title: First record of Dero (Aulophorus) bimagnasetus Harman (Oligochaeta) from Brazil and habitat characteristics.
abstract: Annelid worms represent a significant part of freshwater benthic communities worldwide and Oligochaeta is a particularly species-rich group. Dero (A) bimagnasetus (Naididae) previously found and described from a small marsh in Surinam in 1974, has now been found for the first time in Barra Lake, MG, Brazil. Due to the scarce biological data and absence of ecological information in the literature regarding this species we are presenting morphological information on the specimens obtained and the physical and chemical characteristics of the habitat they were found. This species occurred only in the littoral zone of Barra Lake, in muddy, low oxygen, low conductivity and low organic matter sediment. The four individuals collected ranged 3.17-4.15 mm total length; 0.25 - 0.26 mm body width and 0.16-0.21 mm3 total volume. Considering the present anthropic pressures on freshwater biota and fast biodiversity losses worldwide it is now recognized that attention must be paid to low abundance species and the urgency for preservation of their habitats.
authors.affiliation: Programa de Pós-Graduação em Ciências, Departamento de Hidraúlica e Saneamento, Escola de Engenharia de São Carlos, Universidade de São Paulo ? USP, São Carlos, SP, Brazil.
authors.forename: R
authors.initials: R
authors.lastname: Campitelli-Ramos
authors.affiliation: Departamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Carlos ? UFSCar, São Carlos, SP, Brazil.
authors.forename: J V
authors.initials: JV
authors.lastname: Lucca
authors.affiliation: Programa de Pós-Graduação em Ciências, Departamento de Hidraúlica e Saneamento, Escola de Engenharia de São Carlos, Universidade de São Paulo ? USP, São Carlos, SP, Brazil.
authors.forename: L L D
authors.initials: LL
authors.lastname: Oliveira
authors.affiliation: Instituto Nacional de Limnología ? INALI, Consejo Nacional de Investigaciones Científicas y Técnicas ? CONICET, Universidad Nacional del Litoral ? UNL, Santa Fé, Argentina.
authors.forename: M R
authors.initials: MR
authors.lastname: Marchese
authors.affiliation: Departamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Carlos ? UFSCar, São Carlos, SP, Brazil.
authors.forename: O
authors.initials: O
authors.lastname: Rocha
mesh_terms: D000818:Animals; D044822:Biodiversity; D001938:Brazil; D017753:Ecosystem; D004784:Environmental Monitoring; D060106:Lakes; D009835:Oligochaeta / Q000033:anatomy & histology* / Q000145:classification*; D012621:Seasons