Abstract
A new species of Parotocinclus is described from three small tributaries of the rio Tapajós basin, Mato Grosso State, Brazil. The new species can be distinguished from its congeners by presenting the following characters: (1) a triangular dark blotch at the anterior base of the dorsal fin, (2) the absence of an adipose fin but presence of one small platelet at typical adipose-fin region, (3) the abdomen completely covered by dermal plates, (4) a pectoral girdle totally exposed, (5) a single series of bicuspid teeth, and (6) the higher number of bicuspid premaxillary and dentary teeth.
Highlights
The subfamily Hypoptopomatinae currently includes the tribes Otothyrini, Neoplecostomini, and Hypoptopomatini and is one of the most diversified and widespread groups of the Neotropical family Loricariidae, with about 210 species according to Eschmeyer and Fong (2016)
Lehmann et al (2014, 2015) proposed that several species included in Parotocinclus, namely: P. amazonensis Garavello, 1977; P. britskii Boeseman, 1974; P. collinsae Schmidt & Ferraris, 1985; P. eppleyi Schaefer & Provenzano, 1993; P. halbothi Lehmann, Lazzarotto & Reis, 2014; P. longirostris Garavello, 1988; P. polyochrus Schaefer, 1988; and P. variola Lehmann, Schvambach & Reis, 2015, could be part of a new genus
Lehmann et al (2014, 2015) proposed that the species P. amazonensis, P. britskii, P. collinsae, P. eppleyi, P. halbothi, P. longirostris, P. polyochrus, and P. variola should be part of a new genus of Otothyrini based on the following synapomorphies (1) presence of a triangular dark blotch at the anterior base of the dorsal fin, (2) canal cheek plate on the ventral surface of the head elongated posteriorly and contacting the cleithrum, and (3) head and snout elongated and with a Y-shaped, white or cream colored mark dorsally
Summary
The subfamily Hypoptopomatinae currently includes the tribes Otothyrini, Neoplecostomini, and Hypoptopomatini (sensu Lujan et al 2015) and is one of the most diversified and widespread groups of the Neotropical family Loricariidae, with about 210 species according to Eschmeyer and Fong (2016). Lehmann et al (2014, 2015) proposed that several species included in Parotocinclus, namely: P. amazonensis Garavello, 1977; P. britskii Boeseman, 1974; P. collinsae Schmidt & Ferraris, 1985; P. eppleyi Schaefer & Provenzano, 1993; P. halbothi Lehmann, Lazzarotto & Reis, 2014; P. longirostris Garavello, 1988; P. polyochrus Schaefer, 1988; and P. variola Lehmann, Schvambach & Reis, 2015, could be part of a new genus. These authors suggested that this possible new genus could be diagnosed by (1) the presence of a triangular dark blotch at the anterior base of the dorsal fin; (2) a canal cheek plate on the ventral surface of head elongated posteriorly and contacting the cleithrum; and (3) the head and snout being elongated and with a Y-shaped, white or cream colored mark dorsally
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