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Integrative Taxonomy Reveals a New Species of the Hoplias Malabaricus Species Complex (Teleostei: Erythrinidae)

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Integrative Taxonomy Reveals a New Species of the Hoplias Malabaricus Species Complex (Teleostei: Erythrinidae) 1 Ichthyological Exploration of Freshwaters/IEF-1076/pp. 1-18 Published 2 August 2018 LSID: http://zoobank.org/urn:lsid:zoobank.org:pub:D86F1F17-D310-4D18-A8BB-94C0FA70759E DOI: http://doi.org/10.23788/IEF-1076 Integrative taxonomy reveals a new species of the Hoplias malabaricus species complex (Teleostei: Erythrinidae) Juan J. Rosso*, ****, Mariano González-Castro*, ****, Sergio Bogan**, Yamila P. Cardoso***, ****, Ezequiel Mabragaña*, ****, Matías Delpiani*, **** and Juan M. Díaz de Astarloa*, **** By means of an integrative taxonomic approach, a new species of the H. malabaricus group from the Río de La Plata basin is described. Hoplias argentinensis, new species, is characterized by: 17-19 predorsal scales, 42-43 ver- tebrae, 20 scales around caudal peduncle, no distinctive brown bands in lower jaw, last series of vertical scales on caudal fin nearly straight, 41-44 lateral-line scales and snout width (18.4-24.9 % of SL). Hoplias argentinensis is discriminated from all other species of the H. malabaricus group by means of traditional characters, landmarks- based morphometrics and genetics. A key to species of the Hoplias malabaricus group is provided. Introduction (Oyakawa, 2003). Hoplias, the most species-rich genus within Erythinid fishes, comprises 13 valid With more than 5100 species, Neotropical fresh- species (Eschmeyer et al., 2017). Species of Hoplias water fishes represent about one-third of all can be morphologically discriminated into three freshwater fishes worldwide, albeit some es- different groups by means of the arrangement timates regard a final diversity between 8000 of medial margins and number of latero-sensory and 9000 species (Reis et al., 2016). Wolf fishes pores of dentaries and the presence of tooth plates of the family Erythrinidae are predator fishes on basihyal and basibranchial bones (Oyakawa, that inhabit a large array of aquatic ecosystems 1990; Oyakawa & Mattox, 2009; Mattox et al., throughout South America and comprise three 2006). One of these groups, the Hoplias malabaricus genera: Erythrinus, Hoplerythrinus and Hoplias species group, includes Hoplias malabaricus, which * Grupo de Biotaxonomía Morfológica y Molecular de Peces, Instituto de Investigaciones Marinas y Costeras (IIMyC), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, CONICET, Funes 3350, (7600) Mar del Plata, Argentina. JJR (corresponding author). E-mail: [email protected] ** Fundación de Historia Natural “Félix de Azara”. Departamento de Ciencias Naturales y Antropología. Uni- versidad Maimónides. Hidalgo 775, piso 7. 1405-BDB Buenos Aires, Argentina *** Laboratorio de Sistemática y Biología Evolutiva (LASBE), Facultad de Ciencias Naturales y Museo, Univer- sidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA, La Plata, Buenos Aires, Argentina **** Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2290, C1425FQB, Buenos Aires, Argentina Ichthyol. Explor. 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