Accepted by J. Goy: 11 Sept. 2014; published: 23 Oct. 2014 ZOOTAXA ISSN 1175-5326 (print edition) ISSN 1175-5334 (online edition) Copyright © 2014 Magnolia Press Zootaxa 3878 (2): 185–195 www.mapress.com/zootaxa/ Article 185 http://dx.doi.org/10.11646/zootaxa.3878.2.5 http://zoobank.org/urn:lsid:zoobank.org:pub:BE4E28A1-2B42-49D1-BE55-08ACA57C3E91 First record of the caridean shrimp genus Bresilia Calman, 1896 (Crustacea: Decapoda: Bresiliidae) from the East Pacific and description of a new species MICHEL E. HENDRICKX Laboratorio de Invertebrados Bentónicos, Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, P.O. Box 811, Mazatlán, Sinaloa, 82000, Mexico. E-mail: michel@ola.icmyl.unam.mx Abstract A new species of Bresilia Calman, 1896, representing the first record of this genus for the East Pacific, is described from deep water off the Pacific coast of Mexico. The new species is close to B. atlantica Calman, 1896, the type species of the genus with which it shares the general shape of the carapace and rostrum, the latter with a reduced number of small dorsal teeth, and the shape and relative size of the first pereiopod. It also shares with B. atlantica a similar antennular peduncle and a distally very wide scaphocerite. The first maxilliped has a long crescent-shaped exopod, without a flagellum and a strongly reduced caridean lobe, two characters found in B. atlantica and in only one other known species of Bresilia, i.e., B. corsicana Forest & Cals, 1977. The new species can be distinguished from the other seven species of Bresilia by the armature of the rostrum (few, very small spines) and a much wider scaphocerite, with an anterior margin twice as wide as the proximal margin. Key words: Bresiliidae, Bresilia pacifica sp. nov., Pacific Mexico Introduction Since the family Bresiliidae Calman, 1896, was treated by Holthuis (1993) in its classical review of genera and families of caridean shrimps, many genera he included in the Bresiliidae have been relocated in other families: the genus Agostocaris C.W.J. Hart & Manning, 1986, in the Agostocarididae C.W.J. Hart & Manning, 1986; Discias Rathbun, 1902, Kirnasia Burukovsky, 1988, Lucaya Chace, 1939, and Tridiscias Kensley, 1983, in the Disciadidae Rathbun, 1902; Alvinocaris Williams & Chace, 1982, Chorocaris Martin & Hessler, 1990, and Rimicaris Williams & Rona, 1986, in the Alvinocarididae; and Pseudocheles Chace & Brown, 1978, in the Pseudochelidae De Grave & Moosa, 2004. The Bresiliidae sensu De Grave & Fransen (2011) is therefore currently reduced to a small group of two genera (Bresilia Calman, 1896, and Encantada Wicksten, 1989) and nine species. Encantada spinoculata Wicksten, 1989, the only species of the genus, is so far known only from off the Galapagos Islands (De Grave & Fransen, 2011). The eight species of Bresilia are known from Japan, the Tasman Sea, the Mediterranean, the Red Sea, and the East Atlantic (Calado et al. 2004; Bruce 2005; Komai & Yamada 2010, 2011; De Grave & Fransen 2011). Furthermore, due to the relocation of species previously included in the Bresillidae by De Grave & Fransen (2011), of the three species of "Bresiliidae" reported by Wicksten & Hendrickx (2003) from the eastern tropical Pacific (i.e., E. spinoculata, Discias serrifer Rathbun, 1902, and Alvinocaris lusca Williams & Chace, 1982), only one actually belongs in the family Bresiliidae: E. spinoculata. Except for three species, Bresilia saldanhai Calado, Chevaldonné & dos Santos, 2004, B. gibbosa Komai & Yamada, 2010, and B. rufioculus Komai & Yamada, 2011, collected in shallow-water caves, species of Bresilia occur in deep water, between 133 and 1372 m depth (Komai & Yamada 2010, 2011). Species of Bresilia are also small, from 6 to 29 mm in the total length (Calado et al. 2004; Komai & Yamada 2010, 2011). During sampling operations in deep water off the west coast of the Baja California Peninsula, Mexico, one specimen of Bresilia was collected below the Oxygen Minimum Zone (OMZ) below 1200 m depth. It represents the first record of the genus for the entire East Pacific and the second species of Bresiliidae for this region. It is an undescribed species, which is described and illustrated herein as B. pacifica sp. nov. The type material is deposited