Farfantepenaeus isabelae is a recently described pink shrimp species with occurrence restricted to the South Atlantic. The real geographic distribution of this still uncertain, probably due difficulties on identification in relation congeners. present study aims increase knowledge about its by using an integrative approach morphology, molecular and niche modeling analysis. Our results extend both western eastern limits F. isabelae, elucidating gaps along northern region Brazil. will...

Sexual dimorphism is often observed in Crustaceans. Considering the great diversity of this subphylum, only few reports are found literature and most mainly based on traditional morphometry. The present study uses geometric morphometrics analysis to identify sexual by shape variation overexploited semiterrestrial crab Ucides cordatus , species with social economic importance South America. Comparative morphology analyses were performed using outer face propodus major cheliped, dorsal...

The evaluation of population characteristics, particularly those endemic species, aids in preservation and management. Hermit crabs present an innate behavior occupying shells, which tends to individual needs limits their distribution. This study characterized the pattern occupation gastropod shells by hermit Loxopagurus loxochelis three bays southwestern coast Brazil. Monthly collections were made from January/1998 December/1999 Ubatumirim (UBM), Ubatuba (UBA) Mar Virado (MV) with a...

The sea slug Bursatella leachii is formally recorded for the first time in state of Rio Grande do Norte, at latitudes below geomorphological formation Touros High, a significant continental landmark South America and Northeast Brazil Ecorregion. New records on northern eastern coast Norte are reported, including oldest historical record species state, now encompassing period 30 years regional occurrences.

The present study aims to show the intra- and inter-basin body-shape variations of freshwater prawn Macrobrachium jelskii (Miers, 1877) in Brazilian Neotropical semiarid basins, quantifying relations address if its occurrence is old natural or recent artificial (anthropic). We used a geometric-morphometric tool explore patterns shape variation cephalothorax, abdomen cheliped regarding eco-evolutionary traces (sexual dimorphism, hydrodynamism geographical isolation) among drainages. sexual...

We evaluated the population characteristics of Dardanus insignis, focusing on reproductive period, juvenile recruitment, sexual maturity, growth and longevity species. Samples were collected monthly over two years (1998 1999), by trawling, in a subtropical region Brazil. The hermit crabs counted demographic group, weighed measured for cephalothoracic shield length, their gonadal stage was identified using stereo microscope. A total 3169 captured (1838 males 1331 females). Ovigerous females...

Patterns of spatio-temporal distribution Brachyura are determined by the interaction among life history traits, inter and intraspecific relationships, as well variation abiotic factors. This study aimed to characterize patterns Persephona lichtensteinii , mediterranea punctata in two regions northern coast São Paulo State, southeastern region Brazil. Collections were done monthly from July 2001 June 2003 Caraguatatuba Ubatuba, using a shrimp fishery boat equipped with double-rig nets. The...

The species Callinectes sapidus is reported for the first time in state of Rio Grande do Norte, Northeastern Brazil. In Brazil, this only known from Sul to Paraíba. work, one more gap about distribution was discovered. Samplings were gathered two localities: Cavalos River and Ceará-mirim River, north east coast respectively. This new record increases information singular species, being with disjoint Americas.

Abstract There are gaps in what is known about the patterns of gastropod shell use by hermit crabs Brazilian lagoon areas, especially Northeastern Brazil. However, this important because understanding selection provides information on life history and eco‐evolutionary conceptions paguroids. The present study investigated shells occupied Pagurus criniticornis Clibanarius sclopetarius a coastal seasonally connected to an estuary sea, correlating aspects hydrodynamic characters. was carried out...

In this study we tested the effect of population density on agonistic interactions in male Uca leptodactyla Rathbun, 1898. We recorded crab’s behaviour pairs or groups five animals composed conspecifics and heterospecifics living same area (sympatric) distinct areas (allopatric) mangrove forest. Allopatric conspecific crabs showed higher approaching signalling than those other conditions. The crab density, lower interaction intensity between animals. Low-level signals were mainly displayed...

The present study evaluates the ontogenetic/sexual morphometric variation in Xiphopenaeus kroyeri. Sampling was from July 2001 to June 2003 at Ubatuba, São Paulo, Brazil. Animals were sexed and measured (cephalothorax length-CC, partial of rostral spine-CPR, spine-CR spine angulation-AR). Data analysis included linear analysis: equation ln y = a + b (sex/ontogeny fitting), k-means method (ontogenetic classification), covariance (morphological maturity), removal allometric effect,...

The shape of the secondary sexual characters is, traditionally, used to discriminate marine shrimps at species level. However, qualitative evaluation structures that are morphologically variable in taxonomy can favor misunderstandings and misidentifications. These possibilities taxonomic inaccuracies especially alarming when there is a need evaluate invasion introduced species. present study geometric morphometric analyses identify differences cephalothorax would help native non-native...

Pilumnus dasypodus is reported for the first time in state of Rio Grande do Norte, Northeastern Brazil. Sampling occurred north and south coast four locations (the farthest about 500 km known distribution species). This new record increases information this species, showing a possible relationship between species Atlantic Tropical Ecoregion.

In April 2012, a specimen of giant tiger prawn, Penaeus monodon , was captured by an artisanal bottom trawlboat on the northern continental shelf Rio Grande do Norte State, northeastern Brazil. This specimen, female, collected from 4-meter depth, had partial total length 249.6 mm and weighted 173 g. is second report P. off coast Norte, 11 years after first record, which suggests ongoing southward expansion this species in

After more than 30 years of species' first capture on the Brazilian northeast coast, we report second occurrence starfish Luidia senegalensis with niche modeling remarks its distribution. Bottom trawl net collected specimens artisanal fishery boat in Rio Grande do Norte State, Brazil. It was noted existence a large number regions, high suitability for this species, South America taking into account ecological modeling, when compared to North and Central American continents. Benthic salinity...