Deep-sea ophidiiform fishes collected on the Brazilian continental slope, between 11 ° and 23 ° S Author Mincarone, Michael M. Museu Oceanográfico Univali, Universidade do Vale do Itajaí, CP 360, 88302 - 202, Itajaí, SC, Brazil. E-mail: mincarone @ univali. br Natural History Museum of Denmark, Zoological Museum, University of Copenhagen, Universitetsparken 15, DK- 2100 Copenhagen Ø, Denmark. E-mail: jgnielsen @ snm. ku. dk Universidade Federal do Estado do Rio de Janeiro, Departamento de Ecologia e Recursos Marinhos, Av. Pasteur, 458, sala 410, Urca, 22290 - 240, Rio de Janeiro, RJ, Brazil. E-mail: pauloascosta @ uol. com. br Author Nielsen, Jørgen G. Author Costa, Paulo A. S. Author Rv, Rv text Zootaxa 2008 2008-05-16 1770 1 41 64 https://biotaxa.org/Zootaxa/article/view/zootaxa.1770.1.2 journal article 10.11646/zootaxa.1770.1.2 1175­5334 5123954 0F66DF83-9427-4D01-A0A8-6CC4B2A81F32 Acanthonus Günther 1878 Type species. Acanthonus armatus Günther 1878 , by monotypy. Diagnosis. Ophidiid with large head; snout with prominent, bifid spine; opercular spine long and slender extending well beyond rear margin of head, well developed spines at lower angle of preopercle; eye small; 1 to 4 median basibranchial tooth patches; pectoral fin-rays 16–19, pelvic fin-rays 2; 16 to 22 developed gill rakers; precudal vertebrae 9–10.