title: Three new species of Macrelmis Motschulsky (Coleoptera: Elmidae: Elminae) from Southeastern Brazil with new definition of species groups to the genus.
abstract: Three new species of Macrelmis Motschulsky, 1859 are described and illustrated based on adult males from Rio de Janeiro, Minas Gerais and São Paulo states (southeastern Brazil). A new species groups definition is proposed for the genus, with a redefinition of the former six (aristeae sp. group, celsa sp. group, isus sp. group, granigera sp. group, milleri sp. group and striata sp. group) and designation of four new groups (alea new sp. group, amazonica new sp. group, grandis new sp. group and jureceki new sp. group). The male genitalia of M. clypeata is illustrated for the first time and distributional maps for all species of the genus are provided.
authors.affiliation: Laboratório de Insetos Aquáticos, Departamento de Biociências, Universidade Federal do Estado do Rio de Janeiro, cep: 2290240, Rio de Janeiro, RJ.; Email: minespassos@gmail.com.
authors.forename: Maria Inês Silva
authors.initials: MI
authors.lastname: Dos Passos
authors.affiliation: Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark (Zoological Museum), University of Copenhagen, Universitetsparken 15, 2100, Copenhagen, Denmark; Email: unknown.
authors.forename: Gustavo Silva
authors.initials: GS
authors.lastname: De Miranda
authors.affiliation: Laboratório de Entomologia, Departamento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Caixa postal. 68044, 21944-970, Rio de Janeiro, RJ; Email: unknown.
authors.forename: Jorge Luiz
authors.initials: JL
authors.lastname: Nessimian
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D049628:Body Size; D001938:Brazil; D001517:Coleoptera / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development; D005260:Female; D008297:Male; D009929:Organ Size