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| Hyphessobrycon ribeiroi Lima, Silva-Oliveira, Oliveira & Faria, 2025 |
Abstract
A new species of Hyphessobrycon is described from the region of the lower rioTapajós basin, state of Pará, and tributaries of the northern bank of the Amazon River from the rio Itapiranga basin westward to the lower rio Negro basin, states of Amazonas and Roraima, Brazil. The new species exhibits a color pattern consisting in a conspicuous single humeral blotch and a conspicuous caudal peduncle blotch, a pattern shared with several congeners. It can be diagnosed from those congeners by some other pigmentary features, and from some of them by maxillary teeth, and/or branched anal-fin rays counts, anal-fin morphology, and fin hooks arrangement in matures males.The new species is most similar morphologically to a non-congener, Hemigrammus schmardae, with which it was found syntopically at the lower rio Negro but can be distinguished from it by some color pattern features. An analysis based on the cytochrome c oxidase I gene indicates that the new species is closely related to Hyphessobrycon ericae.
Keywords: Barcoding; Hemigrammus schmardae ; Hyphessobrycon ericae ; rio Tapajós; rio Negro
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| Hyphessobrycon ribeiroi, new species, living aquarium specimens, no locality data. |
Hyphessobrycon ribeiroi, new species
Diagnosis: Hyphessobrycon ribeiroi can be distinguished from most species currently assigned to the genera Hyphessobrycon and Hemigrammus, except He. hyanuary, He. levis, He. melanochrous, He. schmardae, He. vorderwinkleri, Hy. duragenys, Hy. eos, Hy. ericae, Hy. frankei, Hy. langeanii, Hy. santae, Hy. reticulatus, Hy. rutiliflavidus, Hy. tenuis, Hy. tropis, Hy. uaiso, Hy. wosiackii, and Hy. zoe by the presence of single humeral blotch and a caudal peduncle blotch extending into the basis of the middle caudal fin rays (vs. two humeral blotches or absence of a blotch in the humeral region or caudal peduncle). It can be distinguished from aforementioned species, except Hy. ericae and Hy. wosiackii, by possessing a vertically elongated humeral blotch with a posterior backward extension (vs. humeral blotch never presenting a posterior backward extension). The new species can be diagnosed from ...
Etymology: The specific epithet is a homage to Frank Raynner Ribeiro, professor of the Universidade Federal do Oeste do Pará, as a recognition of its contribution to the knowledge of South American Siluriformes and also the fishes from the rio Tapajós basin.
Flávio C.T. Lima, Cárlison Silva-Oliveira, Claudio Oliveira and Tiago C. Faria. 2025. A New Hyphessobrycon (Characiformes: Acestrorhamphidae) from the Central Amazon Basin, Brazil. Papéis Avulsos De Zoologia. 65; e202565011. DOI: 10.11606/1807-0205/2025.65.011
