genus Acnodon
(Jégu & Santos, 1990)
Genus Acnodon forms the sister group to the other two clade. The genera Myleus, Mylesinus, and N. gen. A form and group which receives good support from the molecular data. They are commonly called sheep-pacus. The breast is flat and not serrated; other peculiarities are the very long predorsal spine as well as the aquiline "nose" of the type-species, Acnodon oligacanthus.
Acnodon senai N. sp., described of Rio Jari (Brazil, Amapa), is a species close to A. normani Gosline, 1951 described of Rio Tocantins. These two species have a pointed muzzle, a final mouth and two series of definitely separate teeth of the prémaxillaire. These characters differentiate them from A. oligacanthus (Müller and Troschel, 1844), described of Surinam, at which the muzzle is round, the mouth infère and the coupled series prémaxillaires. The branchiospines, rigid and bordered of a simple membrane at A. normani, flexible and are bordered of a membrane lobulée at A. senai.
Valid Species 2011
|
Acnodon normani Gosline 1951
Amazon, Xingu and Tocantins River basins, Brazil |
Acnodon oligacanthus Muller & Troschel 1844
Northern Guiana Shield rivers: French Guiana, Guyana and Suriname |
Acnodon senai Jegu (M.) and Santos (G. M. dos) 1990
Jari River basin, Brazil |
Specimen shown is holotype A. senai. FIG. 1, INPA 2680. 119,5 mm SL.
REFERENCES
GOSLINE, W. A. 1951 (7 Mar.) Notes on the characid fishes of the subfamily Serrasalminae. Proc. Calif. Acad. Sci. (Ser. 4) v. 27 (no. 2): 17-64.
GÉRY, J. 1972 (19 Dec.) Poissons characoïdes des Guyanes. I. Généralités. II. Famille des Serrasalmidae. Zool. Verh. (Leiden) No. 122: 1-250, Pls. 1-16.
JÉGU, M. & G. M. DOS SANTOS, 1990.- Description d'Acnodon senai n. sp. du Rio Jari (Brésil, Amapá) et redescription d'A.normani (Teleostei, Serrasalmidae). Cybium, 14 (3): 187-206.
LEITE, R. G. & M. JÉGU, 1990.- Régime alimentaire de deux espèces d'Acnodon (Characiformes, Serrasalmidae) et habitudes lJpidophages de A.normani. Cybium, 14 (4): 353-359.
VARI, R. P. and J. C. HOWE 1991 Catalog of type specimens of Recent fishes in the National Museum of Natural History, Smithsonian Institution. 1. Characiformes (Teleostei, Ostariophysi). Smithson. Contrib. Zool. No. 517: 1-52.
Jégu, M. and G. M. dos Santos 2002 Révision du statut de Myleus setiger Müller & Troschel, 1844 et de Myleus knerii (Steindachner, 1881) (Teleostei: Characidae: Serrasalmidae) avec une description complémentaire des deux espèces. Cybium v. 26 (no. 1): 33-57.
Reis, R. E., S. O. Kullander and C. J. Ferraris, Jr. 2003 Check list of the freshwater fishes of South and Central America. Check list Freshw. Fishes South & Cent. Amer. 2003: i-xi + 1-729.
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UPDATED: 12/28/2011
