-30.4 m) below surface of water, salinity 34%o; collected by J. Bozanic 25, 29 September 1987.-Paratype USNM 211465, 9 CL 5.2 mm; Xcan-ha Cenote, Cozumel Island, Quintana Roo, Mexico; collected by H. Ayala, D. Drago, 18 March 1988.-Paratypes, USNM 211466, 2 CL 7.2 mm, 2 immature CL 4.0 mm, 4.1 mm; Xcan-ha Cenote, Cozumel Island, Quintana Roo, Mexico, 60-136 ft (18.3-41.5 m) below surface of water, salinity 34%0; collected by J. Bozanic, 6 April 1988. Description. -Integument firm, thin, with sparse scattering of tiny black chromatophores. Rostrum triangular, apically acute, bilaterally compressed, dorsally unarmed, carinate, carina extending onto anterior carapace for distance equal to rostral length, ventrally carinate. Dorsal profile of carapace evenly convex; infraorbital and branchiostegal angles rounded; very faint orbitobranchial sulcus present. Pleuron of abdominal somite 2 broadly ovate; pleura of somites 3-5 posteroventrally rounded; somite 6 dorsally twice length of somite 5, with small posteroventral tooth. Telson about 3 times longer than basal width, tapering slightly, bearing 5 pairs of mobile lateral spines; posterior margin slightly convex, armed with 5 pairs of spines, second pair from lateral margin longest. Eye not differentiated into cornea and stalk, lacking pigment, conical, directed anterodorsally. Antennule with basal peduncular article subequal in length to articles 2 and 3 combined; stylocerite with proximal two-thirds parallel-sided, apically acute; su-