title: A new genus and two new species of Opilioacaridae (Acari: Parasitiformes) from Amazonia, Brazil with a key to world genera.
abstract: Collections of Opilioacaridae made close to 50 years ago in Manaus in the Amazonian Region have allowed the description of a new genus and two new species from Brazil, Amazonacarus setosus n.gen, n.sp. and A. paraensis n.gen, n.sp. These species show a unique combination of characters in the Opilioacaridae: a high number of foliate setae (10) on the palp tarsus with each seta bearing many lobes (6-7), a group of large, serrate setae (26-31) on the palp tibia (this group of setae is much smaller in other species), and 5-7 dorsal setae on idiosomal segment XVIII. Indiacarus and some Opilioacarus show 3-5 setae on segment XVIII, but these genera (and Caribeacarus) have fewer foliate setae on the palp (3-4). Females of Amazonacarus have an ovipositor of the "complex" type, with spiny projections and 2-4 genital setae, while males have two pairs of rounded, large glands.
authors.affiliation: University of Quintana Roo, Division de Ciencias e Ingenierias, Chetumal, Quintana Roo, Mexico.; Email: marvazqu@uqroo.mx.
authors.forename: Ma Magdalena
authors.initials: MM
authors.lastname: Vázquez
authors.affiliation: Programa de Pós-Graduação em Biologia Animal, Departamento de Zoologia e Botânica, IBILCE, Universidade Estadual Paulista (UNESP) Rua Cristóvão Colombo 2265, CEP 15054-000, São José do Rio Preto, SP, Brazil.; Email: marcelsantosa@gmail.com.
authors.forename: Marcel Santos
authors.initials: MS
authors.lastname: De Araújo
authors.affiliation: Departamento de Zoologia e Botânica, Instituto de Biociências, Letras e Ciências Exatas (IBILCE), Universidade Estadual Paulista (UNESP), Rua Cristóvão Colombo 2265, São José do Rio Preto CEP 15054-000, Brazil.; Email: reinaldo@ibilce.unesp.br.
authors.forename: Reinaldo José Fazzio
authors.initials: RJ
authors.lastname: Feres
mesh_terms: D000053:Acari / Q000033:anatomy & histology / Q000145:classification*; D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D001938:Brazil; D017753:Ecosystem; D005260:Female; D008297:Male