ABSTRACT. LARVAL DEVELOPMENT OF UCA (M/NUCA) BURGERS/ HOLTHUIS (CRUS-TACEA, DECAPODA, OCYPODIDAE), IN THE LABORATORY. Uea (Minuea) burgersi Hollhuis, 1967 was sludied in lhe laboralory under lhe morphological and syslematical sland poinls. One experimenl was carried OUI involving 100 larvae, derived from one ovigerous female collecled in lhe norlh coasl oI' lhe Slale oI' São Paulo, Brazil. The experimenl were carried oul in a c1imalically conlrolled room aI 25± I°C and sleady sallness of34960. The larvae were mainlened individually and food consisled ofrolifers (Braehiolllls plieatil/is) in lhe firsl slage and Artemia sp. in lhe lasl slages. Uea (Minuea) burgersi have five or six zoeal slages and a megalopa one. Ali larval slages were drawn and described in delail. Tables where lhe morphological characlerislic of each slage oflhe sludied specie was described are also included. They were compared wilh the olher species found in lhe bibliography passible oI' being analyzed. The comparalive sludies oI' lhe larval fOlms of each species of Uea showed lhal lhey presenled a greal similarity oI' characlerislics whose specific idenlificalions were only possible wilh lhe aid oI' several slruclures analyzed logelher. In lhe olher hand, lhe differences among lhe genera ofOcypodinae occurring in Brazil are more conclusive, and can be oblained by lhe analyses oI' a few characlerislics. KEY WORDS. Cruslacea, Decapoda, Ocypodidae, Uea, larval developmenl Recentemente, CRANE (1975) realizou uma revisão completa de todas as espécies do gênero Uca, com considerações sistemáticas, evolutivas e comportamentais. No Brasil, o gênero Uca envolve dez espécies, distribuídas em quatro

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ABSTRACT. Juvenile development of Cyrtograpsus al/gu/atus Dana (Crustacea, Decapoda, Grapsidae), in laboratory. This papel' describes the first nine juvenile stages of CyrtogropslIs angll/atus Dana, 1851 obtained in laboratory conditions trom three ovigerous females collected at "Molhes da Barra", Rio Grande, Brazil (32°S and 52°W). The main morphological features, lhe secondary sexual characlers and lhe gills ontogeny were observed. Twenty one individuaIs reached until lhe ninthjuveni le stage. Sexual dimorphism can be veritied from lhe fourth juvenile stage and the number of gills are complele ai the second juvenile slage. KEY WORDS. Cruslacea, Brachyura, Grapsidae, developmenl, juvenile A família Grapsidae encontra-se representada no litoral do Rio Grande do Sul, por seis espécies das sub-famílias Sesarm inae, Varun inae e Grapsi nae as quais estão distribuídas em quatro gêneros: Chasmagnalhus granulata Dana, 1851; Armases rubripes (Rathbun, 1914) Cyrtograpsus angulalus apresenta distribuição geográfica compreendida entre, Atlântico Sul Ocidental : Brasil (do Rio de Janeiro ao Rio Grande do Sul), Uruguai e Argentina (incluindo a Patagônia). Pacífico Oriental: Peru e Chile. Costumam formar grandes concentrações na zona entre-marés, em profundidades muito pequenas. É encontrado também sobre a vegetação das praias (MELO 1996).Os estudos envolvendo larvas de Crustáceos Decápodos tiveram seu início em meados do século passado. THOMPSON (1903) em seu estudo, lançou as bases para os estudos sobre desenvolvimento. É considerado ponto comum entre os carcinologistas, a importância de se conhecer os estágios correspondentes à fase juvenil, quando os indivíduos começam a desenvolver os caracteres sexuais secundários, além de apresentar características diferentes às dos adu ltos. Todav ia, existe uma escassez de trabalhos sobre desenvolvimento juvenil, dev ido provavelmente a dificu ldade de se manter um cultivo até a fase juvenil e, nesta, até que o dimorfismo sexual ocorra, uma vez que o tempo necessário é muitas vezes longo. Portanto, muitos autores detêm seus estudos somente ao desenvolvimento larva!.

ABSTRACT. Juvenile development of Hepatus pudibundus (Herbst) (Crustacea, Decapoda, Calappidae) in laboratory. The Hepatus pudibundus (Herbst, 1785) juvenile development was studied in laboratory, under the morphological and systematical stand points. The eight early juvenile stages were obtained from larvae hatched from eggs of two ovigerous females, collected at the northern coast of the State of São Paulo, Brazil. The experiments were carried out in a climatically controlled room at 25 ± 1ºC, and steady saltness of 34º/oo . The youngs were maintened individually and food consisted of Artemia sp. nauplii and fragments of fish muscle.The first juvenile stage were particulary drawn and described. For the remaining juvenile stages the most representative frameworks were picked out, which allowed the characterization of the first eight stages. According to juvenile morphology studies, it was noted that secondary sexual characters differentation begins from the third stage.

Thejuveniledevelopment of the freshwater crab Dilocarcinus pagei Sdmpson, 1861 was studied under laboratory conditions, focusing on setae morphology. The ovigerous females were eollected manually associated with water hyacinth at the Municipal Dam of Sao José do Rio Preto (Sao Paulo, Brazil). The specimens were raised in the laboratory under constant aeration, photoperiod (12:12 h) and temperature (27 ± 1°C). Twelve juvenile stages were obtained with descriptions of the main morphological characters that allow their identification are presented. Fourteen types of setae were discovered: dentate, denticulate, serrulate, papposerrate, cuspidate, plumose, plumodenticulate, plumoserrulate, simple, pappose, brush, curved, nail and setules. The greatest diversity of setae was found on the mouth appendages, especially the maxillule. The gill ontogeny and sexual dimorphism becomes apparent from the second juvenile stage onwards. At the third juvenile stage, the carapace begins to exhibit a wider shape, becoming similar to that of the adults.

ABSTRACT. Occupation of gastropod shells by hermit crabs (Decapoda, Anomura) in the littoral of Rio Grande, Rio Grande do Sul, Brazil. The present study aimed to characterize the shell occupation by hermit crabs at the Rio Grande city, state of Rio Grande do Sul. Animals were sampled at 14 radials in Rio Grande, between 12 and 50 meters depth. Each hermit crab and its respective shell were identified, weighted and measured. A total of 408 animals were captured, of families Paguridae and Diogenidae; the most abundant species were Dardanus insignis (de Saussure, 1858) and Loxopagurus loxochelis (Moreira, 1901). The animals occupied shells from 13 gastropod species, mainly of Buccinanops lamarckii (Kiener, 1834) and B. gradatum (Deshayes, 1844). Dardanus insignis utilized shells from 12 of the 13 mollusks species registered; L. loxochelis from nine ones. In a general way, the shell occupation patterns present a correlation between the hermit crab size and the shell size, in the case of the two most abundant species the strongest correlation was between their size/weight and shell aperture width, evidencing that shells occupation is given not only by their local availability, but also by the relationship between hermit crabs variables and gastropod shells. KEYWORDS. Shell preference, Dardanus insignis, Loxopagurus loxochelis, south Brazilian coast.RESUMO. O presente estudo teve como objetivo caracterizar a ocupação de conchas por ermitões no litoral da cidade de Rio Grande, Estado do Rio Grande do Sul. Os animais foram amostrados em 14 radiais em Rio Grande, entre 12 e 50 metros de profundidade. Cada ermitão e sua respectiva concha foram identificados, pesados e medidos. Um total de 408 animais foi capturado, pertencentes às famílias Diogenidae e Paguridae; as duas espécies mais abundantes foram Dardanus insignis (de Saussure, 1858) e Loxopagurus loxochelis (Moreira, 1901). Os ermitões ocuparam conchas de 13 espécies de gastrópodes, principalmente de Buccinanops lamarckii (Kiener, 1834) e B. gradatum (Deshayes, 1844). Dardanus insignis utilizou 12 das 13 espécies de moluscos registradas; Loxopagurus loxochelis utilizou nove. De um modo geral, o padrão de ocupação de conchas apresenta uma correlação entre o tamanho do ermitão e o tamanho da concha; no caso das duas espécies de ermitões mais abundantes, a maior correlação foi entre peso/tamanho do animal e o tamanho da abertura da concha, evidenciando, que a ocupação de conchas se dá não apenas pela disponibilidade local das mesmas, mas também pelas relações entre as variáveis dos ermitões e das conchas de gastrópodes. PALAVRAS-CHAVE.Preferência de conchas, Dardanus insignis, Loxopagurus loxochelis, costa sul do Brasil.

ABSTRACT. LARVAL DEVELOPM ENT OFC YRTOGRAI'SUS ANGULATUsDANA (CRUSTACEA, DECAPODA, GRAPSIDAE) lN THF. LAAORATORY. The larval development 01' Cyr/ograpsus allgu/a/IIS Dana, 185 I was studied in laboratory through eggs hatched from ovigerous females collected in mole 01' Rio Grande, Rio Grande, State of Rio Grande do Sul, Brazil. Three experiments (A, B, C) were carried out involving 250 larvae, derived from three ovigerous females. The experiments A and B, were carried in a climatically box with temperature among 22 and 25°C, and salinity among 32 and 34%0. The experiment C in a room without controlled temperature, ill a COllstallt salinity of30%0. (1966, 1967, 1968), COELHO (1971), COELHO & RAMOS (1972)

The fiddler crab Uca (Minuca) burgersi has been recorded in eastern American coast, from Florida to Brazil (from Maranhão to São Paulo). The juvenile stages of U. burgersi are described here based on material reared under laboratory conditions. Additionally a comparison of juvenile morphology is given for the juvenile of other species already studied with occurrence in the Brazilian coast. Larvae of U. burgersi were obtained from one ovigerous female hatched in the laboratory, which reached until the tenth juvenile stage. Rearing was conducted in a temperature-controlled climatic chamber at 25±1ºC, 34‰ salinity and 12/12 (L/D) photoperiod. The first juvenile crab appeared at 43 days after hatching. Only one individual reached the tenth stage 174 days after hatching. The morphology of first juvenile crab was described as well as morphological changes throughout juvenile development. The sexual definition occurs in the fourth juvenile stage, abdominal dimorphism occurs in the sixth juvenile stage and chelipeds dimorphism occurs in the seventh juvenile stage.