Pachycheles monilifer (Dana, 1852)

Ferreira, Luciane Augusto De Azevedo & Melo, Gustavo Augusto Schmidt De, 2016, Porcelain crabs from Brazil (Crustacea: Decapoda: Anomura: Porcellanidae), Zootaxa 4092 (2), pp. 175-194 : 182-183

Pachycheles monilifer (Dana, 1852)

( Fig. 2 A)

Porcellana rugosimanus White, 1847: 63 [nomen nudum].

Porcellana monilifera Dana, 1852: 413 ; 1855, plate 26, figure 3 (type-locality: Rio de Janeiro, Brazil). Pachycheles moniliferus —Stimpson, 1858: 228.

Pachycheles monilifer —Rathbun, 1900: 148.

Material examined. Venezuela: Cubagua Island (MZUSP-9481). Brazil: Rio Grande do Norte—Praia de Cibaúna, 3 males, 4 females, 2 ovigerous females (MZUSP-6963). Pernambuco—Recife, Boa Viagem, 1 male (MZUSP- 868). Alagoas—Passo de Camaragibe, 1 female (LabMar-1148). Bahia—Salvador, Praia do Farol da Barra, 1 male (MZUSP-17620). Espírito Santo—Guarapari, Praia das Castanheiras, 2 males, 1 female, 2 ovigerous females (MZUSP-6993). Rio de Janeiro—Angra dos Reis, Ilha Grande dos Porcos, 3 males, 1 female (MNRJ-8645). São Paulo—Guarujá, Perequê, 1 male (MZUSP-18687). Paraná—Paranaguá, Ilha do Mel, Praia de Fora, 1 male (MZUSP-11076). Santa Catarina—Ilha São Francisco, 3 males, 3 ovigerous females (MZUSP-9977); 16 males, 4 females, 6 ovigerous females (MZUSP-10596).

Recognition characters. Carapace subquadrate, as broad as long in males, slightly broader than long in females; posterolateral regions plicate. Front with tuft of short plumose setae. Chelipeds subequal, fairly rugose, with 3 longitudinal rows of large, flatenned, imbricate tubercles bearing fine, short pubescence; merus striated, a single tubercle on flexor margin; flexor margin of carpus with 3 tubercles; propodus with flatenned granules on cutting face, outer row of tubercles double, extending onto pollex; fingers of major cheliped with hiatus, tuft of dense pubescence on cutting face. Walking legs covered with long plumose setae, mainly on carpus and propodus; propodus with 4 spines on flexor margin, dactylus with 3 spines on flexor margin. No gonopods in males. Telson composed of 5 plates.

Habitat. From intertidal region down to 40 m, in small cave systems formed by several sessile species, including sand reefs of Phragmatopoma lapidosa (Annelidae: Polychaeta); and under rocks (Werding 1977; Micheletti-Flores & Negreiros-Fransozo 1999).

Geographic distribution. Western Atlantic—USA, eastern Florida; Mexico, Tamaulipas, Veracruz, Campeche and Quintana Roo; Virgin Islands, St. Thomas and St. John; Colombia, Santa Marta, Cabo de la Vela and Rosario Islands; Venezuela, Margarita and Cubagua Islands; Trinidad; and Brazil (from Pará to Santa Catarina). Eastern Pacific—Ecuador, La Libertad; and Peru, Cancas.

Figures

FIGURE 2. Preserved specimens, dorsal view. A, Pachycheles monilifer (Dana, 1852), ovigerous female (MZUSP- 10596); B, Pachycheles riisei (Stimpson, 1859), ovigerous female (DOUFPE- 7485); C, Pachycheles rugimanus A. Milne-Edwards, 1880, male (USNM- 188445); D, Petrolisthes amoenus (Guérin-Menéville, 1855), ovigerous female (MZUSP- 16713); E, Petrolisthes armatus (Gibbes, 1850), male (MZUSP- 20173); F, Petrolisthes galathinus (Bosc, 1802), ovigerous female (MZUSP- 11303); G, Petrolisthes marginatus Stimpson, 1858, ovigerous female (MNRJ- 3635); H, Petrolisthes rosariensis Werding, 1978, male (MZUSP- 10713). Scales: A, C – H (5 mm); B (1 mm).