Pachygrapsus gracilis (de Saussure, 1858 )

Poupin, Joseph, Davie, Peter J. F. & Cexus, Jean-Christophe, 2005, A revision of the genus Pachygrapsus Randall, 1840 (Crustacea: Decapoda: Brachyura, Grapsidae), with special reference to the Southwest Pacific species, Zootaxa 1015 (1), pp. 1-66: 15-18

publication ID

http://doi.org/ 10.11646/zootaxa.1015.1.1

publication LSID

lsid:zoobank.org:pub:67DBD7AA-FA11-4F32-811B-0A9EFF4C668F

persistent identifier

http://treatment.plazi.org/id/6C3D8794-ED49-FFE9-6C1C-FA88FAF4FD08

treatment provided by

Felipe

scientific name

Pachygrapsus gracilis (de Saussure, 1858 )
status

 

Pachygrapsus gracilis (de Saussure, 1858)   ( Figures 4a–e View FIGURE 4 , 14h View FIGURE 14 , 15h View FIGURE 15 )

Metopograpsus gracilis de Saussure, 1858: 443   [27], pl. 2, fig. 15 [type locality: St. Thomas, Virgin Is.].

Grapsus (Leptograpsus) rugulosus von Martens, 1872: 108   ( Cuba), not Leptograpsus rugulosus H. Milne Edwards, 1863   .

Pachygrapsus gracilis   — Verrill, 1908: 324, fig. 6a, b, pl. 12, fig. 2 ( Bermuda). — Rathbun, 1918: 249, pl. 60, fig. 3, pl. 61, fig. 1 ( Bahamas, Jamaica, Puerto Rico, Colombia, Brazil, Bermuda; synonymy); 1921: 445, pl. 40, fig. 1 ( Congo); 1933: 89 ( Puerto Rico). — Capart, 1951: 187, fig. 74, pl. 3, fig. 19 (West Africa). — Monod, 1956: 419, fig. 569 (West Africa). — Holthuis, 1959: 239, pl. 10, fig. 3 ( Suriname). — Chace & Hobbs, 1969: 167, fig. 51, 52j (West Indies; references). — Rodríguez, 1980: 380, pl. 59 ( Venezuela). — Manning & Holthuis, 1981: 233 ( Senegal to Angola; references). — Rodrigues & Brossi­Garcia, 1989: 63, fig. 1–5 ( Brazil). — Melo, 1996: 453, fig. 1 ( Brazil); 1998: 499 ( Brazil).

Type material

One dry specimen ( MHNG, frame n° 190, no record number) (P. J. Schwendinger, pers. comm.)   .

Material Examined

East Atlantic. Angola: Lobito , intertidal in oysters, 2 M 7.8 x 10.0, 9.4 x 12.0 mm, 1 F 9.2 x 12.0 mm, 4 F ov. 6.4 x 7.9–8.5 x 11.1 mm ( MNHN B12903 View Materials )   .

West Atlantic. Florida: Banana river , Cap Canaveral, on rock rubble and oysters, 1.8 m, coll. R. H. Gore, 10 August 1972, 3 M 11.3 x 14.3–14.9 x 19.5 mm, 2 ov. F 7.2 x 10.0, 12.4 x 16.7 mm, 3 F 10.7 x 14.1–13.5 x 14.3 mm ( USNM 170178 View Materials )   . — French Guiana: coll. F. Geay 1906, 1 F 11.5 x 16.0 mm ( MNHN B29570 View Materials ; mixed with specimens of P. transversus   under MNHN B16013 View Materials )   .

Diagnosis

Carapace markedly striated on gastric, hepatic, branchial regions; cardiac, intestinal regions smooth or only with short striae; lateral margins strongly convergent posteriorly, with tooth behind exorbital angle ( Fig. 4a View FIGURE 4 ). Front 0.6 times exorbital width; anterior margin straight ( Fig. 4b View FIGURE 4 ). Infraorbital margin almost smooth, at most slightly granulate; without outer notch ( Fig. 14h View FIGURE 14 ).

Outer face of chelae smooth and regularly convex, sometimes with a faint stria near lower margin, becoming more obvious on outer face of fixed finger; dorsal margin of palm with a weak carina and several oblique striae on inner side; dorsal margin of dactyl tuberculated. Cutting edges of fingers widely gaping, with small triangular teeth; tip of fingers spoon shaped, glabrous ( Fig. 4c View FIGURE 4 ).

Ambulatory legs with few scattered long bristles and longitudinal rows of short setae on carpi, propodi; propodi without brush of setae. P5 merus with lower margin marked by several oblique striae on outer face; with a somewhat more noticeable submedian tubercle ( Fig. 4d View FIGURE 4 ).

Abdominal tergites smooth. Male abdomen with sixth somite broader than telson, sixth somite and telson not forming triangle. G1 bluntly rounded at tip, with short corneous process ( Fig. 15h View FIGURE 15 ).

Colour (from photograph): Carapace light green to cream with transverse lines composed of small violet spots. Chelipeds and ambulatory legs pale violet with numerous darker violet spots. The spots retained on the carapace even after several years in preservative ( Fig. 4a View FIGURE 4 ) is a useful character to recognize the species.

Measurements: medium size; carapace of specimens examined ranging from: males 7.8 x 10.0–14.9 x 19.5 mm; females 6.4 x 7.9–13.5 x 14.3 mm; smallest ovigerous female 6.4 x 7.9 mm.

Distribution

West Atlantic. Argentine, Brazil, French Guiana, Caribbean, Texas. East Atlantic. Senegal to Angola.

Habitat

Intertidal. Among mangrove roots and on river banks near the sea ( Chace & Hobbs, 1969).

Remarks

Pachygrapsus gracilis   is morphologically close to P. loveridgei Chace, 1966   and P. transversus ( Gibbes, 1850)   , both also Atlantic species of similar size, with only one tooth behind the exorbital angle and with the male abdomen not triangular at the tip. The three species have very distinct G1 that should not be confused ( Fig. 15h, i, l View FIGURE 15 ). Pachygrapsus gracilis   is also distinct by the lateral carapace margins being strongly convergent posteriorly, the straight anterior margin of the front, the infraorbital margin being almost smooth and without an outer notch, the upper margin of the dactyl of the chela being tuberculated, the absence of a brush of setae on the propodi of the ambulatory legs, and by its colour pattern, having spots that are retained on the carapace even after several years of preservation.

MHNG

Museum d'Histoire Naturelle

MNHN

Museum National d'Histoire Naturelle

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Grapsidae

Genus

Pachygrapsus

Loc

Pachygrapsus gracilis (de Saussure, 1858 )

Poupin, Joseph, Davie, Peter J. F. & Cexus, Jean-Christophe 2005
2005
Loc

Pachygrapsus gracilis

Melo & G. A 1996: 453
Rodrigues, M. D. & Brossi-Garcia, A. L. 1989: 63
Manning, R. B. & Holthuis, L. B. 1981: 233
Rodriguez, G. 1980: 380
Chace, F. A. & Hobbs, H. H. 1969: 167
Holthuis, L. B. 1959: 239
Monod, T. 1956: 419
Capart, A. 1951: 187
Rathbun, M. J. 1918: 249
Verrill, A. E. 1908: 324
1908
Loc

Grapsus (Leptograpsus) rugulosus von Martens, 1872: 108

Martens von, E. & Dr. J. Gundlach's 1872: 108
1872
Loc

Metopograpsus gracilis de Saussure, 1858: 443

Saussure 1858: 443
1858