The crustacean species composition in the intertidal zones of 13 sheltered unconsolidated marine beaches in south-eastern Brazil is described. Fifty-three crustacean species were collected, adding 46 species to the total reported by previous studies in the same region. Decapods dominated the community, in contrast to exposed sandy beaches where peracarids normally predominate. The species were distributed irregularly among the beaches. Richness varied markedly among sites, and was positively related to a combination of factors such as ¢ne sand grains, high organic matter content, and relatively low siltĉ lay content. The presence of rock fragments enabled both rocky shore and sandy beach crustaceans to occur on the same beaches. Richness and abundance of crustaceans showed no clear relationship to sediment grain size and slope, in contrast to the norm for exposed sandy beaches. The dominance of the tanaid Kalliapseudes schubarti in some areas may be a result of organic matter pollution in the region. These beaches showed higher species richness than typical sheltered and exposed sandy beaches, indicating that this sheltered, highly heterogeneous seascape is an important area for conservation.
We present here the genera and species of the family Diogenidae recorded from Brazil, with the exception of the genus Paguristes. We provide a diagnosis, synonymy and illustrations for each species of the nine genera from Brazil and identification keys for genera represented by more than one species.
A new species of the hermit crab genus Pagurus (Crustacea: Anomura: Paguridae) is described from Brazil. This is the first new species described in 30 years, with morphological characteristics of the exilis group.
In Brazil, the hermit crab family Paguridae is represented by 11 genera, of which the genus Pagurus is the most speciose, with seven species that occur from the intertidal zone to shallow waters and one from deeper regions. In this paper we present the diagnosis, distribution and some remarks on each species of the genus Pagurus known from Brazil.
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