Registro da família Eiconaxiidae Sakai & Ohta, 2005 (Crustacea: Decapoda: Thalassinidea) no Brasil, com redescrição de Eiconaxius carinatus (Bouvier 1925) / First record of family Eiconaxiidae Sakai & Ohta, 2005 (Crustacea: Decapoda: Thalassinidea) in Brazil, with redescription of Eiconaxius carinatus (Bouvier 1925)

Eiconaxius carinatus (Bouvier 1925) caracteriza-se, principalmente, por apresentar carenas laterais do rostro lisas, mero da quela maior com carena dorsal lisa, palma da quela maior exibindo carena dorsal bem nítida e dedos da quela menor de comprimento inferior ao da palma. Um exemplar foi coletado ao largo do Estado do Maranhão (00º 08' N e 44º 32' W) a 247 m de profundidade. A área de ocorrência anteriormente conhecida abrangia a Flórida e Antilhas (Santa Cruz e São Vicente), entre 161 e 339 m. Este trabalho registra pela primeira vez a família para o Brasil.

Eiconaxius carinatus (Bouvier 1925) is characterized, mostly, by smooth rostral lateral carinae, merus of major chela with smooth dorsal carina, palm of major chela with dorsal carina evident and length of fingers of minor chela less than the palm length. One specimen was collected off the state of Maranhão (00º 08' N and 44º32'W) in a depth of 247 m; this species was known previously from Florida and West Indies (Saint Croix and Saint Vincent), in depths between 161 and 339 m. This record is the first record of this family for Brazil.

Decapod crustaceans in fresh waters of southeastern Bahia, Brazil.

A total of 117 species of freshwater decapod crustaceans are known from Brazil. Knowledge regarding the fauna of Decapoda from inland waters in the state of Bahia, northeast Brazil, is incipient. In spite of its wide territory and rich hydrographic net, only 13 species of limnetic decapods have been reported from that state. The objective of this contribution was to survey decapod crustaceans of some hydrographic basins in southeastern Bahia. The material described herein was obtained in samplings conducted between 1997 and 2005. Voucher specimens were deposited in the carcinological collections of the Museu de Zoologia, Universidade Estadual de Santa Cruz, Ilhéus, Brazil, and Departamento de Oceanografia, Universidade Federal de Pernambuco, Recife, Brazil. A total of 13 species was collected. The carideans were represented by the atyids Atya scabra (Leach, 1815) and Potimirim potimirim (Müller, 1881) and the palaemonids Macrobrachium acanthurus (Wiegmann, 1836), M. amazonicum (Heller, 1862), M. carcinus (Linnaeus, 1758), M. heterochirus (Wiegmann, 1836), M. jelskii (Miers, 1877), M. olfersi (Wiegmann, 1836), and Palaemon (Palaemon) pandaliformis (Stimpson, 1871). The brachyurans were represented by the portunids Callinectes bocourti A. Milne-Edwards, 1879 and C. sapidus Rathbun, 1895, the trichodactylid Trichodactylus fluviatilis Latreille, 1828 and the panopeid Panopeus rugosus A. Milne-Edwards, 1881. Macrobrachium heterochirus represents a new record from Bahia, and M. amazonicum is reported for the first time in southeast Bahia. The occurrence of two extreme different forms of T. fluviatilis was observed. Form A is characterized by the frontal margin of carapace bordered by conspicuous granules, the anterolateral margin provided with developed teeth plus granules, and the posterolateral margin provided with granulation similar to that found on the front. In form B the frontal margin is smooth or has an inconspicuous granulation; the anterolateral margin is usually provided with 1-3 notches, and teeth (1-2), if present, are small; and the posterolateral margin is smooth or slightly granulated.

Crustáceos decápodos estuarinos de Ilhéus, Bahia, Brasil / Estuarine decapod crustaceans from Ilhéus, State of Bahia, Brazil

A carcinofauna dos ambientes marinhos e costeiros das regiões sudeste e sul da Bahia, Brasil, ainda é pobremente conhecida. O objetivo deste estudo foi realizar um inventário da fauna de crustáceos decápodos do município de Ilhéus, localizado no sudeste da Bahia (14º47'55"S, 39º02'01"W). As amostragens foram realizadas de Fevereiro de 2001 a Fevereiro de 2005, nas zonas supra, meso e infralitoral. Os exemplares coletados foram fixados em etanol 70 por cento e depositados na coleção de crustáceos da Universidade Estadual de Santa Cruz, Ilhéus (MZUESC). Foi coletado um total de 51 espécies pertencentes a 14 famílias. A família mais representativa em termos de número de espécies foi Ocypodidae, representada nas amostragens por 8 espécies. A distribuição geográfica conhecida para as espécies Alpheus heterochaelis (Caridea: Alpheidae), Merguia rhizophorae (Caridea: Hippolytidae) e Sesarma curacaoense (Brachyura: Sesarmidae) foi estendida. A ocorrência do siri exótico Charybdis hellerii, originário do Indo-Pacífico, foi registrada para o estuário do rio Cachoeira. Estes resultados indicam que os estuários de Ilhéus abrigam elevada riqueza de espécies.

The carcinofauna from marine and coastal environments from the southeast and southern Bahia, Brazil, is so far poorly known. The objective of this study was to survey decapod crustaceans occurring along the estuarine environments of Ilhéus, located on the southeast coast of Bahia (14º47'55"S, 39º02'01"W). Samplings were carried out from February 2001 to February 2005, covering supratidal, intertidal and subtidal habitats. Voucher specimens were fixed in ethanol 70 percent and deposited in the collection of Crustacea of the Universidade Estadual de Santa Cruz, Ilhéus (MZUESC). We report a total of 51 species, belonging to 14 families. The most representative family concerning the number of species was Ocypodidae, represented in our samples by 8 species. Geographic range known for the species Alpheus heterochaelis (Caridea: Alpheidae), Merguia rhizophorae (Caridea: Hippolytidae) and Sesarma curacaoense (Brachyura: Sesarmidae) was enlarged. The Indo-Pacific portunid crab Charybdis hellerii was recorded for the Cachoeira river estuary. The results indicate a high species richness of decapod crustaceans in the estuarine environments of Ilhéus.