title: A new species ofPolyplociaLestage from Malaysia with comments on the genus (Ephemeroptera, Euthyplociidae, Euthyplociinae).
abstract: Polyplocia nebulosa sp. nov. is described based on male and female imagos from Malaysia, Sabah State. Nymphs provisionally assigned to this species are also described. This species can be readily separated from P. vitalisi by the color pattern of the wings, with light brown longitudinal veins, narrow dark brown clouds on cross veins and margins of wings tinged with brown. The male genitalia are distinct from those of other species of Polyplocia: penes are broad, T-shaped, with large lateral projecting lobes, which are apically rounded, and with a small dorsolateral spine on each lobe; the styliger plate is short and not projected posteriorly. Eggs of the genus are described for the first time using scanning electron microscopy. Eggs are 265-267 µm in length, 170-186 µm in width, barrel-shaped, without polar caps or other attachment structures, with one visible micropyle and with chorion forming an irregular mesh with raised ridges (mesh between 3.8-8 µm). A key to male adults of Polyplocia is provided and additional records of Polyplocia from Thailand are given.
authors.affiliation: Universidade Federal do Rio de Janeiro (UFRJ), Instituto de Biologia, Departamento de Zoologia, Laboratório de Entomologia, Caixa Postal 68044, Cidade Universitária, 21941-971, Rio de Janeiro, RJ, Brazil Programa de pós-graduação em Ciências Biológicas, modalidade Zoologia, UFRJ/Museu Nacional, Rio de Janeiro, RJ, Brazil.. inescg.bio@gmail.com.
authors.forename: Inês C
authors.initials: IC
authors.lastname: Gonçalves
authors.forename: Janice G
authors.initials: JG
authors.lastname: Peters
mesh_terms: D000818:Animals; D003116:Color; D065133:Ephemeroptera / Q000033:anatomy & histology / Q000145:classification*; D005260:Female; D008296:Malaysia; D008297:Male; D009758:Nymph; D010063:Ovum; D014921:Wings, Animal
keywords: Ephemeroptera, Borneo; Oriental Region; Polyplocia nebulosa sp. nov.; Sabah; egg scanning microscopy; identification key