Hisonotus is a genus of armored catfishes native to South America. Species of Hisonotus and Curculionichthys are the only representatives of the subfamilyOtothyrinae having serrae on the posterior edge of the pectoral fin spine.[1] These species are small fishes, generally found in small fast flowing streams, where they grasp to the branches and leaves of aquatic or subaquatic plants.[2] The species of this genus mostly occur in Atlantic coastal streams of southern Brazil and the Paraguay-Paraná system of
southern South America.[3] They are also distributed in the Río de La Plata basin and coastal rivers of southeastern Brazil.[2]
Taxonomy
Hisonotus and Microlepidogaster have, until recently, been considered as synonymous, although they are now recognized as separate and valid taxa.[4] In the most recent phylogenetic hypotheses, both Hisonotus and Parotocinclus are relatively basal taxa within the Otothyrini clade.[3]
Species
There are currently 34 recognized species in this genus:
^Silva, G.S.C., Roxo, F.F. & Oliveira, C. (2014): Hisonotus acuen, a new and phenotypically variable cascudinho (Siluriformes, Loricariidae, Hypoptopomatinae) from the upper rio Xingu basin, Brazil. ZooKeys, 442: 105–125.
^Roxo, F.F., Silva, G.S.C., Waltz, B.T. & Melo, J.E.G. (2016): A new species of Hisonotus (Siluriformes: Otothyrinae) from the upper rio Paraná and rio São Francisco basins, Brazil. Zootaxa, 4109 (2): 227–238.
^Roxo, F.F., Silva, G.S.C., Oliveira, C. & Zawadzki, C.H. (2013): Hisonotus bocaiuva, a new species from the rio São Francisco basin, Brazil (Teleostei: Loricariidae). Ichthyological Exploration of Freshwaters, 23 (4): 319-326.
^Carvalho, M. & Datovo, A. (2012): A New Species of Cascudinho of the Genus Hisonotus (Siluriformes: Loricariidae: Hypoptopomatinae) from the Upper Rio Tapajós Basin, Brazil. Copeia, 2012 (2): 266-275.
^Roxo, F F et al. "Hisonotus devidei, a new species from the São Francisco basin, Brazil (Siluriformes: Loricariidae)." Journal of fish biology vol. 92,6 (2018): 1687-1701. doi:10.1111/jfb.13599
^ abMartins, F.O. & Langeani, F. (2016): Redescription of Hisonotus notatus Eigenmann & Eigenmann, 1889 (Loricariidae: Hypoptopomatinae), the type species of the genus, and description of a new species from coastal drainages of southeastern Brazil. Neotropical Ichthyology, 14 (2): e150100.
^Zawadzki, C.H., Roxo, F.F. & da Graça, W.J. (2016): Hisonotus pachysarkos, a new species of cascudinho from the rio Ivaí basin, upper rio Paraná system, Brazil (Loricariidae: Otothyrinae). Ichthyological Exploration of Freshwaters, 26 (4): 373-384.
