FOUR NEW RECORDS OF CARIDEAN SHRIMPS (DECAPODA:PALAEMONIDAE, ALPHEIDAE) IN MEXICAN PACIFIC WATERS

BY

BETEL MARTNEZ-GUERRERO1,3) and MICHEL E. HENDRICKX2,4)1) Laboratorio de Biotecnologa de Microalgas, Universidad del Mar, Campus Puerto ngel,

Oaxaca, 70902, Mexico2) Unidad Acadmica Mazatln, Instituto de Ciencias del Mar y Limnologa,

Universidad Nacional Autnoma de Mxico, P. O. Box 811, Mazatln, Sinaloa 82000, Mexico

ABSTRACT

New records are provided for four species of caridean shrimp (Alpheidae and Palaemonidae)from Sonora, Sinaloa, and Oaxaca, along the west coast of Mexico. Alpheus tenuis Kim & Abele,1988 extends its northern range to Puerto Peasco, Sonora. Alpheus martini Kim & Abele, 1988 isrecorded for the first time outside of Panama (Alcatraz Island, Sonora). Pontonia simplex Holthuis,1951 is recorded from Teacapan, Sinaloa, in the pen shell Atrina maura (Sowerby, 1835), whichconstitutes a new host record; additionally, its live colour pattern is described. The range of Pontoniamargarita Smith, 1869 is extended along the Mexican coast south to Oaxaca.

RSUMDe nouveaux registres concernant quatre espces de crevettes carids (Alpheidae et Palae-

monidae) rcoltes au Sonora, Sinaloa et Oaxaca, le long de la cte ouest du Mexique, sont cits.Alpheus tenuis Kim & Abele, 1988 tend sa distribution au nord jusqu Puerto Peasco, Sonoraet Alpheus martini Kim & Abele, 1988, jusqu lle dAlcatraz, Sonora. Un nouveau registre et unnouvel hte (Teacapan, Sinaloa, dans le jambonneau lampe Atrina maura (Sowerby, 1835)) sont citspour Pontonia simplex Holthuis, 1951, et la description des couleurs est donne pour des spcimensvivants. La distribution de Pontonia margarita Smith, 1869, est tendue vers le sud jusqu Oaxaca.

INTRODUCTION AND MATERIAL

Wicksten & Hendrickx (2003) presented an updated list of the species of shrimp(Dendrobranchiata, Caridea, and Stenopodidea) known to occur in the easterntropical Pacific, including Mexico. In recent years, only a few new species ofCaridea have been reported from the Pacific coast of Mexico: Synalpheus lani

3) e-mail: alpheusb@hotmail.com4) e-mail: michel@ola.icmyl.unam.mx Koninklijke Brill NV, Leiden, 2011 Crustaceana 84 (9): 1111-1115Also available online: www.brill.nl/cr DOI:10.1163/001121611X584325

1112 BETEL MARTNEZ-GUERRERO & MICHEL E. HENDRICKX

Hermoso-Salazar & lvarez, 2005, from Punta de Mita, Nayarit; Synalpheuswickstenae Hermoso-Salazar & Hendrickx, 2006, and Synalpheus stylopleuronHermoso-Salazar & Hendrickx, 2006 from off Altata and Lobos Island, Sinaloa, allfrom shallow water; the deep-water Glyphocrangon taludensis Hendrickx, 2010,from off Sinaloa; and the pelagic pasiphaeid Psathyrocaris fragilis Wood-Mason,1893, for Pacific Mexico (Hendrickx & Wicksten, 2011). Additionally, newrecords or range extensions for several species have appeared. Hermoso-Salazar& Hendrickx (2005a, b) extended the northern distribution limit of Synalpheusperuvianus Rathbun, 1910 to Altata and Teacapn, Sinaloa, and slightly extendedthe range of Alpheus bellimanus Lockington, 1877, and A. cristulifrons Rathbun,1900, within the Gulf of California. Hendrickx & Wicksten (2004) increasedthe northernmost distribution limit of Acanthephyra brevicarinata Hanamura,1984, to the Guaymas Basin, Gulf of California, and reported the presenceof Glyphus marsupialis (Fihol, 1884), off western Mexico. Hendrickx (2008)increased the northernmost distribution limits within the Gulf of California ofboth Palaemonetes hiltoni Schmitt, 1921, and Alpheus hyeyoungae Kim & Abele,1988. Hendrickx & Wicksten (2011) increased the northernmost distribution limitof Periclimenes infraspinis (Rathbun, 1902), Alpheus cristulifrons Rathbun, 1900,Automate rugosa Coutire, 1900, and Plesionika trispinus Squires & Barragn,1976, and the southernmost distribution limit of Typton hephaestus Holthuis, 1951,and Lysmata californica (Stimpson, 1866) along the Pacific coast of Mexico.

Recent collections along the Pacific coast of Mexico in 2007 and 2010 providesome new data related to the distribution of four species of Caridea collectedin intertidal and shallow waters. Except when indicated otherwise, the materialexamined was collected by the authors.

Abbreviations used: BCS, Baja California Sur; CL, carapace length in mm;GC, Gulf of California; ETP, eastern tropical Pacific; Coll., collectors; FA, FelipeAmezcua; OHAP, Omar Hernando Avila Poveda; SAO, Sabino Aguario Orduo.The specimens have been deposited in the Regional Collection of Marine Inver-tebrates (EMU) of the Instituto de Ciencias del Mar y Limnologa, UNAM, inMazatln, Mexico.

SYSTEMATIC ACCOUNT

Family PALAEMONIDAE Rafinesque, 1815Pontonia margarita Smith, 1869

Material examined. Three (CL = 4.5-8.5 mm) and 4 (CL = 9.0-11.0 mm) fromLa Tijera Beach, Oaxaca, 12/Nov/2010, in four specimens of Pinctada mazatlanica (Hanley, 1856)(coll.: OHAP, SAO) (EMU-8922).

NEW CARIDEAN RECORDS FROM MEXICAN PACIFIC 1113

Distribution. ETP: GC, BCS (Agua Verde Bay, San Jos Island, EsprituSanto Island); Sonora (Guaymas); Sinaloa (Mazatln); Nayarit (Tres MarasIslands); Jalisco (Barra de Navidad); Costa Rica (Puerto Parker, Playa Blanca,Puerto Culebra); Panama (Panama Bay, Secas Islands, Jicarita Island, Honda Bay,Pias Bay); Colombia (Gorgona Island, Octavia Bay, Cupica Bay, Puerto Utra);Galapagos (Darwin Bay, Genovesa Island) (Hendrickx, 1988; Fransen, 2002).

Habitat. Rocky bottoms; commensal in the bivalves Pteria sterna (Gould,1851) and P. mazatlanica; depth: 0-10 m (Fransen, 2002).

Remarks. One to three specimens of P. margarita were found in each host.Male to female rate: 0 : 1, 0 : 1, 1 : 1 and 2 : 1. P. margarita has been reported asheterosexual pairs in their hosts (Wicksten & Hernndez, 2000; Baeza, 2008),and the presence of one or three specimens in the same host is rather surprising.Specimens of Pinctada mazatlanica examined were kept separately after sampling,thus avoiding possible migration of shrimp from one shell to another. Also, shellswere opened separately; soft parts were removed and transferred into individualcontainers and examined carefully for shrimps. We therefore believe that noindividuals could have escaped our search. The usual sexual size-dimorphismwas observed, with a mean CL for males and females of 6.6 mm and 10.2 mm,respectively. The position inside the host was lateral, in the mantle cavity, facingdirectly towards the aperture of the valves. This position is probably related to thefeeding habits of the shrimps, as P. margarita is known to feed on the dead tissueor secretions of Pinctada mazatlanica (cf. Bauer, 2004), whilst a related speciesfeeds on micro-algae retained in the gills of their host (Aucoin & Himmelman,2010).

The males examined have the third segment of the antennular peduncle slightlylonger than the penultimate segment, and the appendix masculina overreaches theappendix interna by 1.1-1.3 of its length. The new record extends the southernrange limit in Mexico by approximately 1000 km.

Pontonia simplex Holthuis, 1951Material examined. Three (CL 14-15 mm) and 2 (CL 13-15 mm), Teacapn, Sinaloa,

April/2007, in Atrina maura (Sowerby, 1835), salinity 30.6 ppt, temperature 27.6C, depth 20 m(coll. FA) (EMU-8923).

Distribution. ETP: GC, BCS (Puerto Escondido); Jalisco (Puercos Island,Barra de Navidad), Colima (Tenacatita Bay); Costa Rica (Culebra Bay); Panama(canal zone) (Fransen, 2002; Wicksten & Hendrickx, 2003).

Habitat. Commensal with bivalves (Pinna) (Fransen, 2002).Remarks. The material examined was collected from a previously unrecorded

host, Atrina maura. The colour pattern of live specimens was previously unknown(Fransen, 2002), but the present observations record it as follows: body and legs

1114 BETEL MARTNEZ-GUERRERO & MICHEL E. HENDRICKX

white translucent, with oblique, sinuous, bright yellow lines; a yellow, dorsal,discontinuous line running from rostrum to sixth abdominal somite; chelae ofsecond pereiopods with shiny orange spots. Ovigerous females with olive-greenmass of eggs.

Family ALPHEIDAE Rafinesque, 1815Alpheus martini Kim & Abele, 1988

Material examined. One (CL 10.5 mm) from Alcatraz Island (284856N 1115751W),Sonora, 08/Mar/2007, depth 0.5 m, temperature 18C (EMU-8924).

Distribution. ETP: Panama (Whorehouse Reef, Paitilla Point) (Kim & Abele,1998; Mathews & Anker, 2009).

Habitat. Previously recorded from sandy and rocky bottoms; depth: 0-1 m(Kim & Abele, 1988).

Remarks. Alpheus martini was previously known only from Panama. Thepresent record not only increases its distribution by approximately 4000 km to thenorth, but represents only the third record ever.

Alpheus tenuis Kim & Abele, 1988Material examined. One (CL 7.5 mm), Puerto Peasco (311720N 1132949W),

Sonora, 05/Mar/2007, pool in low intertidal with sandy-rocky bottom (EMU-8925).

Distribution. ETP: GC, Sonora (Tiburn Island); Panama (Farfn Point,Whorehouse Reef, Venado Beach) (Wicksten & Hendrickx, 2003).

Habitat. Associated to oozy, sandy, and rocky bottoms; depth: 0-1 m (Kim &Abele, 1988).

Remarks. The material examined extends the northernmost range of A. tenuisto Puerto Peasco, Sonora, by approximately 275 km within the Gulf of California.

ACKNOWLEDGMENTS

We are grateful to the staff of the Laboratorio de Invertebrados Bentnicos(UNAM) (M. Cordero, J. Salgado-Barragn, and M. Ayn-Parente) for their help.Thanks to H. Morzaria-Luna and A. Iris-Maldonado (CEDO, A. C.) for facilitatingequipment and guidance in the field. We thank CONANP (SEGOB) for permissionto visit Alcatraz Island. Thanks to M. K. Wicksten and C. H. J. M. Fransen forproviding data that helped with the identification of specimens.

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NEW CARIDEAN RECORDS FROM MEXICAN PACIFIC 1115

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First received 12 March 2011.Final version accepted 3 June 2011.