Corumbataia acanthodela, new species

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Corumbataia acanthodela, new species

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Thimotheo MGR, Benine RC, Oliveira C, Silva GSC. (2020). New species of the Corumbataia cuestae group (Siluriformes: Loricariidae) from the Rio Tocantins basin, with comments on its phylogenetic relationships. Neotrop Ichthyol., 18(4):e200060.

https://doi.org/10.1590/1982-0224-2020-0060
https://www.ni.bio.br/v18n4/1982-0224-2020-0060/

, new species
A new species of Corumbataia is described from Rio Maranhão, Rio Tocantins basin, central Brazil. The new species is distinguished from all congeners by the presence of a small, naked area on snout tip; by having the abdomen covered with small platelets forming a shield which reaches the lateral mid-ventral plates; by the anterior profile of the head rounded in dorsal view; by the lower lip not reaching the transversal line of the pectoral girdle; and by the presence of 28 or 29 vertebrae. High genetic divergence in mitochondrial cytochrome c oxidase subunit I (COI) further supports the validity of this new species. Our phylogenetic analysis shows a derived subclade in Corumbataia, herein named as the Corumbataia cuestae group, composed of the new species plus C. cuestae, C. tocantinensis, C. britskii, C. liliai, and C. lucianoi. This group is defined by having a conspicuous crest of hypertrophied odontodes on head; absence of the adipose fin or a single series of platelets at adipose-fin position; and anastomosis of the infraorbital and otic sensory canals over the pterotic-supracleithrum. Here we also restrict the distribution of C. tocantinensis to the Rio Araguaia basin.
  • Keywords: Cytochrome C Oxidase, Diversity, Freshwater fishes, Hypoptopomatinae, Central Brazil
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FIGURE 2 | Corumbataia acanthodela, holotype, MZUSP 125794, male 27.9 mm SL, from Rio Maranhão, Rio Tocantins basin, Niquelândia, Goiás, Brazil.
FIGURE 2 | Corumbataia acanthodela, holotype, MZUSP 125794, male 27.9 mm SL, from Rio Maranhão, Rio Tocantins basin, Niquelândia, Goiás, Brazil.
FIGURE 4 | Frontal view of snout tip showing a naked area without odontodes. A. Corumbataia acanthodela, LBP 19095, paratype; B. Corumbataia cuestae, LBP 1309. Scale bars = 1 mm.
FIGURE 4 | Frontal view of snout tip showing a naked area without odontodes. A. Corumbataia acanthodela, LBP 19095, paratype; B. Corumbataia cuestae, LBP 1309. Scale bars = 1 mm.
FIGURE 5 | Hypertrophied odontodes on the lateral margins of head in Corumbataia acanthodela, paratypes, male (left), NUP 22694 and female (right), LBP 19095. Scale bars = 1 mm.
FIGURE 5 | Hypertrophied odontodes on the lateral margins of head in Corumbataia acanthodela, paratypes, male (left), NUP 22694 and female (right), LBP 19095. Scale bars = 1 mm.
FIGURE 1 | A. Maximum likelihood – ML (LogL = -3132.01) tree of Corumbataia species using TN93+G+I nucleotide substitution model and based on the analysis of partial sequence of cytochrome oxidase C subunit I (COI). Numbers at nodes are bootstrap values based on 1000 pseudoreplicates. Values below 50% are not shown. B. Majority rule consensus tree obtained in Bayesian analysis using GTR+I. Numbers below branches are posterior probabilities obtained from 10000 trees.
FIGURE 1 | A. Maximum likelihood – ML (LogL = -3132.01) tree of Corumbataia species using TN93+G+I nucleotide substitution model and based on the analysis of partial sequence of cytochrome oxidase C subunit I (COI). Numbers at nodes are bootstrap values based on 1000 pseudoreplicates. Values below 50% are not shown. B. Majority rule consensus tree obtained in Bayesian analysis using GTR+I. Numbers below branches are posterior probabilities obtained from 10000 trees.
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