Petrolisthes marginatus Stimpson 1859
Creators: name: Ferreira, Luciane Augusto De Azevedo
name: Melo, Gustavo Augusto Schmidt De
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Porcellanidae
Petrolisthes
Petrolisthes marginatus

description: Petrolisthes marginatus Stimpson, 1859
(Fig. 2 G)
Petrolisthes marginatus Stimpson, 1858: 227 [nomen nudum]; 1859: 74 (type-locality: Barbados). Porcellana cessacii A. Milne-Edwards, 1878: 229.
Petrolisthes cessacii— A. Milne-Edwards & Bouvier, 1900: 346.
Petrolisthes armatus —Haig, 1962: 178 [non P. armatus (Gibbes)].
Non Petrolisthes marginatus— Haig, 1960: 47, pl. 20, fig. 1, tab. 10.—Gore, 1982: 17 [= P. haigae Chace, 1962].
Material examined. Brazil: Trindade Island, 3 males, 2 ovigerous females (MNRJ-3635).
Recognition characters. Carapace subtriangular, as long as broad, covered with short setae, lateral margins plicate; strong epibranchial spine. Outer orbital angle produced into small acute spine. Merus of antenna with subtriangular, serrate lobe bearing a distal acute spine on mesial margin. Chelipeds equal, covered with short setae; merus rugose, with subtriangular serrate-edged lobe on flexor margin; carpus with 3 to 5, usually 4, serrate-edged teeth on flexor margin, extensor margin with row of small oblique tubercles, 1 or 2 posterodistal spines; propodus broad, flattened. Walking legs rugose; merus fringed with plumose setae and spines on extensor margin, propodus with 4 well-developed spines on flexor margin, dactylus with 3 spines on flexor margin. Gonopods present in males. Telson composed of 7 plates.
Habitat. In crevices on reefs and other rough permanent substrates. In shallow waters, under rocks, from littoral to 3 m depth (Veloso & Melo 1993).
Geographic distribution. Western Atlantic—USA, Florida; Gulf of Mexico; Nicaragua; Panama, Gulf of San Blás; Puerto Rico; Virgin Island, St. Thomas; Barbados; Colombia, Providence, Rosario and Santa Marta Islands; Curacao and Bonaire; Venezuela, Blanquilla, Los Roques, Aves, Margarita and Cubagua Islands; Trinidad and Tobago; and Brazil (Fernando de Noronha and Trindade Islands and Maranhão). Eastern Atlantic—Africa, Cabo Verde, Annobon and Ascension Islands and from Senegal to Ghana.
Variation. Number of spines on carpus of chelipeds varies from 2 to 4.
Remarks. Stimpson (1859) briefly described this species based on the single holotype from Barbados but no illustration of the species was given. The holotype was probably destroyed by the Great Chicago Fire (Evans 1967; Gore 1983).
The identity of P. marginatus was reviewed by Gore (1983), who considered P. cessacii A. Milne-Edwards, 1878 from the Gulf of Mexico and Caribbean Sea, as a junior synonym of the former species.
Material from the eastern Pacific identified to P. marginatus, belongs to P. haigae Chace, 1962, which is the sister-species of P. marginatus from the eastern Pacific. Chace (1962) noted that the two species may be differentiated by the number of the epibranchial spines: two in P. haigae instead of one in P. marginatus.
description: Published as part of Ferreira, Luciane Augusto De Azevedo & Melo, Gustavo Augusto Schmidt De, 2016, Porcelain crabs from Brazil (Crustacea: Decapoda: Anomura: Porcellanidae), pp. 175-194 in Zootaxa 4092 (2) on pages 187-188, DOI: 10.11646/zootaxa.4092.2.2, http://zenodo.org/record/261197