PORCELLANIDAE Haworth, 1825

Poupin, Joseph & Lemaitre, Rafael, 2014, Porcellanid crabs from Guadeloupe Island (Crustacea, Decapoda, Anomura), with an updated list of species from the Lesser Antilles, Zoosystema 36 (1), pp. 5-27 : 7-18

Family PORCELLANIDAE Haworth, 1825

Megalobrachium mortenseni Haig, 1962 ( Fig. 2A )

Megalobrachium mortenseni Haig, 1962: 189 , figs 2-5 ( Virgin Islands). — Lira 1997: 105, fig. 30 (Margarita). — Lira et al. 2001: 62 (Margarita). — Werding et al. 2003: 81, tab. 1 (Lesser Antilles).

Not Megalobrachium mortenseni – Rodríguez et al. 2005: 550, pl. 1A.

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS, 2012, 1 ♂ 4.4 × 4.2 mm, MNHN-IU-2013-5215 ; 1 sp., MNHN-IU-2013-5088, st. GR03, lot JL130; 1 ♂ 2.9 × 2.8 mm, MNHN-IU-2013-7145, st. GB30, lot JL1389; 1 ♀ 2.7 × 2.7 mm, 1 sp. broken MNHN-IU-2013-5994, st. GB01, no JL number.

DIAGNOSIS. — Carapace eroded, with transverse ridges on branchial and posterior regions; supra-ocular and external orbital angles unarmed; no epibranchial spine. Carpus of cheliped with granular lobe on proximal half of anterior margin; posterior margin without teeth; dorsal surface with longitudinal rows of deep pits. Chela (palm and fingers) with deep longitudinal grooves on dorsal surface. Merus of ambulatory legs unarmed; carpus unarmed, with two crests on anterior margin; dactylus with five movable spines on posterior margin. Telson composed of seven plates.

REMARKS. — This is the first record of M. mortenseni from Guadeloupe Island.

The small male (2.9 × 2.8 mm, st. GB30, MNHN- IU-2013-7145) has the typical row of pits on the carpus of the cheliped, a characteristic of M. mortenseni . However, contrary to larger specimens, the lateral margins of the carapace are carinated and finely denticulated, and the transverse granulated ridges on the branchial regions of the carapace are very marked. These differences are probably size-related.

The illustration of M. mortenseni in Rodríguez et al. (2005: 550 , pl. 1A) is in fact M. roseum (Rathbun, 1900) . Megalobrachium mortenseni and the eastern Pacific M. erosum (Glassell, 1936), are considered geminate species ( Haig 1962: 191).

HABITAT. — Collected in Guadeloupe, in depths of 6 to 16 m. Some specimens were found on sandy bottom with patches of coral and sea grass beds ( Thalassia , Syringodium ) (st. GB30).

DISTRIBUTION. — Western Atlantic: from Virgin Islands and Lesser Antilles (ICA, Guadeloupe; IOV, Margarita), Honduras, Panama, Colombia, Venezuela to São Paulo, Brazil.

Megalobrachium poeyi (Guérin-Méneville, 1855) ( Fig. 2B )

Porcellana poeyi Guérin-Méneville, 1855 : pl. 2, fig. 4 (type locality: Cuba).

Megalobrachium granuliferum – Stimpson 1858: 228, nomen nudum; 1859: 76 (type locality: Virgin Islands, St Thomas, and Barbados). — Doflein 1899: 182 ( Martinique) .

Megalobrachium poeyi – Schmitt 1924a: 76 ( Curaçao); 1924b: 90 (Pelican Island, Antigua and Barbuda); 1936: 375 ( Aruba). — Haig 1962: 188 ( Virgin Islands, Tobago). — Lira 1997: 108, fig. 31 (Margarita). — Lira et al. 2001: 58 (Coche, Margarita, Cubagua); 2012: 27 (La Tortuga). — Werding et al. 2003: 81, tab. 1 (Lesser Antilles). — Rodríguez et al. 2005: 551 (Margarita).

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS, 2012, 1 ♂ 3.5 × 3.5 mm, MNHN-IU-2013-5297, st. GM06, lot JL245 ; 1 ♂ 3.5 × 3.5 mm, MNHN- IU-2013-5081, st. GM06, lot JL279b.

DIAGNOSIS. — Carapace smooth with few granules, protogastric region elevated, lateral margins setiferous; supra-ocular and external orbital angles unarmed; no epibranchial spine. Carpus of cheliped with anterior margin straight, minutely serrated but without spines or teeth; posterior margin minutely serrated, with plumose setae; dorsal surface granulated, with two longitudinal ridges. Chela granulated, with two longitudinal ridges on dorsal surface; anterior margin with long plumose setae; gape of fingers with setae. Ambulatory legs heavily setose; dactylus with four movables spines on posterior margin. Telson composed of seven plates.

REMARKS. — This is the first record of M. poeyi from Guadeloupe Island.

The presence of abundant setation on the chelipeds and ambulatory legs is a reliable character to separate M. poeyi from M. roseum , a similar species found in the western Atlantic (see Rodríguez et al. 2005: 550, Pl. 1B, C).

Megalobrachium poeyi and the eastern Pacific M. pacificum Gore & Abele, 1974 , are considered geminate species ( Gore & Abele 1974: 570; 1976: 17).

HABITAT. — Collected in the intertidal of “Îlet Fortune” during low tide, on rocks and coral rubble.

DISTRIBUTION. — Western Atlantic: from eastern Florida, USA, Gulf of Mexico, Greater Antilles, Virgin Islands and Lesser Antilles (ICA, Pelican Island at Antigua and Barbuda, Guadeloupe, Martinique, Barbabos, Tobago; IOV, Coche, Margarita, Cubagua, Curaçao, Aruba), Panama, Colombia, Venezuela to São Paulo, Brazil.

Megalobrachium soriatum ( Say, 1818) ( Fig. 2C )

Porcellana soriata Say, 1818: 456 (type locality: St. Catherine’s Island, Georgia).— Schmitt 1924b: 90 ( Barbados).

Megalobrachium soriatum – Lira 1997: 102, fig. 29 (Margarita). — Lira et al. 2001: 56 (Margarita). — Werding et al. 2003: 81, tab. 1 (Lesser Antilles). — Rodríguez et al. 2005: 552 ( Martinique).

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS, 2012, 1 ♂ 2.6 × 2.8 mm, MNHN-IU-2013-5083, st. GR12, lot JL434.

DIAGNOSIS. — Carapace areolated on gastric and branchial regions; lateral margin with three mesobranchial spinules; supra-ocular and external orbital angles unarmed; epibranchial region with subacute tubercle. Carpus of cheliped with blunt tooth on proximal half of anterior margin; posterior margin emarginated, dorsal surface with granular tubercles arranged in longitudinal rows. Palm with longitudinal rows of granular tubercles on dorsal surface, anterior margin with spinules and row of long plumose setae, gape of fingers without setae. Ambulatory legs setose; dactyl curved; with three movable spines on posterior margin. Telson composed of five plates.

REMARKS. — This is the first record of M. soriatum from Guadeloupe Island.

Megalobrachium soriatum and the eastern Pacific Megalobrachium tuberculipes (Lockington, 1878) differ only slightly in morphology, and are considered geminate species (Gore & Abele 1976). In the western Atlantic, molecular data by Rodríguez et al. (2006) suggest the existence of a cryptic species under M. soriatum .

HABITAT. — Collected at depth of 21 m, on rocky bottom with sessile organisms.Sometimes reported inside sponges ( Haig 1956: 36; Williams 1984: 241).

DISTRIBUTION. — Western Atlantic: from North Carolina, USA, Gulf of Mexico, Lesser Antilles (ICA, Guadeloupe, Martinique, Barbados; IOV, Margarita), Panama, Colombia, to São Paulo, Brazil.

Neopisosoma angustifrons ( Benedict, 1901) ( Fig. 2D )

Pisosoma angustifrons Benedict, 1901: 135 , pl. 3, fig. 6 (type locality: Trinidad). — Schmitt 1924a: 74 ( Curaçao); 1936: 374 ( Bonaire). — Monod 1939: 559 (Guadeloupe). — Haig 1956: 15 (Cubagua, La Tortuga). — Rodríguez 1980: 214, pl. 2 (Margarita). — Lira 1997: 54, fig. 14 (Margarita).

Neopisosoma angustifrons – Haig 1962: 181 ( Virgin Islands). — Werding 1986: 162 (Saba, St Eustatius, Grenada, Trinidad, Bonaire, Curaçao, Aruba). — Lira 1997: 54, fig. 14 (Margarita). — Werding et al. 2003: 81, tab. 1 (Lesser Antilles). — Rodríguez et al. 2005: 553 (Cubagua).

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS, 2012, 1 ♂ 3.2 × 3.6 mm, MNHN-IU-2013-5588, st. GM08, lot JL400.

DIAGNOSIS. — Carapace sub-oval, granulated; supra-ocular and external orbital angles unarmed; epibranchial region unarmed; pterygostomian flap entire but incomplete, mesobranchial portion occupied by membrane.Chelipeds thick, completely covered with rounded granules but without setae; carpus with five obtuse teeth on anterior margin; posterior margin convex, granulated; dorsal surface of palm with granules arranged in longitudinal rows; anterior margin granulated. Ambulatory legs short, robust, without setation; merus and carpus unarmed; dactylus curved, with three movable spines on posterior margin. Telson composed of five plates.

REMARKS. — This species is easily recognizable by the thick chelipeds, completely covered with rounded granules but no setae. The eastern Pacific geminate of N. angustifrons is N. dohenyi Haig, 1960 (see Haig 1960: 131).

HABITAT. — Collected in the lower intertidal region at low tide, on rocks and coral rubble.

DISTRIBUTION. — Western Atlantic: from Florida, USA, Bahamas, Greater Antilles, Virgin Islands and Lesser Antilles (ICA, Saba, St Eustatius, Guadeloupe, Trinidad; IOV, Margarita, Cubagua, LaTortuga, Bonaire, Curaçao, Aruba), Mexico to Venezuela.

Neopisosoma curacaoense (Schmitt, 1924) ( Fig. 2E )

Pisosoma curaçaoensis Schmitt, 1924a: 75 , pl. 8, figs 1-3, (type locality: Lesser Antilles , Curaçao); 1936: 374 ( Bonaire).

Pisosoma curacaoense – Haig 1956: 15 (La Tortuga, Aruba).

Neopisosoma curacaoense – Haig 1962: 181 ( Virgin Islands). — Scelzo 1984: 374 (Cubagua). — Werding 1986: 162 ( Saba, St Martin, St Eustatius, Grenada, Aruba). — Werding et al. 2003: 81, tab. 1 (Lesser Antilles).

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS, 2012, 1 ♀ 4.2 × 4.0 mm, MNHN-IU-2013-5359, st. GM08, lot JL399.

DIAGNOSIS. — Carapace subquadrate, slightly rugose; lateral margins feebly carinated; supra-ocular and external orbital angles unarmed; epibranchial region unarmed; pterygostomian flap entire but incomplete, mesobranchial portion occupied by a membrane. Carpus of cheliped with four blunt large teeth and one or two smaller distal teeth on anterior margin; posterior margin unarmed, with cotton-like setation on distal third; dorsal surface with three longitudinal ridges. Dorsal surface of chela with two longitudinal ridges on inner half; outer half, including fixed finger, covered with cotton-like setation; gape of fingers without setae. Ambulatory legs densely covered on anterior margins with cotton-like setation; merus and carpus unarmed; dactylus curved, with four movable spines on posterior margin. Telson composed of five-seven plates.

REMARKS. — This is the first record of N. curacaoense from Guadeloupe Island.

This species is remarkable in having the cotton-like setation on the chelipeds and ambulatory legs, a character unique in the western Atlantic Neopisosoma species (see key in Werding 1986).

HABITAT. — Collected in the lower intertidal region at low tide, on rocks and coral rubble.

DISTRIBUTION. — Western Atlantic: Bahamas, Greater Antilles, Virgin Islands and Lesser Antilles (ICA, Saba, St Martin, St Eustatius, Guadeloupe, Grenada; IOV, Cubagua, La Tortuga, Bonaire, Curaçao, Aruba), to Mexico (but see remarks in Rodríguez et al. 2005 for this country).

Pachycheles pilosus (H. Milne Edwards, 1837) ( Fig. 2F )

Porcellana pilosa H. Milne Edwards, 1837: 225 (type locality: Charleston, South Carolina). — A. Milne- Edwards & Bouvier 1923: 294 ( St Thomas).

Pachycheles pilosus – Schmitt 1924a: 76 ( Curaçao); 1924b: 90 ( Barbados); 1936: 375 ( Aruba, Bonaire). — Monod 1939: 559 ( Guadeloupe). — Haig 1956: 11 ( Tobago, Aruba). — Scelzo & Varela 1988: 39, fig. 2 (La Blanquilla). — Werding et al. 2003: 81, tab. 1 (Lesser Antilles). — Rodríguez et al. 2005: 556 (La Tortuga). — Lira et al. 2007: 38 (La Blanquilla, La Tortuga, Aves).

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS, 2012, 1 ♀ 3.8 × 4.0 mm, MNHN-IU-2013-4924, st. GM07, lot JL357 ; 1 ♀ ov 5.0 × 5.4 mm, MNHN- IU-2013-5293, st. GM10, lot JL561.

DIAGNOSIS. — Carapace entirely covered with short and stiff bristles more or less arranged in transverse rows; supraocular angle unarmed, external orbital angle with one spine, epibranchial region unarmed; pterygostomian flap of carapace broken up into two main pieces separated by membranous interspace. Chelipeds thickly covered with long and stiff bristles on dorsal face; carpus with three large spines on anterior margin,posterior margin unarmed, dorsal surface with seven or eight blunt spines on proximal outer half; anterior margin of palm with row of 10 or 11 spines, continuing onto fixed finger; gape of fingers with a few sparse setae. Ambulatory legs with stiff bristles on anterior margins; merus unarmed; carpus with two (legs 1-2) or 1 (leg 3) anterodistal spine;dactylus curved,with three movable spines on posterior margin.Telson composed of five plates.

REMARKS. — This species is distinguished from all others western Atlantic species by the numerous stiff bristles which cover the carapace, chelipeds and ambulatory legs (see key in Lira et al. 2007).

HABITAT. — Collected in the low intertidal region at low tide, on rocks and coral rubble.

DISTRIBUTION. — Western Atlantic:from South Carolina, USA, Bahamas, Greater Antilles, Virgin Islands and Lesser Antilles (ICA, Guadeloupe, Barbados, Tobago; IOV, La Blanquilla, La Tortuga, Aves, Bonaire, Curaçao, Aruba), Mexico, Colombia, to Venezuela.

Parapetrolisthes tortugensis ( Glassell, 1945) ( Fig. 2G )

Petrolisthes tortugensis Glassell, 1945: 228 , fig. 2 (type locality: Tortugas, Florida).— Haig 1956: 22 (La Tortuga).

Parapetrolisthes tortugensis – Haig 1962: 174 ( Virgin Islands). — Werding et al. 2003: 81, table 1 (Lesser Antilles).

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS, 2012, 1 ♂ 4.6 × 4.3 mm, MNHN-IU-2013-5590, st. GB21, lot JL1097.

DIAGNOSIS. — Carapace with transverse setiferous striae; front bluntly triangular bearing short spines on lateral and distal margins; supra-ocular angle with one acute spine, external orbital angle with one short spine; one epibranchial spine; mesobranchial region with one dorsal spine and two lateral marginal spines. Cheliped long, about 2.5 times carapace length; carpus with four sharp spines on anterior margin, posterior margin with row of six inwardly curved spines, dorsal face with setiferous squamae and longitudinal row of two median spines proximally. Chelae with a row of inwardly curved spines on posterior margin continued on dactyl; anterior margin with double row of inwardly curved spines continued on fixed finger; palm granulated on dorsal surface, ventral face with oblique ridges; fingers with setae on gape, tips spoon-shaped. Merus of ambulatory legs with row of five-eight spines on anterior margin; carpus with one anterodistal spine (leg 1) or unarmed (leg 2-3); dactylus with four movable spines on posterior margin. Telson composed of seven plates.

REMARKS. — This is the first record of P. tortugensis from Guadeloupe Island.

Parapetrolisthes tortugensis is easily differentiated from all the others porcelain crabs of the Western Atlantic by the spoon-shaped aspect of the finger tips of the chela (see Werding 1982, fig. 2).

HABITAT. — A sole specimen was collected by brushing coral rubble and stones at a depth of 8 m. Werding (1982) indicated that P. tortugensis was not collected in the Islas del Rosario at depths of less than 9 m, and seemed to prefer deeper areas. The maximum collection depth of the species reported by Felder et al. (2009) was 54 m.

DISTRIBUTION. — Western Atlantic: from Florida, USA, Bahamas, Virgin Islands and Lesser Antilles (ICA, Guadeloupe; IOV, La Tortuga), Mexico (Campeche Bank), to Colombia.

Petrolisthes amoenus (Guérin-Méneville, 1855) ( Fig. 3A )

Porcellana amoena Guérin-Méneville, 1855 , pl. 2, fig. 2 (type locality: Cuba).

Petrolisthes amoenus – Haig 1956: 25 ( Tobago); 1962: 177 ( Virgin Islands, Tobago). — Schmitt 1924a: 74 ( Curaçao); 1924b: 89 ( Barbados); 1936: 374 ( Bonaire). — Chace 1956: 152 (Los Roques). — Gore 1974: 707, fig. 3 ( Antigua, St Lucia, Grenada). — Werding et al. 2003: 81, tab. 1 (Lesser Antilles). — Rodríguez et al. 2005: 559 (Cubagua). — Lira et al. 2012: 27 (La Tortuga).

MATERIAL EXAMINED. — Guadeloupe. KARUBEN- THOS, 2012, 1 sp. MNHN-IU-2013-4783, st. GB01, no JL number ; 1 sp. MNHN-IU-2013-5214, 1 sp. MNHN-IU-2013-5442, st. GB02, lot JL190; 1 sp. MNHN-IU-2013-5091, st. GB02, lot JL193; 1 sp. MNHN-IU-2013-5089, st. GB02, lot JL199; 4 sp. MNHN-IU-2013-6806, st. GB06, lot JL452; 1♂ 6.8 × 6.5 mm, MNHN-IU-2013-5294, st. GB06, lot JL459; 4 ♀♀ 3.6 × 3.4-7.0 × 6.9 mm, MNHN-IU-2013-5078, st. GB09, lot JL565; 1 ♀ ov. 5.8 × 5.7 mm, MNHN- IU-2013-5424, st. GB15, lot JL833; 1 sp. about 5.0 × 4.7 mm, MNHN-IU-2013-5357, st. GB15, lot JL869; 1 sp., MNHN-IU-2013-5993, st. GB15, lot JL280b; 1 sp. MNHN-IU-2013-5594, st. GB18, lot JL956; 6 sp. MNHN-IU-2013-5211, st. GB19, lot JL985; 1 sp. MNHN-IU-2013-5589, st. GB20, lot JL1067b; 10 sp. MNHN-IU-2013-6791, st. GB20, lot JL1069; 1 sp. MNHN-IU-2013-7149, st. GB20, lot JL1092; 8 sp. MNHN-IU-2013-5075, 1 sp. MNHN-IU-2013-5079, st. GB22, lot JL1113; 4 juv. MNHN-IU-2013-5426, st. GB23, lot JL1119; 1 ♀ ov., MNHN-IU-2013-5356, st. GB26, lot JL1272; 7 sp., MNHN-IU-2013-6811, st. GB31, lot JL1430; 2 ♂♂ 6.1 × 5.9-6.5 × 6.1 mm, MNHN-IU-2013-5295, st. GD66, lot JL1439; 12 juv. MNHN-IU-2013-5052, st. GM12, lot JL652; 1 juv. MNHN-IU-2013-5358, st. GM21, lot JL942; 1 ♀ ov. 5.0 × 4.7 mm, MNHN-IU-2013-7152, st. GR12, lot JL443; 1 ♂ 4.2 × 3.8-4.9 × 4.6 mm, 1 ♀ 3.6 × 3.2 mm, MNHN-IU-2013-6797, st. GR32, lot JL1058.

DIAGNOSIS. — Carapace almost smooth, without setae or sparsely setose; front subtriangular, with numerous spinules on margins; supra-ocular and external orbital angles each armed with spine; one epibranchial spine, two (rarely one or three) mesobranchial spines. Carpus of cheliped with four or five broad, serrated teeth on anterior margin and with five or six inwardly curved spines on posterior margin. Palm of cheliped with long feathered setae and row of forwardly directed spines on anterior margin; gape of fingers with short pubescence covering proximal half of dactylus and proximal angle of pollex (not visible from above). Meri of ambulatory legs each with row of six or seven (legs 1-2) and five (leg 3) spines on anterior margin; carpus with one anterodistal spine (leg 1), unarmed or one spine (leg 2) or unarmed (leg 3); dactylus with three movable spines on posterior margin. Telson composed of seven plates.

REMARKS. — This is the first record of P. amoenus from Guadeloupe Island.

This was the most commonly collected porcellanid species during KARUBENTHOS fieldwork. The large series of specimens examined are overall similar to those already described and illustrated by Gore (1974: fig. 3) from other Lesser Antilles ( Antigua, St Lucia, Grenada). Live coloration ( Fig.3A ) turned to cream background scattered with pink spots after preservation. Other colorations useful to quickly sort preserved specimens of this species are: 1) two white rings separated by a narrow brown median line on the proximal and distal portions of the propodus of each ambulatory leg; and 2) a remarkable dark pink spot in the middle portion of the propodus of the third maxilliped.

HABITAT. — Mostly collected by brushing coral heads and rubble in the outer reef slope at depths of 6-45 m (st. GB); rarely collected with dredge (st. GD66, 33 m) or on coral bottom in shallow waters, at depths of 2-3 m (st. GM12, GM21). In other islands of the Lesser Antilles, Gore (1974) indicated that P. amoenus was collected at depths of 13- 22 m.

DISTRIBUTION. — Western Atlantic: from Florida Straits, USA, Greater Antilles, Virgin Islands and Lesser Antilles (ICA, Antigua, Guadeloupe, St Lucia, Barbados, Grenada, Tobago; IOV, Cubagua, LaTortuga, Los Roques, Bonaire, Curaçao), Mexico, Colombia, Venezuela, to Alagôas and Bahia, Brazil.

Petrolisthes armatus ( Gibbes, 1850) ( Fig. 3B, C )

Porcellana armata Gibbes, 1850: 190 (type locality: Florida).

Petrolisthes armatus – Stimpson 1859: 73 ( Virgin Islands). — Rathbun 1919: 11 ( Curaçao). — Haig 1962: 178 ( Virgin Islands). — Gore 1974: 709 ( Trinidad). — Rodríguez 1980: 217, pl. 3 (Margarita). — Scelzo & Varela 1988: 40 (La Blanquilla). — Lira 1997: 91, fig. 26 (Margarita). — Hernández et al. 1999: 27, tab. 1 (Margarita). — Werding et al. 2003: 81, tab. 1 (Lesser Antilles). — Rodríguez et al. 2005: 560 (Margarita, Cubagua). — Lira et al. 2012: 26 (La Tortuga).

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS, 2012, 2 sp., MNHN-IU-2013-5074, st. GM03, lot JL81 ; 1 ♀ ov. 8.4 × 7.9 mm, MNHN-IU-2013-5082, st. GM03, lot JL82; 1 sp., MNHN-IU-2013-6796, st. GM03, st. JL114; 6 sp. 5.3 × 4.7-8.1 × 7.9 mm, MNHN-IU-2013-5084, st. GM03, lot JL115; 1 sp., MNHN-IU-2013-5213, st. GM26, lot JL1197; 1 ♂ 7.0 × 6.5 mm, MNHN-IU-2013-5085, st. GM05, lot JL187; 1 ♂ 6.8 × 6.2 mm, MNHN-IU-2013-6859, st. GM05, lot JL187.

DIAGNOSIS. — Carapace rugose with protogastric ridge elevated; supra-ocular and external orbital angles unarmed, one acute epibranchial spine. Carpus of cheliped anteriorly with three low distant, spine-tipped teeth minutely denticulated on edges; posterior margin setiferous, with three-five inwardly curved spines; dorsal surface transversally rugose. Dorsal surface of chela granulated; anterior margin of palm setiferous, usually with row of six-ten forwardly curved spines; gape of fingers with cotton-like setation (not visible from dorsal view). Ambulatory legs with or without plumose setae on anterior margins of merus and carpus; merus with three or four spines on anterior margin; carpus with one anterodistal spine (legs 1-2) or unarmed (leg 3); dactylus with three movable spines on posterior margin. Telson composed of seven plates

REMARKS. — This is the first record of P. armatus from Guadeloupe Island.

Rodríguez et al. (2005) indicated that P.armatus is the most widespread species in the western Atlantic, and also considered its distribution to include the eastern Pacific and eastern Atlantic. These authors also mentioned that populations of P. armatus show considerable morphological variations, and that this taxon might actually be a complex of species. The following morphological variations were observed in the material examined: the armature on the anterior margin of the palm of the chela is sometimes reduced to one or two very low spines, with the setation of this margin sometimes absent; and the setation of the anterior margins of the merus and carpus of the ambulatory legs can be absent. The color patterns of the carapace,chelae and ambulatory legs,were also observed to vary, such as in specimens collected at st. GM03 and st. GM05 (compare Fig. 3B, C ), although the color patterns of the antennule (blue and orange) and dactylus of the third maxilliped (brown and yellow) are constant.

HABITAT. — Collected in the intertidal region at low tide, on eutrophic shores with mud and coral rubble (GM03) and in mangrove (GM05). A few specimens from GM03, a station obviously polluted, show unilateral morphological abnormalities on a single chela. A similar case of malformation has been documented by Lira et al. (2003) for Pachycheles serratus .

DISTRIBUTION. — Western and eastern Atlantic; eastern Pacific.Widespread in western Atlantic: from Connecticut, USA, Bermudas, Bahamas, Greater Antilles, Virgin Islands and Lesser Antilles (ICA, Guadeloupe, Trinidad; IOV, Margarita, Cubagua, La Blanquilla, La Tortuga, Curaçao), to Santa Catarina, Brazil.

Petrolisthes caribensis Werding, 1983 ( Fig. 3D )

Petrolisthes caribensis Werding, 1983: 411 , figs 1, 4 (type locality: Rosario Islands, Colombia). — Werding et al. 2003: 81, tab. 1 (Lesser Antilles).

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS, 2012, 1 ♀ ov 4.1 × 3.8 mm, MNHN-IU-2013-5212, st. GB02, lot JL200 ; 1 ♂ juv. 3.1 × 2.7 mm, MNHN- IU-2013-7153, st. GB30, lot JL1389; 1 ♂ 5.5 × 5.3 mm, MNHN-IU-2013-4978, st. GB32, lot JL1461; 2 sp. MNHN-IU-2013-5296, st. GB32, lot JL1424.

DIAGNOSIS. — Carapace with strong, transverse, setiferous striae; supra-ocular and external orbital angles armed with one spine; one epibranchial spine; front sinuously triangular, with minute spines on margins. Carpus of cheliped anteriorly with four large pointed teeth serrated on edges; posterior margin with five or six forwardly curved sharp spines; dorsal face with transverse striae. Palm striated on dorsal surface; anterior margin setiferous, serrated (extended onto fixed finger), with parallel row of forwardly curved spines on antero-dorsal margin (not extended onto fixed finger); posterior margin of palm with one or two dorsodistal spines; gape of fingers setiferous, not visible from dorsal view. Ambulatory legs weakly setiferous on anterior margins; merus with row of four-eight spines on anterior margin; carpus with one anterodistal spine; dactylus with four movable spines on posterior margin. Telson composed of seven plates.

REMARKS. — This is the first record of P. caribensis from Guadeloupe Island.

Petrolisthes caribensis belongs to the P. galathinus complex of species. It is distinctive by the typical carmine background color with symmetrical white patches on the carapace ( Werding 1983: 412). In addition, in the specimens examined, the third maxilliped has remarkable red longitudinal stripes on the carpus, a bright sky blue color on the propodus and dactylus, and a darker blue patch in the middle of the propodus (see Fig. 3D ). There is also a longitudinal red stripe pattern on the carpus and propodus of each ambulatory leg. The bright carmine background color of the carapace can be sometimes replaced by a duller maroon-green color (unpublished color photograph, com. pers. A. Hiller), but the color pattern of the third maxilliped and ambulatory legs appears to be constant. The specimen of P. caribensis from Panama illustrated in color by Rodríguez et al. (2005: 550, pl. 1G) is obviously erroneously labeled because it shows the typical coloration of P. galathinus . More detailed color documentation of species of the P. galathinus complex can be viewed at the link provided by Hiller et al. (2006: 549, http://www.uni-giessen.de/ porcellanidae /). This includes P. caribensis with typical carmine color morph and a color variation named P. caribensis “Blue ” which, according to Hiller et al. (2006) probably belongs to a distinct undescribed species.

When no live coloration is available, P. caribensis can be confused with P. galathinus , both sharing many morphological characters (see Werding 1983: 408, tab. 1). The best character to distinguish these two closely similar species is the number of movable spines on posterior margin of the dactylus of the ambulatory legs: three spines in P. galathinus instead of four spines in P. caribensis .

HABITAT. — Coral bottoms. Collected by brushing coral heads and rubble in shallow waters (4 m) and on outer reef slope (11 m). DISTRIBUTION. — Western Atlantic: from Florida Keys, Greater Antilles, Lesser Antilles ( Werding et al. 2003; com. pers. A. Hiller; ICA, St Martin, Guadeloupe, Martinique; IOV, Bonaire, Curaçao), Mexico, Belize, Panama, Colombia, to Venezuela.

Petrolisthes dissimulatus Gore, 1983 ( Fig. 3E )

Petrolisthes dissimulatus Gore, 1983: 94 , figs 2-4 (type locality: St John, Virgin Islands; Barbados, Curaçao). — Werding et al. 2003: 81, tab. 1 (Lesser Antilles). — Rodríguez et al. 2005: 561 ( Martinique).

Petrolisthes marginatus – Schmitt 1924a: 73 ( Curaçao); 1924b: 88 ( Barbados). — Haig 1956: 17, 26 (in part, Curaçao); 1962: 176 (in part, Virgin Islands). Not P. marginatus Stimpson, 1859 .

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS, 2012, 1 ♀ 3.7 × 3.5 mm, MNHN-IU-2013-7154, st. GM07, lot JL368.

DIAGNOSIS. — Carapace smooth, faintly pubescent; frontal region trilobate, median lobe rounded and denticulated, lateral lobe rectangularly rounded, serrated; supra-ocular angle serrated, without spine, external orbital angle with small spine, epibranchial region with two spines. Carpus of cheliped with four (right) or five (left) serrated teeth on anterior margin and six-eight inwardly curved spines on posterior margin; dorsal surface with median row of seven or eight squamous tubercles. Dorsal surface of palm with fine pubescence on outer half and longitudinal crest of low granules between dactylar and carpal articulations; anterior margin with row of low forwardly directed spines; posterior margin with two dorsodistal curved spines; gape of fingers with a few short setae but not obviously pubescent. Merus of ambulatory legs with row of four-six spines on anterior margin; carpus with one anterodistal spine (legs 1-2) or unarmed (leg 3); dactylus with three movable spines on posterior margin. Telson composed of seven plates.

REMARKS. — This is the first record of P. dissimulatus from Guadeloupe Island.

The present small sole specimen was mixed with a lot of several species of Paguridae at st. GM07. It is illustrated on Fig. 3E but its live coloration was not recorded. Gore (1983: 98) mentioned a pink coloration on the live specimens examined by Benedict (1901). Morphological characters of the present Guadeloupe specimen overall fit those given and illustrated by Gore (1983: figs 2, 3) for the description of P. dissimulatus , especially the median longitudinal crests on the dorsal surfaces of the carpus and palm of the chelipeds, and the presence of two epibranchial spines on the carapace. Petrolisthes marginatus is closely similar to P.dissimulatus but it differs from the latter species in having a single epibranchial spine instead of two.

HABITAT. — Collected in the intertidal region at low tide among rocks and coral rubble.

DISTRIBUTION. — Western Atlantic: from Greater Antilles, Virgin Island and Lesser Antilles (ICA, Guadeloupe, Martinique, Barbados; IOV, Curaçao), Colombia, to Venezuela.

Petrolisthes galathinus ( Bosc, 1802) ( Fig. 3F, G )

Porcellana galathina Bosc, 1802: 231-233 , pl. 6, fig. 2 (type locality: unknown).

Petrolisthes galatinus – Nobili 1898: 2 ( St Thomas, Virgin Islands)

Petrolisthes galathinus – Schmitt 1924b: 88 ( Barbados); 1936: 374 ( Aruba, Bonaire). — Rathbun 1919: 11 ( Curaçao). — Chace 1956: 152 (Los Roques). — Haig 1956: 24 ( Trinidad, Cubagua); 1962: 175 ( Virgin Islands, Tobago). — Gore 1974: 715 (Guadeloupe). — Rodríguez 1980: 217, pl. 5 (Margarita). — Lira 1997: 95, fig. 27 (Margarita). — Hernández et al. 1999: 27, tab. 1 (Margarita). — Werding et al. 2003: 81, tab. 1 (Lesser Antilles). — Rodríguez et al. 2005: 560 (Margarita, Cubagua). — Lira et al. 2012: 26, fig. 3C (La Tortuga).

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS, 2012, 1 ♂ 7.9 × 7.9 mm, MNHN-IU-2013-5087, 1 ♀ ov. 6.0 × 6.0 mm, MNHN-IU-2013-6861, 3 sp., MNHN-IU-2013-5216, st. GM06, lot JL248 ; 1 ♂ 9.0 × 9.0 mm, MNHN-IU-2013-6807, st. GM06, lot JL293; 1 sp., MNHN-IU-2013-5086, st. GM06, lot JL294, 1 sp., MNHN-IU-2013-5090, st. GM06, lot JL295; 2 ♂♂ 5.5 × 5.5-8.2 × 8.0 mm, 1 ♀ 7.4 × 7.3 mm, MNHN-IU-2013-4979, st. GM06, lot JL279; 1 sp. MNHN-IU-2013-5592, st. GM06, no JL number; 1 ♀ 7.2 × 7.2 mm, MNHN-IU-2013-6808, st. GM11, lot J 692; 1 ♀, MNHN-IU-2013-4977, st. GM11, lot JL692; 20 sp. 4.4 × 4.4-6.6 × 6.6 mm, MNHN- IU-2013-5060, st. GM11, lot JL692; 1 ♂ 4.8 × 4.5 mm, MNHN-IU-2013-7155, st. GB01, lot JL103b.

ADDITIONAL OBSERVATION. — Guadeloupe, KARU- BENTHOS, 2012, 1 sp. st. GM10, lot JL573, photo only ( Fig. 3G ), specimen not retrieved. Color variety of P. galathinus “White Teeth 2” in Hiller et al. (2006: 556, tab. 3 and http://www.uni-giessen.de/ porcellanidae /).

REMARKS. — The diagnosis of this species is similar to that of P.caribensis , another species of the P.galathinus complex. The only diagnostic difference is that in P. galathinus the posterior margin of the palm lacks any distinct spines whereas one or two dorsodistal spines are present in P. caribensis ; and the dactylus of the ambulatory legs has three movable spines on the posterior margin, whereas there are four spines in P. caribensis . The two species can also be easily separated when live coloration is available (compare Figs. 3D and 3F, G ).

The P. galathinus complex currently includes six species in the southern Caribbean: P. bolivarensis Werding & Kraus, 2003 , P. caribensis , P. columbiensis Werding, 1983 , P. galathinus , P. rosariensis Werding, 1978 , and P. sanmartini Werding & Hiller, 2002 . Werding (1983: 408 tab. 1) and Hiller et al. (2006: 549, tab. 1) listed a few key morphological characters to distinguish these species. Hiller et al. (2006) identified three distinct color morphs in P. galathinus , namely “White teeth”, “Spots”, and “Stripes”. The “White teeth 2” color morph was recognized during this study in specimens from st. GM10 (see Additional observation and Fig. 3G ).

HABITAT. — Most of the specimens of this species were collected at st. GM06, Îlet Fortune, at low tide, on coral rubble and tide pools. Petrolisthes galathinus was also abundant on the coral reef platform at low tide around the Îlet Cabrit. Some specimens were also collected by brushing coral heads in depths of 4- 6 m.

DISTRIBUTION. — Western Atlantic and eastern Pacific. In western Atlantic: from Cap Hatteras, USA, Greater Antilles; Virgin Islands and Lesser Antilles (ICA, Guadeloupe, Barbados; IOV, Margarita, Cubagua, La Tortuga, Los Roques, Bonaire, Curaçao, Aruba), Venezuela, to Santa Catarina, Brazil.

Figures

FIG. 2. — A, Megalobrachium mortenseni Haig, 1962, 1 ♂ 4.4 × 4.2 mm, MNHN-IU-2013-5215, st. GR03 (preserved specimen); B, Megalobrachium poeyi (Guérin-Méneville,1855), 1 ♂ 3.5 × 3.5 mm, MNHN-IU-2013-5297, st. GM06; C, Megalobrachium soriatum (Say,1818),1 ♂ 2.6 × 2.8 mm,MNHN-IU-2013-5083 (preserved specimen),st. GR12;D, Neopisosoma angustifrons (Benedict,1901),1 ♂ 3.2 × 3.6 mm,MNHN-IU-2013-5588,st.GM08;E, Neopisosoma curacaoense (Schmitt,1924),1 ♀ 4.2 × 4.0 mm, MNHN-IU-2013-5359, st. GM08; F, Pachycheles pilosus (H. Milne Edwards, 1837),1 ♀ 3.8 × 4.0 mm, MNHN-IU-2013-4924. st. GM07; G, Parapetrolisthes tortugensis (Glassell, 1945), 1 ♂ 4.6 × 4.3 mm, MNHN-IU-2013-5590, st. GB21. Magnifications are about ×5 for each species.

FIG. 3. — A, Petrolisthes amoenus (Guérin-Méneville,1955),1 sp.about 5.0 × 4.7 mm,MNHN-IU-2013-5357,st.GB15;Petrolisthes armatus (Gibbes,1850);B, 1 ♀ov.8.4 × 7.9 mm,MNHN-IU-2013-5082,st.GM03;C, 1 ♂7.0 × 6.5 mm,MNHN-IU-2013-5085,st.GM05;D, Petrolisthes caribensis Werding, 1983, 1 ♂ 5.5 × 5.3 mm, MNHN-IU-2013-4978, st. GB32; E, Petrolisthes dissimulatus Gore, 1983, 1 ♀ 3.7 × 3.5 mm, MNHN-IU-2013-7154,st.GM07;Petrolisthes galathinus; F, 1 ♀ 7.2 × 7.2 mm,MNHN-IU-2013-6808,st.GM11;G, color variety of P.galathinus (Bosc, 1802) “White Teeth 2”, st. GM10,lot JL573, photo only, specimen not retrieved. Magnification is about × 3 for each species.