title: On Brazilian Helobata Bergroth, 1888 (Coleoptera: Hydrophilidae): description of two new species, new records, and key to species.
abstract: Two new species of Helobata Bergroth, 1888 (Hydrophilidae: Acidocerinae) from Brazil are described and illustrated. Helobata amazonensis sp. nov. is described based on an adult male specimen from the Amazon River floodplains, Amazonas State. Helobata pantaneira sp. nov. is described based on an adult male specimen collected from swamps in the Pantanal biome, in Mato Grosso State. Helobata corumbaensis Fernández & Bachmann, 1987, H. larvalis (Horn, 1873) and H. quatipuru Fernández & Bachmann, 1987 are recorded for the first time from Mato Grosso; Amazonas, Ceará and Mato Grosso; and Rio de Janeiro States respectively. Diagnosis, illustrations, a checklist and a key to Brazilian species of Helobata are provided.
authors.affiliation: Laboratório de Entomologia, Departamento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, caixa postal 68044, 21941-971, Rio de Janeiro, RJ, Brasil. Programa de Pós-graduação em Ciências Biológicas - Zoologia, Museu Nacional, Universidade Federal do Rio de Janeiro. Quinta da Boa Vista, São Cristóvão, 20940-040 Rio de Janeiro, RJ, Brazil.; Email: brclarkson@gmail.com.
authors.forename: Bruno
authors.initials: B
authors.lastname: Clarkson
authors.affiliation: Laboratório de Entomologia, Departamento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, caixa postal 68044, 21941-971, Rio de Janeiro, RJ, Brasil.; Email: unknown.
authors.forename: André Dias Dos
authors.initials: AD
authors.lastname: Santos
authors.affiliation: Laboratório de Entomologia, Departamento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, caixa postal 68044, 21941-971, Rio de Janeiro, RJ, Brasil.; Email: nferrejr@gmail.com.
authors.forename: Nelson
authors.initials: N
authors.lastname: Ferreira
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D049628:Body Size; D001938:Brazil; D057189:Checklist; D001517:Coleoptera / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development; D005260:Female; D008297:Male; D009929:Organ Size