Porcelain crabs from Brazil (Crustacea: Decapoda: Anomura: Porcellanidae) Author Ferreira, Luciane Augusto De Azevedo Author Melo, Gustavo Augusto Schmidt De text Zootaxa 2016 4092 2 175 194 journal article 10.11646/zootaxa.4092.2.2 210d7273-bbb8-410c-aeb7-222cbd828cfc 1175-5326 261197 00C31F86-103C-4425-B40D-78E7D52AB668 Megalobrachium mortenseni Haig, 1962 ( Fig. 1 A) Megalobrachium mortenseni Haig, 1962: 189 , figures 2–5 (type-locality: Virgin Islands , northwest of St. John , west of Congo Cay). Material examined . Brazil : Bahia—Abrolhos, 1 female (MZUSP-10652); Recife de Popa Verde, 3 males , 1 female (MNRJ-6782). Espírito Santo – Piúma, 20°50’578”S, 40°28’553”W, 21.5 m, 3 males , 1 ovigerous female (MZUSP-24529). Rio de Janeiro—Ilha Grande, Praia do Furão, 1 male (MNRJ-3646); Cabo Frio, Búzios, Praia da Armação, 1 male (MNRJ-3816). São Paulo—São Sebastião, Praia do Porto, 1 ovigerous female (MZUSP-9531). Recognition characters . Carapace rounded, as long as broad in males, slightly broader than long in females; quite eroded; lateral margins with crenulate crest; protogastric ridge and cervical groove evident; gastric region elevated, posterolateral region plicated. Pterygostomial flap of carapace with median longitudinal serrate crest. Front with serrate margin. Chelipeds equal, eroded and covered with small rounded tubercles; merus rugose, with small, serrate distal lobe on flexor margin; carpus with 4 longitudinal crenulate carinae, small lobe in proximal third on flexor margin; propodus with 3 longitudinal crenulate carinae; dactylus with 1 longitudinal crenulate carina. Walking legs slender, carpus with 2 serrate crests on extensor margin; propodus with 5 spines on flexor margin, dactylus with 4 spines on flexor margin. Gonopods present in males. Telson composed of 7 plates. Habitat. Intertidal region down to depths of 30 meters, usually on rocky substrates. Geographic distribution . Western Atlantic—Honduras, Roatán, Bay Islands; Panama , Bocas del Toro and Limón Bay; Virgin Islands , St. John ; Colombia , Santa Marta and Rosario Islands; Venezuela , Margarita Island ; and Brazil (Pará to São Paulo).