Abstract
ABSTRACT A new species of Hyphessobrycon belonging to the Hyphessobrycon heterorhabdus species-group from the lower rio Tapajós, state of Pará, Brazil, is described. The new species is allocated into the Hyphessobrycon heterorhabdus species-group due to its color pattern, composed by an anteriorly well-defined, horizontally elongated humeral blotch that becomes diffuse and blurred posteriorly, where it overlaps with a conspicuous midlateral dark stripe that becomes blurred towards the caudal peduncle and the presence, in living specimens, of a tricolored longitudinal pattern composed by a dorsal red or reddish longitudinal stripe, a middle iridescent, golden or silvery longitudinal stripe, and a more ventrally-lying longitudinal dark pattern composed by the humeral blotch and dark midlateral stripe. It can be distinguished from all other species of the group by possessing humeral blotch with a straight or slightly rounded ventral profile, lacking a ventral expansion present in all other species of the group. The new species is also distinguished from Hyphessobrycon heterorhabdus by a 9.6% genetic distance in the cytochrome c oxidase I gene. The little morphological distinction of the new species when compared with its most similar congener, H. heterorhabdus, indicates that the new species is one of the first truly cryptic fish species described from the Amazon basin.
Highlights
Instituto Superior de Ciências de Educação da Huíla (ISCED-Huíla), Lubango [ex Sá da Bandeira]
Note: amphibian specimens transferred to Western Australian Museum (WAM); audio recordings of frogs curated by Centre of Excellence in Natural Resource Management, University Western Australia
In 2000; CEPTA administered by Instituto Chico Mendes de Conservação da Biodiversidade (ICMBio) since 2007; Experimental de Biologia e Piscicultura de Pirassununga (EEBP) fish collection assembled by Otto São Paulo
Summary
Faculté des Sciences Biologiques (FSB), Université des sciences et de la technologie Houari-Boumediene (USTHB), Bab Ezzouar. Fossils from Zarzaïtine Series deposited at Musée de la Faculté des Sciences de la Terre de la Géographie et de l’Aménagement du Territoire (FSTGAT), Université des sciences et de la technologie Houari-Boumediene (USTHB), Bab Ezzouar. Includes: collections of Instituto de Investigação Científica de Angola (IICA). Note: descended from Angolan Museum founded in 1938 and established in São Miguel Fort in Luanda Bay area. Note: "Iológicas" correct, derived from Greek word for venom; institution founded by Avelino Barrio; closed in 1979, herps (including types) transferred to MACN. Includes: fish collection formerly at Instituto de Limnología "Dr Raúl A. Current as: CFAIC (fishes), CFA-AN (amphibians), CFA-RE (reptiles). Instituto Antártico Argentino, Museo Antártico de la Fundación Marambio, Buenos Aires.
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