Abstract
Utiaritichthysesguiceroi is described from the upper portion of the rio Juruena, rio Tapajós drainage, Mato Grosso State, Central Brazil. The new species distinguished from its two congeners, U. sennaebragai Miranda Ribeiro and U. longidorsalis Jégu, Tito de Morais & Santos, by having 99 to 101 perforated scales on lateral line (vs. 69 to 83), presence of 17 to19 prepelvic spines (vs. 9-13 in U. sennaebragai and 28-31 in U. longidorsalis), 20 to 21 postpelvic spines (vs. 15 to 19 in U. sennaebragai, and 14 in U. longidorsalis), and 23 to 25 circumpeduncular scales (vs. 30-48 in U. sennaebragai, and 33-35 in U. longidorsalis). Furthermore, the new species differs from U. longidorsalis by having larger interdorsal width, and adipose-fin base length (11.8-15.6 vs. 7.1-7.9% of SL, and 4.2-5.8 vs. 3.7-3.8% of SL, respectively).
Highlights
The family Serrasalmidae contains 16 genera and approximately 87 valid recent species, and one fossil species of (Megapiranha paranensis Cione, Dahdul, Lundberg & Machado-Allison) widely distributed throughout Neotropical drainages, mostly in South America (Jégu, 2003; Jégu et al, 2004; Cione et al, 2009; Hubert & Reno, 2010; Andrade et al, 2013; Eschmeyer & Fong, 2014).The real taxonomic level of the group remains unsolved. Machado-Allison (1983, 1986) proposed the monophyly of the serrasalmids, based on 27 morphological characters
Utiaritichthys sennaebragai was described by Miranda Ribeiro (1937) from the rio Papagaio, rio Tapajós drainage, upriver from Salto de Utiariti, Mato Grosso State, Central Brazil
Utiaritichthys sennaebragai is recorded in the rios Tapajós, Xingu, Tocantins-Araguaia and Trombetas, in the Amazon drainage, and in the río Orinoco, in Venezuela; and U. longidorsalis Jégu, Tito de Moraes & Santos, 1992, is known only from the rio Madeira
Summary
The family Serrasalmidae contains 16 genera and approximately 87 valid recent species, and one fossil species of (Megapiranha paranensis Cione, Dahdul, Lundberg & Machado-Allison) widely distributed throughout Neotropical drainages, mostly in South America (Jégu, 2003; Jégu et al, 2004; Cione et al, 2009; Hubert & Reno, 2010; Andrade et al, 2013; Eschmeyer & Fong, 2014). Calcagnotto et al (2005) based on their molecular tree, raised the group to the family level, disagreeing with Machado-Allison (1982, 1983, 1985, 1986). Utiaritichthys sennaebragai was described by Miranda Ribeiro (1937) from the rio Papagaio, rio Tapajós drainage, upriver from Salto de Utiariti (waterfall), Mato Grosso State, Central Brazil. Jégu et al (1992) redescribed the genus and described an additional species, U. longidorsalis, from the rio Aripuanã, rio Madeira drainage, in Central Brazil. A new species of Utiaritichthys was discovered during recent collections made in the rio Juruena, rio Tapajós drainage, in the region of the Chapada dos Parecis, Mato Grosso State, Brazil, and it is described
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