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Family Strahlaxiidae Poore, 1994

Synalpheus biunguiculatus (Stimpson, 1860) Material examined. For this species, samples from Zacatoso (17 ° 39´N, 101 ° 37´W), in the Ixtapa region were numerous, with six males (ICMyL MAZ 9062 A), five females (ICMyL MAZ 9062 B), 12 juveniles (ICMyL MAZ 9062 C), and four ovigerous females (ICMyL MAZ 9062 D). Remarks. It is a common species on corals and is widespread in the Gulf of California (Wicksten 1983) in Bahía Santiago and in the Huatulco region (Hermoso 1999). In our study, the species was surveyed in several sites from the Islas Marietas to the Huatulco region, associated with corals.

Harpiliopsis depressa (Stimpson, 1860) Material examined. This species was recorded by visual census in all sampled sites. Vouchers also were collected in almost every site from the Islas Marietas, one male (ICMyL MAZ 9021) to the Huatulco region at El Maguey (15 ° 43´N, 95 °08´W), six males (ICMyL MAZ 9087 A) and two females (ICMyL MAZ 9087 B). Remarks. Previous records from Mexican waters were made at the Loreto region by Hernández et al. (2009). Because this species is symbiotic to Pocillopora corals, this species has a wide distribution along the Indo-Pacific, Central America, and Galápagos Islands (Wicksten & Hendrickx 2003). Previous records in Mexican waters south of the Gulf of California were done by Hermoso (1999) at the Huatulco region. For our study, this species was recorded in all the sampled sites and confirms its presence throughout the Mexican Pacific coast.

Tuleariocaris holthuisi Hipeau-Jacquotte, 1965 Material examined. Just one specimen seen in association with a sea urchin (Diadema mexicanum) at La Cacaluta, in the Huatulco region (CONABIO HJ011 ID 2206). Remarks. This is an Indo-Pacific species that was recorded at Los Cabos (22 ° 52´N, 109 ° 53´W) and Punta Arenas in the southern Gulf of California by Wicksten & Hernández (2000). Marin & Anker (2009) recorded this species at Panamá. In Mexican waters, our surveys ranged approximately 1,600 km south to the Huatulco region, with this being the fourth record of the species on the Eastern Pacific coast.

Megalobrachium festae (Nobili, 1901) Material examined. This species was collected only at La Manzanilla (15 ° 51´N, 97 °04´W), with one male (ICMyL MAZ 9423 A) and four females (ICMyL MAZ 9423 B). Remarks. Particularly, this species has a distribution ranging to southern Mexico and was documented to the Huatulco region by Ramírez-Luna et al. (2002), Rodríguez (2008), and García-Madrigal & Andréu-Sánchez (2009). There are some records as far north as Ixtapa region by Hiller et al. (2004). In our study this species was surveyed at La Manzanilla, which confirms its particular distribution to the southern Pacific coast of Mexico.

Subfamily Palaemoninae Rafinesque, 1815

Pachycheles spinidactylus Haig, 1957 Material examined. Collected only once at Morros del Potosí (in the Ixtapa region) with one female (ICMyL MAZ 9326 A) and two ovigerous females (ICMyL MAZ 9326 B). Remarks. This species ranges in the Eastern Pacific from the west coast of the Baja California peninsula through the Gulf of California to the Mexican tropical Pacific coast, at Bahía Navidad (Álvarez del Castillo et al. 1992), Faro de Bucerías (18 ° 21´N, 103 ° 31´W) (Herrera-Arriaga 2004), and the Huatulco region (Ramírez-Luna et al. 2002; García-Madrigal & Andréu-Sánchez 2009). We found P. spinidactylus only once at Morros del Potosí in the Ixtapa region.

Petrolisthes hians Nobili, 1901 Material examined. Four males (ICMyL MAZ 9327 A), six females (ICMyL MAZ 9327 B), and seven juveniles were collected around Isla Roqueta (in the Acapulco region). The southern record for our study was at Estacahuite with six females (ICMyL MAZ 9331 B) and one juvenile (ICMyL MAZ 9331 C). Remarks. The geographic distribution of this species is along the Eastern tropical Pacific, from the outer Gulf of California to Ecuador (Brusca 1980). Our data show the presence of the species along Mexican tropical Pacific coast as previously reported for the Huatulco region by García-Madrigal & Andréu-Sánchez (2009).

Family Paguridae Latreille, 1802

Fennera chacei Holthuis, 1951 Material examined. One male (ICMyL MAZ 9067) and one female (ICMyL MAZ 9068) from Punta Ixtapa (17 ° 39´N, 101 ° 38´W) in the Ixtapa region. One male (ICMyL MAZ 9066 A) and one ovigerous female (ICMyL MAZ 9066 B) from Islas Marietas (20 ° 41´N, 105 ° 34´W). Remarks. A small palaemonid species recorded from collected material and not seen in the field. Hernández et al. (2009) recorded its northern most limit at Bahía de La Paz (24 ° 35´N, 110 ° 24´W) and Wicksten & Hendrickx (2003) note the Galápagos Islands as the most boreal record. We recorded this species from Islas Marietas and the Ixtapa region, providing a new site for Mexican waters about 1,200 km south of previous records.

Pachycheles biocellatus Lockington, 1878 Material examined. The northern site of collected specimens was Pichilinguillo, one male (ICMyL MAZ 9316 A), one female (ICMyL MAZ 9316 B), and one ovigerous female (ICMyL MAZ 9316 C). The southernmost site in our data was Estacahuite were we collected four females (ICMyL MAZ 9320 A). Remarks. This porcellanid crab has a wide distribution in the Eastern tropical Pacific with records from the Gulf of California by Villalobos-Hiriart et al. (1989), the Huatulco region (Ramírez-Luna et al. 2002), and the Acapulco region (see Pereyra 1998). We found P. biocellatus at several sites along the study area, from Pichilinguillo to the Huatulco region, which confirms its presence on the Mexican tropical Pacific coast.

Family Porcellanidae Haworth, 1825

Stenorhynchus debilis (Smith, 1871) Material examined. Two specimens from Isla Cocina (CONABIO HJ011 ID 281) and one specimen from La Boquita (CONABIO HJ011 ID 1607). Remarks. This crab has a wide and well-recorded distribution along the Eastern Pacific. The geographic ranges are from the outer Gulf of California to Valparaíso, Chile (Hendrickx 1999). We recorded this species usually under or behind coral heads and occasionally on coral branches.

Synalpheus digueti Coutière, 1909 Material examined. Fourteen specimens were collected around Isla Roqueta (16 ° 49´N, 99 ° 54´W), in the Acapulco region, with two males (ICMyL MAZ 9376 A), nine females (ICMyL MAZ 9376 B), and two juveniles (ICMyL MAZ 9376 C). Four juveniles were collected at El Maguey (ICMyL MAZ 9377 C), near Huatulco region. One ovigerous female (ICMyL MAZ 9373 A) was collected at Zacatoso in Ixtapa region Remarks. This species was reported by Villalobos-Hiriart et al. (1989) to occur throughout the Gulf of California and the Galápagos Islands. Hermoso (1999) and Martínez (2007) confirmed its presence in the Huatulco region. In our study we recorded S. digueti at several sites along the Mexican Tropical Pacific coast, confirming its distribution in the area.

Family Eriphiidae MacLeay, 1838

Petrolisthes hirtispinosus Lockington, 1878 Material examined. Two females from Islas Marietas (ICMyL MAZ 9339), two females from Zacatoso (ICMyL MAZ 9341 B), and two males from Estacahuite (ICMyL MAZ 9347). Remarks. This species was noted as endemic to the Gulf of California (Brusca 1980), though recently it was recorded in the Huatulco region (García-Madrigal & Andréu-Sánchez 2009). In our study we confirm the presence of the species out of the Gulf of California and provided several sites along the Mexican Tropical Pacific coast, from Islas Marietas to the Huatulco region.

Petrolisthes nobilii Haig, 1960 Material examined. One male (ICMyL MAZ 9352) from La Manzanilla, and three females (ICMyL MAZ 9351) from La Boquita (19 °06´N, 104 ° 23´W). Remarks. The species has a wide distribution ranging from the Gulf of California to Ecuador (Brusca 1980). In tropical Mexican waters the records were made at several sites (see Rodríguez 2008). Our study provides data from two sites in the southern Mexican coast.

Daira americana Stimpson, 1860 Material examined. One male (ICMyL MAZ 9057) from Caleta de Campos and one male from La Manzanilla (ICMyL MAZ 9358 A). Remarks. Recorded from the Gulf of California to the Galápagos Islands (Villalobos-Hiriat et al. 1989). Ramírez-Luna et al. (2002) recorded the species in the Huatulco region as symbiotic to corals. Our data provides two new locations and confirms its presence on the Mexican Tropical Pacific coast.

Family Domeciidae Ortmann, 1893

Phimochirus californiensis (Benedict, 1892) Material examined. One female (ICMyL MAZ 9353 A) and one juvenile (ICMyL MAZ 9353 B) from Estacahuite. Remarks. This species ranges from the Gulf of California to the Galápagos Islands (Villalobos-Hiriat et al. 1989); and into the temperate area from California (USA) to Bahía Magdalena (Hendrickx et al. 2005). Our records from the Ixtapa and Huatulco regions close the gap in its geographic distribution in Mexican waters, ranging about 1,700 km south of the Gulf of California.

Family Dairidae Serène, 1965

Order Decapoda Latreille, 1802

Liomera cinctimana (White, 1847) Material examined. One male from Zacatoso (ICMyL MAZ 9304) in the Ixtapa region, one female from La Boquilla (ICMyL MAZ 9306 A), and one male (ICMyL MAZ 9305) from El Maguey (15 ° 43´N, 96 °08´W) in the Huatulco region. Remarks. This species has a symbiotic relationship with corals and has a wide distribution in the Indo-Pacific. In the Eastern Pacific, records are from the Gulf of California to the Galápagos Islands (Villalobos-Hiriart et al. 1989). In Mexican waters, this species was previously recorded in the Huatulco region (Ramírez-Luna et al. 2002). Our data confirms its presence along the study area.

Ortiz, Luis Hernández Georgina Ramírez, Reyes-Bonilla, Héctor (2013): Coral-associated decapods (Crustacea) from the Mexican Tropical Pacific coast. Zootaxa 3609 (5): 451-464, DOI: http://dx.doi.org/10.11646/zootaxa.3609.5.1

Eupilumnus xantusi (Stimpson, 1860) Material examined. One male (ICMyL MAZ 9063 A), one ovigerous female (ICMyL MAZ 9063 B), and one female (ICMyL MAZ 9063 C) from La Boquita. Remarks. The geographic distribution of this species ranges from the Gulf of California to Ecuador (see Pereyra 1998), with some records at Ixtapa region. In our study, we recorded this species as far as the Huatulco region providing new locations in the Mexican tropical Pacific waters.

Hapalocarcinus marsupialis Stimpson, 1859 Material examined. This species was recorded only by collected specimens because of its cryptic behavior. One ovigerous female (ICMyL MAZ 9306) from Ixtapa region; one ovigerous female (ICMyL MAZ 9080) from El Maguey. Remarks. This species is considered symbiotic to corals and has a wide distribution in the Indo-Pacific, Central Pacific, and Eastern Pacific (see Pereyra 1998). In Mexican tropical waters out of the Gulf, there were no records, so our study closes a gap in its distribution and confirms the presence of H. marsupialis in the study area. The new range for Mexican waters is in the Huatulco region, about 1,700 km south of the previous data. This species occupies crevices in coral branches, so if is not easy to record by surveys, and our records were possible because of our collection of corals and picked out of the coral branches. Only ovigerous females were collected.

Family Trapeziidae Miers, 1886

Calcinus californiensis Bouvier, 1898 Material examined. Six males (ICMyL MAZ 9038 A) form Islas Marietas and one female from the Huatulco region (ICMyL MAZ 9055). Remarks. The distribution of this species has been from the Gulf of California to the Acapulco region and the west coast of the Baja California peninsula (Brusca 1980). There is a sibling species (C. explorator Boone 1930) whose distribution ranges from the central-south Mexican Pacific to the Galápagos Islands (Brusca 1980). However, the sampled material was determined as C. californiensis because of its color pattern of the walking legs (Brusca 1980). Our data, sampled south of the Acapulco region (its previous geographic limit), is the southernmost limit for the species in the Eastern Pacific, increasing its range about 350 km south.

Subfamily Liomerinae Sakai, 1976

Brachycarpus biunguiculatus (Lucas, 1849) Material examined. One specimen observed (CONABIO HJ011 ID 170) at La Ensenada (18 °04´N, 102 ° 45´W) in Caleta de Campos region. Two specimens (CONABIO HJ011 ID 195, 196) at Pichilinguillo (18 ° 11´N, 103 °08´W). Remarks. This species has a cosmopolitan distribution (Wicksten & Hendrickx 2003). In Mexican waters, it has been recorded as north as the Isla Coronado (26 °06´N, 111 ° 16´W) in the Loreto region by Hernández et al. (2009) and the southern site at Bahía Santiago (19 °06´N, 104 ° 22´W) by Hermoso (1999). The present record La Ensenada represents the southern site in mexican waters increasing about 220 km south from the previous data.

Family Alpheidae Rafinesque, 1815

Trapezia bidentata (Forskål, 1775) Material examined. One male (ICMyL MAZ 9408 A) and one ovigerous female (ICMyL MAZ 9408 B) from Islas Marietas, and three males (ICMyL MAZ 9421 A), two females (ICMyL MAZ 9421 B), and two ovigerous females (ICMyL MAZ 9421 C) from Playa Coral (15 ° 51´N, 97 °05´W). Remarks. This species is symbiotic with corals and has a circumptropical distribution (Castro 1997). Along the Mexican tropical Pacific coast, records were made at Isla Isabel (21 ° 51´N, 105 ° 51´W) (Ríos-Jara et al. 2008), Zihutanejo (see Pereyra 1998), and the Huatulco region (Ramírez-Luna et al. 2002). This species was seen in all sampled sites and we confirm its distribution in the study area.

Subfamily Xanthinae MacLeay, 1838

Family Inachidae MacLeay, 1838

Pachycheles panamensis Faxon, 1839 Material examined. Only two specimens were collected at La Manzanilla (ICMyL MAZ 9325). Remarks. Recorded from the Gulf of California to Santa Elena, Ecuador (Villalobos-Hiriart et al. 1989), this species has a wide range in the Eastern Pacific. Records of P. panamensis have been from the Gulf of California to the Huatulco region (Ramírez-Luna et al., 2002). We recorded this species only once at La Manzanilla.

Family Majidae Samouelle, 1819

Subfamily Trapeziinae Miers, 1886

Microcassiope xantusii (Stimpson, 1871) Material examined. Two males from Islas Marietas (ICMyL MAZ 9313), and one male (ICMyL MAZ 9312 A), and one ovigerous female (ICMyL MAZ 9312 B) from La Boquita. Remarks. This crab ranges from the Gulf of California to the Galápagos Islands (Villalobos-Hiriart et al. 1989). There are some records at Zihuatanejo, Acapulco, and the Huatulco regions (see Pereyra 1998) and at Bahía Navidad (Álvarez del Castillo et al. 1993). This species occurs in several habitats and is frequently found on corals. We registered some individuals on coral heads.

Domecia hispida Eydoux & Souleyet, 1842 Material examined. Two males (ICMyL MAZ 9059 A) and one female (ICMyL MAZ 9059 B) from Islas Marietas, and two males (ICMyL MAZ 9061) from Pichilinguillo. Remarks. This species is symbiotic with corals of the genus Pocillopora and has a circumtropical distribution (Hendrickx et al. 2005). In the Gulf of California, D. hispida was abundant on corals at Los Islotes (Pereyra 1998). In the Huatulco region the species was recorded by Ramírez-Luna et al. (2002) and some records were done in the Ixtapa region (see Pereyra 1998).We found this species at Pichilinguillo and Islas Marietas, which are new locations in the Mexican tropical Pacific.

Harpiliopsis spinigera Ortmann, 1890 Material examined. This species was common in most sites, in a way similar to its congener. We recorded one male from the Islas Marietas (ICMyL MAZ 9298 A) and one ovigerous female (ICMyL MAZ 9298 C), with two females (ICMyL MAZ 9303 B) and two ovigerous females (ICMyL MAZ 9303 C) from Estacahuite (15 ° 39´N, 96 ° 28´W). Remarks. The presence of this species in Mexican waters was confirmed by Wicksten & Hernández (2000) in the southern Gulf of California. The northernmost sites were from the Loreto area by Hernández et al. (2009). Our study provides new sites along the Mexican coast as far south as Estacahuite, about 1,900 km from the previous records.

Family Palaemonidae Rafinesque, 1815

Trapezia digitalis Latreille, 1828 Material examined. Two males (ICMyL MAZ 9388 A) and three juveniles (ICMyL MAZ 9388 C) from Faro de Bucerías (18 ° 21´N, 103 ° 31´W), and one male (ICMyL MAZ 9385) from La Manzanilla. Remarks. This species is also symbiotic with Pocilloporid corals and has a wide geographic distribution in the Pacific Ocean and the Red Sea (Castro 1997). On the Mexican tropical Pacific coast, T. digitalis was recorded at Zihutanejo (see Pereyra 1998) and the Huatulco region (Ramírez-Luna et al. 2002). In our study we recorded this species in intermediate sites to those previously documented and apparently its abundance is lower than T. bidentata.

Subfamily Pontoniinae Kingsley, 1879

Teleophrys cristulipes Stimpson, 1860 Material examined. One female (ICMyL MAZ 9378) from Islas Marietas and two males (ICMyL MAZ 9384) from Estacahuite. Remarks. This species is well-known in the Gulf of California and along the Mexican tropical Pacific coast (Hendrickx 1999). Our data confirms its presence from Islas Marietas to the Huatulco region.

Alpheus lottini Guérin-Méneville, 1829 Material examined. This species was found at all sampled sites. Vouchers were collected from the Islas Marietas with two males (ICMyL MAZ 9028 A) and two females (ICMyL MAZ 9028 B); as well at Estacahuite, close to the Huatulco region, with one male (ICMyL MAZ 9037 A) and five females (ICMyL MAZ 9037 B). Remarks. This species is commensal on pocilloporid corals and has a wide distribution along the Pacific Ocean and Red Sea (Wicksten & Hendrickx 2003). In Mexican waters, A. lottini was noticed as far north as Isla Coronados (26 °06´N, 111 ° 16´W) in the Loreto area on Pocillopora corals (Hernández et al. 2009), in Bahía Santiago, and in the Huatulco region (Hermoso, 1999). In our study, the species was recorded from all sampled sites along the Mexican tropical Pacific coast.

Eriphia squamata Stimpson, 1860 Material examined. Two records were made at Islas Marietas (CONABIO HJ011 ID 303, 304); three specimens from the Ixtapa region (CONABIO HJ011 ID 20, 42, and 53); one specimen around Isla Roqueta (CONABIO HJ011 ID 2151), and two specimens from La Manzanilla (CONABIO HJ011 ID 1521, 1522). Remarks. This crab has a wide distribution from the Gulf of California to the Galápagos Islands (Villalobos- Hiriat et al. 1989). In the Mexican tropical Pacific waters, the species was recorded at Bahía Navidad (Álvarez del Castillo et al. 1992). Our study confirms its presence in the sampled area and provides new sites on the Mexican coast from Islas Marietas to the Huatulco region.

Synalpheus charon (Heller, 1861) Material examined. New records along the study area were collected at Tenacatita (19 ° 16´N, 104 ° 52´W) with one male (ICMyL MAZ 9370 A) and one female (ICMyL MAZ 9370 B), and at La Ensenada, in Caleta de Campos region, one male (ICMyL MAZ 9369 A) and one female (ICMyL MAZ 9369 B). Remarks. This species is commensal on Pocillopora corals (Wicksten & Hendrickx 2003) and its range was documented as circumtropical (Wicksten 1983). In Mexican waters the northern-most site was recorded at Isla Carmen (26 °02´N, 111 ° 10´W) in the Loreto region (Hernández et al. 2009). Hermoso (1999) noted this species at Bahía Santiago as well in the Huatulco region. Our data confirm its distribution in two other areas of the Mexican tropical Pacific coast, as a commensal on coral.

Petrolisthes galathinus (Bosc, 1802) Material examined. Two males (ICMyL MAZ 9332 A), one female (ICMyL MAZ 9332 B), and five ovigerous females (ICMyL MAZ 9332 C) from La Cacaluta (15 ° 43´N, 96 ° 30´W) Remarks. This species was recorded on the Central American coast from EL Salvador to Ecuador (Hiller et al. 2004). Our data provide the northern-most distribution in the Eastern Pacific, extending its range about 700 km north, and also represents the first record in Mexican waters.

Family Cryptochiridae Paul´son, 1875

Paguristes anahuacus Glassell, 1938 Material examined. One specimen seen at Isla Cocina (19 ° 33´N, 105 °06´W) (CONABIO HJ011 ID 278). Remarks. This hermit crab has been documented on both shores of the Baja California peninsula (Villalobos- Hiriart et al. 1989). Brusca (1980) mentioned that this species is probably the most abundant hermit crab in the Gulf of California. Our study provides a new site on the Mexican Pacific coast about 750 km south from the previous one.