Abstract A checklist of caridean and stenopodidean shrimps of the Caribbean coast of Panama is presented, based on material collected during two local workshops (2005, 2008) as well as extensive sampling during 2006-2010. This material is augmented by an annotated list of previously recorded species, amounting to a total of 157 species, including 20 new records. Doubtful records are discussed. The current checklist is however considered relatively incomplete as older records could not always be verified and more taxa remain to be described. Despite the deficiencies of the present list, the Caribbean coastline of Panama is clearly one of the most species rich areas in the entire Atlantic Ocean for caridean shrimps.

Abstract A new species of the freshwater crab genus Sundathelphusa Bott, 1969 is described from the Indonesian island of Lombok. Sundathelphusa tuerkayi, new species, appears to be most closely related to Sundathelphusa aruana (Roux, 1911), which is known for certain only from the Aru Islands, but differs from it and all other congeners by a unique combination of morphological characters. The new crab hosts a small ectosymbiotic temnocephalid flatworm, possibly belonging to the genus Temnosewellia Damborenea and Cannon, 2001 (Platyhelminthes: Temnocephalida).

O presente estudo trata de quatro espécies de camarões pontoniíneos do gênero Typton Costa, 1844, associados a esponjas, provenientes do Brasil: T. distinctus Chace, 1972, T. fapespae Almeida, Anker & Mantelatto, 2014, T. prionurus Holthuis, 1951, e T. vulcanus Holthuis, 1951. Typton distinctus é registrada pela primeira vez para o Rio de Janeiro, o que amplia significativamente a sua distribuição meridional (no Brasil esta espécie era conhecida apenas de Pernambuco). Typton fapespae, recentemente descrita de São Paulo, é adicionalmente registrada para o Rio de Janeiro. Typton prionurus e T. vulcanus são registradas para a Bahia. Typton prionurus era conhecida anteriormente no Brasil com base em um registro duvidoso para a costa do Pará, enquanto que T. vulcanus é registrada pela primeira vez para o Atlântico Sul Ocidental (Brasil). Typton prionurus e T. vulcanus são ilustradas.

The present study deals with Brazilian material of four sponge-dwelling species of the pontoniine shrimp genus Typton Costa, 1844: T. distinctus Chace, 1972, T. fapespae Almeida, Anker & Mantelatto, 2014, T. prionurus Holthuis, 1951, and T. vulcanus Holthuis, 1951. Typton distinctus and T. fapespae are recorded for the first time from Rio de Janeiro, representing a significant southward range extension for the former species (previously known only from Pernambuco) and a slight northward extension for the latter species (previously known only from São Paulo). Typton prionurus and T. vulcanus are recorded for the first time from Bahia. The former species was previously known from Brazil based on a single questionable record from the coast of Pará, whereas the latter species is recorded from Brazil and the southwestern Atlantic for the first time. Illustrations are provided for T. prionurus and T. vulcanus.

O presente estudo descreve duas novas espécies de crustáceos decápodos da infauna baseado em material coletado na Bahía Málaga, costa pacífica da Colombia, em 2009. A primeira delas, o corrupto Axianassa darrylfelderi sp. nov. (Axianassidae), aparenta estar mais relacionada morfologicamente a A. australis Rodrigues & Shimizu, 1992, A. canalis Kensley & Heard, 1990, e A. jamaicensis Kensley & Heard, 1990. Contudo, a nova espécie difere em uma combinação de caracteres morfológicos, principalmente no exópodo uropodial, acículo (escama) antenal, terceiro maxilípede e primeiro pleonito. A segunda espécie nova, o camarão Leptalpheus canterakintzi sp. nov. (Alpheidae), associado às galerias de A. darrylfelderi sp. nov., incontestavelmente representa a espécie-irmã no Pacífico Oriental da espécie L. axianassae Dworschak & Coelho, 1999 do Atlântico Ocidental, a qual vive exclusivamente em galerias de A. australis. As duas espécies são distinguíveis apenas pelas proporções do mero e propodo do terceiro par de pereiópodos. Além disso, Leptalpheus azuero Anker, 2011, previamente conhecido somente para o Panamá, é registrado pela primeira vez para a Colômbia.

Two new species of infaunal decapod crustaceans are described based on material collected in Bahía Málaga, Pacific coast of Colombia, in 2009. The mud-shrimp Axianassa darrylfelderi sp. nov. (Axianassidae) appears to be most closely related to A. australis Rodrigues & Shimizu, 1992, A. canalis Kensley & Heard, 1990, and A. jamaicensis Kensley & Heard, 1990. The new species may be distinguished from each of them by a combination of morphological features, mainly on the uropodal exopod, antennal acicle, third maxilliped and first pleonite. The shrimp Leptalpheus canterakintzi sp. nov. (Alpheidae), associated with burrows of A. darrylfelderi sp. nov., undoubtedly represents the eastern Pacific sister species of the western Atlantic L. axianassae Dworschak & Coelho, 1999, which lives exclusively in burrows of A. australis. The two species are reliably distinguishable only by the proportions of the merus and propodus of the third pereiopod. Leptalpheus azuero Anker, 2011, previously known only from the Pacific coast of Panama, is reported for the first time from Bahía Málaga, Colombia.

Duas espécies de camarões Alpheidae do gênero Salmoneus Holthuis, 1955, são registradas para águas litorais de São Sebastião (SP), sudeste brasileiro. Salmoneus depressus Anker, 2011, previamente conhecida da região do Caribe, é registrada pela primera vez para o Brasil e para o Atlântico sul ocidental. Salmoneus ortmanni (Rankin, 1898), conhecida anteriormente de um único registro confirmado para o Atol das Rocas (03°S), é mencionada aqui para o litoral sudeste do Brasil (23°S). Os registros prévios de S. ortmanni para o Brasil referem-se, na realidade, à Salmoneus carvachoi Anker, 2007. Variações morfológicas em S. depressus são discutidas e ilustradas. Fotografias em cor de S. depressus e S. ortmanni obtidas a partir de exemplares vivos são fornecidas, assim como uma chave para as espécies de Salmoneus conhecidas para o Atlântico sul.

Two species of the alpheid shrimp genus Salmoneus Holthuis, 1955, are reported from shallow waters of São Sebastião (SP), southeastern Brazil. Salmoneus depressus Anker, 2011 is recorded for the first time in Brazil and the southwestern Atlantic; this species was previously known only from the Caribbean region. Salmoneus ortmanni (Rankin, 1898) is recorded for the first time in southern Brazil (23°S), being previously known in Brazilian waters from a single confirmed record from Atol das Rocas (03°S), with older records referring to Salmoneus carvachoi Anker, 2007. A hitherto unknown morphological variation in S. depressus is discussed and illustrated. Both species are shown in colour to facilitate their identification in the field. A key to the southern Atlantic species of Salmoneus is also provided.

The barbouriid shrimp Janicea antiguesis (Chace, 1972) is reported from Porto de Galinhas and Tamandaré in Pernambuco and Guarapari in Espírito Santo, Brazil. These records confirm the presence of J. antiguensis in northeastern and eastern Brazil, considerably extending its Brazilian range from Fernando de Noronha to southern Espírito Santo and also representing the first record of this species from mainland coastal reefs. In Brazil, J. antiguensis occurs in or near marine reef caves, typically at depths between 5 and 15 m, and can be most easily observed while scuba diving at night. Colour photographs of J. antiguensis from various Atlantic localities are provided and its colour pattern is compared to that of the closely related Indo-West Pacific barbouriid shrimp, Parhippolyte misticia (Clark, 1989). Some in situ observations are provided for the Porto de Galinhas population of J. antiguensis. Multiple observations of pairs with both individuals brooding embryos at different developmental stages suggest protandric simultaneous hermaphroditism in J. antiguensis.

The alpheid shrimp Athanas dimorphus Ortmann, 1894, common and widespread throughout the Indo-West Pacific, is reported for the first time from Brazil, representing the first invasive alpheid species in Brazil, and the first species of the genus Athanas Leach, 1816 introduced to the western Atlantic. The present record is based on several specimens collected at two localities in Ceará, Pedra Rachada beach near the town of Paracuru, and Meireles beach in Fortaleza. Athanas dimorphus is very common at the second site, suggesting that a population of this species is now established in northwestern Brazil. An updated list of marine and freshwater decapods accidentally or voluntarily introduced to Brazil is provided.