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Two new tétras species (Pisces, Characidae auct., Tetragonopterinae) from Paraguay: Hyphessobrycon arianae n. sp. and Hemigrammus mahnerti n. sp. —Two new very small species from eastern Paraguay are described: Hyphessobrycon arianae n. sp. (Rio Monday basin) and Hemigrammus mahnerti n. sp. (several localities). Their affinities are briefly discussed.

revue suisse de zoologie

Deux nouvelles especes de tetras (poissons characoides, Characidae auct. Tetragonopterinae) du Paraguay: Hyphessobrycon arianae n. sp. et Hemigrammus mahnerti n. sp