title: A new species of Allobates (Anura: Aromobatidae) from the Tapajós River basin, Pará State, Brazil.
abstract: We describe a new species of Allobates from the south of eastern Amazonia, Brazil. This species inhabits fluvial springs and the banks of small streams in terra-firme forests along the Tapajós River basin. Average snout-to-vent length is 17.78 mm (range 16.09-19.59 mm) among males and 19.50 mm (range 17.97-20.84 mm) among females. Surface of dorsum is marked by a distinct dark color pattern, with three convex areas, triangle and diamond-shaped. The species has a diffuse pale dorsolateral line (absent in some specimens), while the oblique lateral bar is defined. Dark-brown transversal stripes are present on femoral and tibial dorsal surfaces, which align with each other in live specimens when at rest. Tadpoles have short papillae on anterior (8-10 papillae on each side) and posterior labium (&gt;30 papillae). Posterior labium is projected to the front, hiding posterior tooth rows. Eggs are deposited in nests on rolled or cranked dead leaves on the forest floor. Egg membranes and jelly-nests are transparent. Advertisement calls are mainly characterized by the continuous emission of single notes that might shift sporadically to note-pairs, emitted during short periods. Notes are split by regular silent intervals, with peak frequency ranging between 4273-4867 Hz.
authors.affiliation: Coordenação de Pesquisas em Biodiversidade, Instituto Nacional de Pesquisas da Amazônia, Av. André Araujo 2936, 69011-970, Manaus, Amazonas, Brazil.; Email: lima@inpa.gov.br.
authors.forename: Albertina P
authors.initials: AP
authors.lastname: Lima
authors.affiliation: Coordenação de Pesquisas em Biodiversidade, Instituto Nacional de Pesquisas da Amazônia, Av. André Araujo 2936, 69011-970, Manaus, Amazonas, Brazil. Laboratório de Sistemática de Vertebrados, Pontifícia Universidade Católica do Rio Grande do Sul, Av. Ipiranga 6681, Prédio 40, sala 110, 90619-900, Porto Alegre, RS, Brazil.; Email: pedroivo@inpa.gov.br.
authors.forename: Pedro Ivo
authors.initials: PI
authors.lastname: Simões
authors.affiliation: Instituto de Ciências Biológicas, Universidade Federal do Amazonas, Av. Rodrigo Octávio 6200, 69077-000, Manaus, Amazonas, Brazil.; Email: kaefer@ufam.edu.br.
authors.forename: Igor Luis
authors.initials: IL
authors.lastname: Kaefer
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D001001:Anura / Q000033:anatomy & histology / Q000145:classification* / Q000235:genetics / Q000254:growth & development; D049628:Body Size; D001938:Brazil; D005260:Female; D008297:Male; D009929:Organ Size