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Volume 22, Issue 2 – 18 April 2016


Volume 22, Issue 2 – 18 April 2016
New Scientific publication – started delivery on April 18, 2016

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Stefano Valdesalici and Wolfgang Eberl: Aphyosemion bitteri (Cyprinodontiformes: Nothobranchiidae), a new killifish species from the northern Massif du Chaillu, Gabon, pp. 61-68

A new Aphyosemion species is described from Gabon, based on eight specimens collected in a small stream within the hydrographic system of the Ikoy River on the northwestern edge of the Massif du Chaillu. Aphyosemion bitteri, new species, can be distinguished from all species of the genus by its maze-like red pattern on the caudal fin. It belongs to the A. grelli species group (Valdesalici & Eberl 2014) by sharing with A. grelli and A. mengilai the yellow basal two thirds and the greyish marginal third on the unpaired fins of females, but it can be easily distinguished from these two species by differing male coloration and meristics.

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Aphyosemion bitteri, paratype, MSNG 58338, female, 27.3 mm SL. Gabon, Province de la Ngounié, Ikoy River system. Photo by W. Grell.



Dalton Tavares Bressane Nielsen, Arsênio Caldeira Baptista Junior and Leendert van de Berg: Anablepsoides hoetmeri, a new rivulid (Cyprinodontiformes: Rivulidae) from Rio Purus drainage, western Amazon basin, Brazil, pp. 69-78

Anablepsoides hoetmeri, new species, is described from middle rio Acre, a tributary of the rio Purus, Amazon drainage, Brazil. It is the first species of Anablepsoides described from that basin and the second species belonging to the Anablepsoides limoncochae species group described from Brazil. The remaining species belonging to the A. limoncochae group are mainly found in Peru, but also occur in Colombia and Ecuador. Anablepsoides hoetmeri n. sp. differs other members of the A. limoncochae group by having two longitudinal rows of 18-20 minute contact organs per row on the sides of the body, and by the coloration patterns of both males and females.

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Anablepsoides hoetmeri, ZUEC 12540, holotype, male, 47.8 mm SL. Photo by J. W. Hoetmer.



Dalton Tavares Bressane Nielsen, Pedro Alvaro Barbosa Aguiar Neves, Eric Venturini Ywamoto and Michel de Aguiar Passos: Melanorivulus polychromus, a new species of killifish from the rio São José dos Dourados drainage, middle rio Paraná basin, southwestern Brazil, with a redescription of Melanorivulus apiamici (Cyprinodontiformes: Rivulidae), pp. 79-88

A new species of Melanorivulus is described from the middle rio Paraná basin, São Paulo state, Brazil. Melanorivulus polychromus, new species, is found in a tributary of the left bank of the rio Paraná basin, the rio São José dos Dourados. It differs from all congeners by the combination of a metallic green to light green ground colour in males, with 6-8 oblique red bars forming chevronlike rows, the chevron tips along the midline of the body pointing toward the head, and irregular narrow red lines and incomplete red bars along the lower half of the body. Melanorivulus apiamici, also endemic from the middle rio Paraná basin, is redescribed.

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Melanorivulus polychromus, MZUSP 119054, holotype, male,  26.1 mm SL. Photo by P. A. Barbosa Aguiar Neves.



Flávio. C. T. Lima and Nelson Flausino Junior: Hyphessobrycon vanzolinii, a new species from rio Tapajós, Amazon basin, Brazil (Characiformes: Characidae), pp. 89-95

Hyphessobrycon vanzolinii, new species, is described from the rio Tapajós, Amazon basin, Pará state, Brazil. The new species can be diagnosed from all its congeners by its unique colour pattern, consisting of a longitudinal, broad, diffuse dark midlateral stripe extending from the snout through the orbit to the base of the middle caudal fin rays, dark pigmentation on the last unbranched ray and first to second branched rays of the dorsal fin, a distal dark stripe along the margin of the anal fin, and the presence of dark pigmentation along the distal margin of the caudal fin. Remarks on the putative relationships of the new species, as well as about the threat posed by a large dam to be build exactly at the only site from where Hyphessobrycon vanzolinii is so far known, are presented.

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Hyphessobrycon vanzolinii, holotype, MZUSP 119105, 32.4 mm SL; Brazil, Pará, rio Tapajós, near São Luís. Photo by G. N. Salvador.

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