Rafaela Ota

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Papers by Rafaela Ota

Hemigrammus machadoi Ota & Lima & Pavanelli 2014, new species

Hemigrammus machadoi, new species Figs. 1-3 Hemig... more Hemigrammus machadoi, new species Figs. 1-3 Hemigrammus lunatus Durbin in Eigenmann, 1918: 165 [part; "rio Boa Ventura"]. Hemigrammus sp. "falso lunatus" Lima et al., 2013: 272-273 [Brazil, rio Madeira basin: photo, short description, diagnosis, habitat preferences, distribution in the rio Madeira basin]. Holotype. INPA 39889, 30.4 mm SL, Brazil, Mato Grosso State, Pontes e Lacerda, igarapé Barreiro, tributary of rio Guaporé, rio Madeira basin, road to Vila Bela da Santíssima Trindade, 15°11'34"S 59°25'26"W, 13 Dec 2011, W. M. Ohara. Paratypes. All from Brazil. Rondônia State, rio Madeira basin : ANSP 194408, 2, 28.2 -29.0 mm SL, Cerejeiras, igarapé Azul, about 10 km on road RO-399, 13º19'09"S 61º03'16"W, 2 Sep 2011, W. M. Ohara &amp; G. Torrente Vilara; INPA 24098, 1, 26.2 mm SL, Guajará- Mirim, middle rio Cautário, 12º05'06"S 64º37'58"W, 12 Jul 2003, G. Torrente Vilara; INPA 39892, 1, 35.2 mm SL, Guajará-Mirim, rio Pacaás Novos, 10º56'15"S 65º14'11"W, 17 Jan 2012, W. M. Ohara; MCP 47946, 1, 28.0 mm SL, Jaci-Paraná, stream tributary of rio Madeira, road BR-364, 09º28'41''S 64º46'23''W, 19 Jul 2004, F. Langeani, F. C. T. Lima, E. H. L. Pereira &amp; R. E. Reis; UFRO-I 11226, 2, 22.3 -25.0 mm SL, Cerejeiras, igarapé do Trevo, tributary of rio Guaporé, 13º11'38"S 60º56'59"W, 2 Sep 2011, W. M. Ohara &amp; G. Torrente Vilara; UFRO-I 11317, 3, 20.4-22.9 mm SL, Cerejeiras, igarapé tributary of rio Guaporé, road RO-399, 13º20'02"S 60º54'16"W, 2 Sep 2011, W. M. Ohara &amp; G. Torrente Vilara; UFRO-I 11571, 2, 24.7-28.5 mm SL, Cerejeiras, igarapé Azul, about 10 km on road RO-399, 13º19'09"S 61º03'16"W, 2 Sep 2011, W. M. Ohara &amp; G. Torrente Vilara; UFRO-I 11712, 6, 26.9- 32.2 mm SL, Corumbiara, igarapé at Estrada dos Bois, tributary of rio Corumbiara, 12º59'54"S 61º08'52"W, 1 Sep 2011, W. M. Ohara; UFRO-I 14036, 2, 25.6-25.7 mm SL, Guajará-Mirim, rio Pacaás Novos, 10º56'15"S 65º14'11"W, 17 Jan 2012, W. M. Ohara; ZUEC 7637, 1, 32.6 mm SL, Ariquemes, stream [...]

FIGURE 1 in Description of a new Hemigrammus Gill (Characiformes: Characidae) from the río Madeira basin in Peru and Bolivia

FIGURE 1. Hemigrammus changae. (A), MUSM 663836, 29.9 mm SL, holotype; (B) CAS 246141, 27.2 mm SL... more

Comparative cytogenetics of Serrasalmidae (Teleostei: Characiformes): The relationship between chromosomal evolution and molecular phylogenies

PLOS ONE

Serrasalmidae has high morphological and chromosomal diversity. Based on molecular hypotheses, th... more Serrasalmidae has high morphological and chromosomal diversity. Based on molecular hypotheses, the family is currently divided into two subfamilies, Colossomatinae and Serrasalminae, with Serrasalminae composed of two tribes: Myleini (comprising most of pacus species) and Serrasalmini (represented by Metynnis, Catoprion, and remaining piranha’s genera). This study aimed to analyze species of the tribes Myleini (Myloplus asterias, M. lobatus, M. rubripinnis, M. schomburgki, and Tometes camunani) and Serrasalmini (Metynnis cuiaba, M. hypsauchen, and M. longipinnis) using classical and molecular cytogenetic techniques in order to understand the chromosomal evolution of the family. The four species of the genus Myloplus and T. camunani presented 2n = 58 chromosomes, while the species of Metynnis presented 2n = 62 chromosomes. The distribution of heterochromatin occurred predominantly in pericentromeric regions in all species. Tometes camunani and Myloplus spp. presented only one site wi...

Redescription of Moenkhausia melogramma (Characiformes: Characidae), a poorly known tetra from the western Amazon basin

Neotropical Ichthyology

Moenkhausia melogramma is herein redescribed, based on the examination of the holotype plus addit... more Moenkhausia melogramma is herein redescribed, based on the examination of the holotype plus additional specimens from the western Amazon basin in Brazil, Colombia, Peru, and Ecuador. Moenkhausia melogramma shares with M. collettii, M. conspicua, M. copei, M. venerei, and M. flava a broad dark longitudinal stripe across the eye, and a well-defined dark stripe on the anal-fin base. It can be promptly distinguished from these species by having two humeral blotches. Additionally, we provide comments on the putative relationships of Moenkhausia melogramma with the aforementioned congeners and the Hemigrammus lunatus species-group.

Rafaela Ota

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