Abstract
A new species of Melanorivulus, belonging to the Melanorivulus zygonectes species group, is described from the rio Galera, a tributary of the right bank of the upper rio Guaporé, Amazon basin, Mato Grosso state, Brazil. It is diagnosed from congeners by the following combination of characters: absence of pelvic fins; presence of a black band along the entire caudal-fin margin in males, typically more conspicuous on dorsal and ventral portions; presence of a wide oblique bars anteriorly and wide chevron-like marks posteriorly to middle of flank. This is the first record of the genus Melanorivulus for the rio Madeira basin.
Reference28 articles.
1. Ávila, M.A., Souza, S.R., Veloso, M.D.M., Santos, R.M., Fernandes, L.A. & Nunes, Y.R.F. (2016) Structure of natural regeneration in relation to soil properties and disturbance in two swaps forests. CERNE, 22, 1–10. https://doi.org/10.1590/01047760201622012086
2. Bockmann, F.A. & Reis, R.E. (2021) Two new, remarkably colored species of the neotropical catfish genus Cetopsorhamdia Eigenmann & Fisher, 1916 (Siluriformes, Heptapteridae) from Chapada dos Parecis, western Brazil, with an assessment of the morphological characters bearing on their phylogenetic relationships. Papéis Avulsos de Zoologia, 61 (e20216156), 1–33. https://doi.org/10.11606/1807-0205/2021.61.56
3. Costa, W.J.E.M. (1995a): Revision of the Rivulus punctatus species complex (Cyprinodontiformes: Rivulidae). Ichthyological Exploration of Freshwaters, 6, 207–226.
4. Costa, W.J.E.M. (1995b) Pearl killifishes: The Cynolebiatinae. Systematics and Biogeography of a Neotropical annual fish subfamily (Cyprinodontiformes: Rivulidae). TFH Publications, Neptune City, 128 pp.
5. Costa, W.J.E.M. (2006) Relationships and taxonomy of the killifish genus Rivulus (Cyprinodontiformes: Aplocheiloidei: Rivulidae) from the Brazilian Amazonas river basin, with notes on historical ecology. aqua, Journal of Ichthyology and Aquatic Biology, 11, 133–175.