A New Species of Munida Leach (Decapoda, Galatheidae) from Off the West Coast of Baja California, Mexico

A NEW SPECIES OF MUNIDA LEACH (DECAPODA, GALATHEIDAE) FROM OFF THE WEST COAST OF BAJA CALIFORNIA, MEXICO

BY

MICHEL E. HENDRICKX1,3) and MANUEL AYON PARENTE2) 1) 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 2) Postgraduate Program, 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

ABSTRACT

AnewspeciesofMunida (Galatheidae) is described based on three specimens collected off the west coast of Baja California. The new species is distinguished from all other species of Munida known from the East Pacific region by the combination of the following characters: carapace with a transverse row of spines next to the posterior margin, supraocular spines parallel to rostrum, anterior ridges of abdominal somites 2-4 with spines, chelipeds long, moderately robust, a patch of strong granules on both sides of sternite 7 and an antennular basal article with a very short distomesial spine.

RÉSUMÉ

Trois spécimens recoltés au large de la côte ouest de la Basse Californie, Mexique, permet- tent de décrire une nouvelle espèce de Munida (Galatheidae). La nouvelle espèce est distingue de toutes les autres espèces de Munida connues de la région du Pacifique Est par la combinaison des caractères suivants: carapace avec une rangée transversale d’épines près du bord postérieur; épines supraoculaires parallèles au rostre; crêtes antérieures des somites abdominaux 2, 3 et 4 avec des épines; chélipedes longs, moyennement robustes; un groupe de granules de chaque côté du sternite 7; article basal de l’antennule avec l’épine distomesiale très courte.

INTRODUCTION The species of Munida from the eastern Pacific were recently reviewed by Hendrickx (2000, 2003). In these two contributions, 18 species were

3) Corresponding author; e-mail: [email protected]

© Koninklijke Brill NV, Leiden, 2010 Studies on Malacostraca: 305-314 306 CRM 014 – Fransen et al. (eds.), LIPKE BIJDELEY HOLTHUIS MEMORIAL VOLUME reported, including three previously undescribed species. Since 2008, however, Munida gregaria (Fabricius, 1793) and M. subrugosa (White, 1847) are known to be conspecific based on DNA analysis (Pérez-Barros et al., 2008: 423). Consequently, 17 valid species of Munida (but see below) have had at least one record along the Pacific coast of America, from Alaska to Chile. Information related to these species (and many others) has been listed in two important recent contributions. The first deals with all species of Galatheidae and Chirostylidae known from the neotropical region (Fierro et al., 2008) and the second deals with all species of Galatheoidea worldwide (Baba et al., 2008). In these contributions, however, the record of M. microphthalma (a species widely distributed in the Atlantic) in the eastern Pacific is either omitted (see Fierro et al., 2008: table) or considered as questionable (see Baba et al., 2008: 128). In fact, the questionable nature of the single record of M. microphthalma off “Cocos Island” (Isla del Coco), Costa Rica (Faxon, 1893, 1895) in the eastern Pacific by Faxon (1893, 1895) had already been remarked upon by Hendrickx (2003: 178). As far as we know, there has been no deep water sampling around the Cocos Islands since the RV “Albatross” visited the area in 1892. On the other hand, intensive sampling off the coast of western Mexico (see Hendrickx, 2003) failed to reveal the presence or any specimen close to the original description of M. microphthalma. Based on these contributions and considerations, the 16 species of Munida currently confirmed for the eastern Pacific are: M. bapensis Hendrickx, 2000; M. debilis Benedict, 1902; M. curvipes Benedict, 1902; M. gracilipes Faxon, 1893; M. gregaria; M. hispida Benedict, 1902; M. macrobrachia Hendrickx, 2003; M. mexicana Benedict, 1902; M. montemaris Bahamonde & López, 1962; M. obesa Faxon, 1893; M. perlata Benedict, 1902; M. propinqua Faxon, 1893; M. quadrispina Benedict, 1902, M. refulgens Faxon, 1893; M. tenella Benedict, 1902; and M. williamsi Hendrickx, 2000. During sampling off the west coast of Baja California, Mexico, a small series of specimens of Munida was collected and examined. These specimens represent an additional species new to the galatheid fauna of the eastern Pacific.

MATERIAL AND METHODS

Specimens were trawled off the coast of Baja California, in the Califor- nia Current, during exploratory research cruises aimed at determining the availability of deep-water shrimp resources, in particular Pandalus platyceros