PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON I17(3):377-384. 2004. A new species of caridean shrimp of the family Stylodactylidae from the eastern Pacific Ocean Mary K. Wicksten and Joel W. Martin (MKW) Department of Biology, Texas A&M University, College Station, Texas 77843-3258, U.S.A., e-mail:
[email protected] (JWM) Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, U.S.A., e-mail:
[email protected] Abstract. — Four specimens of shrimp of the family Stylodactylidae were collected at two stations off Baja California, Mexico, and California, U.S.A. These are the first specimens of the family reported from the eastern Pacific. The shrimp are described as a new species, Bathystylodactylus echinus. The species can be recognized by the following features: rostrum straight, much longer than the carapace, bearing at least 23-27 dorsal and 18-25 ventral spines; eye small and without pigment, stylocerite slender and not reaching middle of first segment of antennular peduncle, carapace without prominent posterior dorsal hump, body set with minute spinules, posterior pereopods con-siderably longer than anterior two pair, slender and lacking fringe of setae. Shrimp of the family Stylodactylidae are recognized by their peculiar first and sec-ond pereopods, which end in elongate but nearly equal fingers with setae on the cut-ting edges. These pereopods and the max-illipeds are densely setose. Species of the family are widely distributed from tropical to temperate regions (e.g., Cleva 1990a), al-though most of the species described to date have come from the tropical Indo-Pacific (Chace 1983; Cleva 1990b, 1994, 1997; Okuno and Tachikawa 2000). Chace (1983) and Cleva (1994) reviewed the members of the family, described new species, and pro-vided keys. Hanamura and Takeda (1996) described an additional genus, Bathystylo-dactylus, for a new species {B. inflatus) from off Taiwan (and for the former Sty-lodactylus bathyalis from the Coral Sea), bringing to 5 the number of recognized genera in the family (Stylodactylus, Neos-tylodactylus, Parastylodactylus, Stylodac-tyloides, and Bathystylodactylus). There have been no previous reports of the family in the eastern Pacific Ocean. While sorting specimens in the Benthic Invertebrate Collection of Scripps Institu-tion of Oceanography, we found four spec-imens of shrimp of this family from three stations taken off California, U.S.A., and Baja California, Mexico. The specimens in-clude both males and females. We com-pared these specimens with specimens of Stylodactylus rectirostris in the collections of Texas A&M University (catalog number 2-7212, Oregon station 5916) and with published descriptions of other species in the family. The specimens represent an un-known species of Bathystylodactylus, de-scribed herein. Systematic Account Bathystylodactylus echinus, new species Figs. 1-5 Holotype: Male, carapace length (CL) 32.7. Basin off Magdalena Bay, Baja Cah-fornia, Mexico (24°35'N, 113°25'W), 3563-3621 m, 6-foot Sigsbee trawl, 24 June 1965, ship Horizon sta. MV65-I-38, Carl Hubbs, collector; Scripps Institution of
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