RESUMO Os diferentes microhabitats proporcionados pelas pradarias marinhas e o habito das espécies determinam a distribuição vertical de espécies de crustáceos. Este estudo verificou a influência da sazonalidade sobre a distribuição espacial da comunidade de crustáceos associada a uma pradaria de Halodule wrightii. De abril de 2006 a julho de 2007, foram realizadas 15 amostragens na praia das Goiabeiras, estado do Ceará, em cada uma com cinco amostras seccionadas em partes aérea e subterrânea. Cumáceos e o anfípode Hyale media (Dana, 1853) tiveram a maior frequência, densidade e dominância em relação a outros táxons, em ambos os estratos. A comunidade exibiu mudanças graduais ao longo do estudo, em ambos os estratos aéreo e subterrâneo, mas a estrutura da pradaria não foi suficiente para explicar a distribuição vertical da fauna de crustáceos ao longo do tempo.

ABSTRACT The different microhabitats provided by seagrasses and the habit of the species determinate the vertical distribution of crustaceans. This study verified the influence of the seasonality on the spatial distribution of the crustacean community associated with a Halodule wrightii meadow. From April 2006 to July 2007, we performed fifteen samplings in Goiabeiras Beach, Ceará State, each with five sectioned replicates in belowground and aboveground. Cumaceans and the amphipod Hyale media (Dana, 1853) had a higher frequency, density, and dominance than the other taxa, in both strata. The community exhibited gradual changes along the study, in both the belowground and aboveground strata, but the seagrass structure was not sufficient to explain the vertical distribution of the crustacean fauna along the time.

ABSTRACTTwo new species of family Tanaopsidae, genus Tanaopsis, from Admiralty Bay (Antarctica) are herein described. Tanaopsis brevicorpus sp. nov. displays antennule article 1 about 1.5 times as long as wide, carapace as long as first three pereonites, both rami of uropod biarticulate with fusion line, and pleotelson short, more than twice longer than wide. Tanaopsis bamberi sp. nov. resembles other Antarctic species T. kerguelenensis in its habitus, antennule long and uropod uniarticulate. However, the new species can be distinguished from it by a combination of characters that includes maxilliped basis with long seta arising from tubercles; inner margin of cheliped fixed finger with three smooth sub-terminal spines; uropod subequal to pleotelson in length, and uropodal endopod about twice as long as exopod.

A new species of Paratanais Dana, 1852, Paratanais coelhoi sp. nov., is described and new records for Paradoxapseudes intermedius (Hansen, 1895), Intermedichelia gracilis Guţu, 1996, Vestigiramus sp., Nototanoides cf. trifurcatus Sieg and Heard, 1985, Biarticulata sp. and Arhaphuroides sp. are provided from northeastern Brazil based on collections from the REVIZEE-NE Program. This raises the number of tanaidacean species from the Brazilian coast from 45 to 49. Paratanais coelhoi sp. nov. shares morphological features such as habitus shape, maxilliped palp setation, and cheliped proportions with P. oculatus (Vanhöffen, 1914), P. martinsi Bamber and Costa, 2009, P. tara Bird, 2011 and P. euelpis Barnard, 1920. The new species can, however, be distinguished by a unique combination of characters including: pleonites 1-4 with lateral circumplumose setae while the 5th with simple seta only; antennule article 1 stout; cheliped propodus with one specialized outer 'S'-shaped broad seta; pereopod 1 merus length with 1.7 times as long as wide; pereopod 2 merus without ventral spiniform seta; uropodal endopod biarticulate, exopod uniarticulate as well as other characters.