Minyocerus angustus (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 : 179

Minyocerus angustus (Dana, 1852)

( Fig. 1 D)

Porcellana angusta Dana, 1852: 423 (type-locality: Brazil, Rio de Janeiro). Minyocerus angustus —Stimpson, 1858: 229.

Porcellana rosamondae Boone, 1930: 79 , plate 21.

Material examined. Brazil: Ceará—Fortaleza, Praia do Mucuripe, 1 male (MNRJ-1422). Alagoas—Maceió, 3 males, 1 ovigerous female (MZUSP-17473); Pontal do Peba, 1 female (LabMar-2084). Bahia—Itacuruçá, 1 male (MZUSP-9465). Rio de Janeiro—Ilha Grande, R/V “Prof. W. Besnard”, st. 211, 13.5 m, 1 male, 2 ovigerous females (MZUSP-7173). São Paulo—Ubatuba, 1 male (MZUSP-9492). Santa Catarina—Praia da Daniela, 3 males, 1 female (MZUSP-9556).

Recognition characters. Carapace subrectangular, distinctly longer than broad, slightly rugose; strong epibranchial spine. Front with single acute tooth. Inner and outer orbital angles strongly produced into acute teeth. Antennule well developed; basal article with 3 spines on distal margin. Antenna poorly developed. Chelipeds thin and elongated, slightly rugose, with simple setae; merus with well-developed distal spine on flexor margin; carpus with 2 or 3 spines on flexor margin; propodus fringed with setae on extensor margin; fingers with row of small tubercles on cutting face. Gonopods present in males. Telson composed of 7 plates.

Habitat. Associated with echinoderms on sandy bottoms from intertidal region (Gore & Shoup 1968; Veloso & Melo 1993) to 27 m (Gore 1974).

Geographic distribution. Western Atlantic—Belize; Honduras; Nicaragua; Costa Rica; Panama, Limón Bay and Colón; Colombia, Gulf of Morosquillo and Santa Marta; Venezuela, La Tortuga, Margarita and Cubagua Islands; Suriname; and Brazil (from Pará to Santa Catarina).

Variation. As reported by Gore & Shoup (1968), there are some intraspecific variations in the number of spines on merus of chelipeds, number of setae on carapace and flexor margin of chelipeds, and width of carapace.

Figures

FIGURE 1. Preseved specimens, dorsal view. A, Megalobrachium mortenseni Haig, 1962, ovigerous female (MZUSP- 24529); B, Megalobrachium roseum (Rathbun, 1900), female (MZUSP- 19905); C, Megalobrachium soriatum (Say, 1818), male (MZUSP- 19903); D, Minyocerus angustus (Dana, 1852), ovigerous female (MZUSP- 17473); E, Pachycheles ackleianus A. Milne-Edwards, 1880, male (MZUSP- 19548); F, Pachycheles chubutensis Boschi, 1963, male (MZUSP- 7194); G, Pachycheles greeleyi (Rathbun, 1900), male (MZUSP- 21232); H, Pachycheles laevidactylus Ortmann, 1892, male (MZUSP- 18723). Scales: A – E (1 mm); F – H (5 mm).