BARBOURIA YANEZI SP. NOV., A NEW SPECIES OF CAVE SHRIMP (, BARBOURIIDAE) FROM COZUMEL ISLAND, MEXICO

BY

LUIS M. MEJÍA1), ESTEBAN ZARZA and MARILÚ LÓPEZ Lab. Bioespeleología y Carcinología, Universidad de Quintana Roo — Cozumel (UQROO-Cozumel), DDS, Dpto. Ciencias y Humanidades, Avenida Andrés Quintana Roo s/n, C. P. 77640, Cozumel, Quintana Roo, Mexico

ABSTRACT

A new species of the genus Barbouria from Cozumel Island, Mexico, is described. The new species, Barbouria yanezi is similar to Barbouria cubensis in exhibiting a cornea narrower than the eyestalk, and in its telson ornamentation, but differs from the latter species in the number of rostral spines, the proportions of the scaphocerite, the relative proportions of the carpus and propodus of the first and second pereiopods, the relationship between the appendices masculina and interna, and in size: it is larger than B. cubensis. The geographical relationship between the species is discussed.

RESUMEN

Se describe una nueva especie del género Barbouria de la isla de Cozumel, México. Barbouria yanezi nueva especie, es similar a Barbouria cubensis en mostrar una córnea más estrecha que el tallo ocular y la ornamentación del telson, pero difiere de ésta en el número de espinas rostrales, proporciones del escafocerito, proporciones relativas del carpus y propodio del primero y segundo pereiópodo, así como la relación entre el apéndice masculina e interna, además es más grande que B. cubensis. La relación geográfica entre estas especies es discutida.

INTRODUCTION The monotypic genus Barbouria has been reported from various Caribbean islands. Initially, the genus was recorded only in (Von Martens, 1872; Rathbun, 1912), but by the end of the nineteenth century, Barbouria cubensis (Von Martens, 1872) had also been found on the Turks and Caicos Islands, , Cayman Brac, and the Bahamas (Hobbs et al., 1977; Hart & Manning, 1981; Juarrero de Varona & Gómez, 1995), from several localities in anchialine caves on

1) e-mail: [email protected] © Koninklijke Brill NV, Leiden, 2008 Crustaceana 81 (6): 663-672 Also available online: www.brill.nl/cr 664 LUIS M. MEJÍA, ESTEBAN ZARZA & MARILÚ LÓPEZ those islands (Holthuis, 1974; Buden & Felder, 1977; Hobbs et al., 1977; Hobbs, III, 1978; Hart & Manning, 1981; Manning & Hart, 1984; Iliffe, 2003; Álvarez et al., 2004). Recently, some samples were collected from anchialine caves on the Yucatán Peninsula, but these were only identified at the generic level (as Barbouria sp.; Bishop & Illife, 2005). Previously, B. cubensis has been considered a hippolytid shrimp, until Manning & Hart (1984) redefined the generic characters and also detailed the status of the genera Barbouria, Janicea, Somersiella, Parhippolyte,andLigur. Subsequently Christoffersen (1987), proposed that Barbouria be located in a new family, the Barbouriidae. Although few samples have been collected, in those places where these shrimps have been found, they were always abundant. Hobbs III (1978) reported strong variation in the rostral teeth: most samples had included only males, which show such variation; it was not until 1978 that Hobbs could describe the female and confirm similar variation. Several male and female shrimps from a cenote on Cozumel Island are described here as a new species of Barbouria, and its relationships with Barbouria cubensis are discussed. The type specimens are deposited in the National Col- lection (CNCR) of the Instituto de Biología, Universidad Nacional Autónoma de México, Mexico City, and in the Lab. Bioespeleología y Carcinología, Universidad de Quintana Roo — Cozumel.

SYSTEMATICS Barbouria yanezi new species (figs.1,2) Material examined. — Holotype: , 8 March 2006; coll. E. Zarza-González & L. M. Mejía-Ortíz; ◦ ◦ Cenote Tres Potrillos, Cozumel Island, Mexico (20 27 05 N8659 15 W), 26 m depth; CNCR 24678. Allotype: , 8 March 2006; same collectors and locality as holotype; CNCR 24679. Paratypes: Three ,3; 30 March 2006; same collectors as allotype; CNCR 24680. Eleven ,12; 12 December 2004; colls. L. M. Mejía-Ortíz, P. Sabido Itza, and W. Uc-Huchin; BC-UQROO-70. Fifteen ; 20 November 2006; colls. E. Zarza-González, L. M. Mejía-Ortíz, and C. Bulit; BC-UQROO-150. All paratypes were collected at the type locality. Description of holotype male. — Medium-sized shrimp, maximum total length 64 mm. Rostrum slightly large, straight, tip almost reaching distal border of second antennular segment; dorsal margin bearing 5 teeth, 3 in postorbital position, 5 teeth on ventral margin (fig. 1A). Carapace smooth, maximum length 20.9 mm, with antennal spine equal to banchiostegal spine. Branchiostegal groove shallow.