title: Squamasnema amazonica n. gen. n. sp. (Heligmonellinae): A new parasite of Proechimys roberti (Rodentia: Echimyidae) in the Brazilian Amazon.
abstract: A new species of nematode, Squamasnema amazonica n. gen. n. sp., is described based on specimens found parasitizing the small intestine of Proechimys roberti (Rodentia: Echimyidae) collected during a survey of the fauna of Tapirapé-Aquirí National Forest (Brazil, Eastern Brazilian Amazon). The nematodes were fixed and processed for light microscopy and scanning electron microscopy (SEM). These nematodes were classified under the family Heligmonellidae and the subfamily Heligmonellinae. Although several species in the family Heligmonellidae exhibit discontinuous ridges, Squamasnema n. gen. and Trichotravassosia are the only genera with columns of scales along their entire body, as an apomorphy of the synlophe. Squamasnema n. gen. has columns of cuticular cells along its body, except for on the left flank, and exhibits a synlophe with no size gradient or inclination and does not present chitinized structures supporting the synlophe. Therefore, due to these morphological differences of Squamasnema n. gen., the creation of a new genus was necessary.
authors.affiliation: Laboratory of Cell Biology and Helminthology "Profa. Dra. Reinalda Marisa Lanfredi," Institute of Biological Sciences, Federal University of Pará (Universidade Federal do Pará, UFPA), Augusto Corrêa, 01-Guamá, Belém 66075-110, PA, Brazil.
authors.forename: Helrik da Costa
authors.initials: Hda C
authors.lastname: Cordeiro
authors.affiliation: Laboratory of Cell Biology and Helminthology "Profa. Dra. Reinalda Marisa Lanfredi," Institute of Biological Sciences, Federal University of Pará (Universidade Federal do Pará, UFPA), Augusto Corrêa, 01-Guamá, Belém 66075-110, PA, Brazil.
authors.forename: Francisco Tiago de Vasconcelos
authors.initials: FT
authors.lastname: Melo
authors.affiliation: Laboratory of Cell Biology and Helminthology "Profa. Dra. Reinalda Marisa Lanfredi," Institute of Biological Sciences, Federal University of Pará (Universidade Federal do Pará, UFPA), Augusto Corrêa, 01-Guamá, Belém 66075-110, PA, Brazil.
authors.forename: Adriano Penha
authors.initials: AP
authors.lastname: Furtado
authors.affiliation: Laboratory of Animal Embryology and Histology, Institute of Animal Production and Health, Federal Rural University of the Amazon (Universidade Federal Rural da Amazônia, UFRA), Av. Perimetral, 2501-Montese, Belém 66077-901, PA, Brazil.
authors.forename: Elane Guerreiro
authors.initials: EG
authors.lastname: Giese
authors.affiliation: Laboratory of Wild and Reservoir Mammal Biology and Parasitology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation. Avenida Brasil, 4365 Pavilhão Arthur Neiva, sala 14, Manguinhos, Rio de Janeiro 21040-360, RJ, Brazil.
authors.forename: Arnaldo
authors.initials: A
authors.lastname: Maldonado
authors.affiliation: Laboratory of Cell Biology and Helminthology "Profa. Dra. Reinalda Marisa Lanfredi," Institute of Biological Sciences, Federal University of Pará (Universidade Federal do Pará, UFPA), Augusto Corrêa, 01-Guamá, Belém 66075-110, PA, Brazil. Electronic address: jeannie@ufpa.br.
authors.forename: Jeannie Nascimento
authors.initials: JN
authors.lastname: dos Santos
mesh_terms: D000818:Animals; D001938:Brazil; D005260:Female; D008297:Male; D009348:Nematoda / Q000033:anatomy & histology / Q000145:classification* / Q000648:ultrastructure; D051381:Rats; D012376:Rodent Diseases / Q000469:parasitology*; D012377:Rodentia / Q000469:parasitology*
keywords: Brazilian Amazon; Heligmonellinae; Proechimys roberti; Rodents; Squamasnema amazonica