Hemiodus
Hemiodus is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná–Paraguay and Parnaíba River basins. Depending on the species involved, these elongate fish reach a length of.
Fossil remains are known from the Middle Miocene-aged Pebas Formation of Peru.
Species
Hemiodus has the following species classified within it:Hemiodus amazonum Hemiodus argenteus Pellegrin, 1909Hemiodus atranalis Hemiodus bimaculatus Nogueira, Langeani & Netto‐Ferreira, 2019Hemiodus goeldii Steindachner, 1908Hemiodus gracilis Günther, 1864Hemiodus huraulti Hemiodus immaculatus Kner, 1858Hemiodus iratapuru Langeani & C. L. R. Moreira, 2013Hemiodus jatuarana Langeani, 2004Hemiodus langeanii Beltrão & Zuanon, 2012Hemiodus microlepis Kner, 1858Hemiodus ocellatus Hemiodus orthonops C. H. Eigenmann & C. H. Kennedy, 1903Hemiodus parnaguae C. H. Eigenmann & Henn, 1916Hemiodus quadrimaculatus Pellegrin, 1909 Hemiodus semitaeniatus Kner, 1858 Hemiodus sterni Hemiodus ternetzi G. S. Myers, 1927Hemiodus thayeria J. E. Böhlke, 1955Hemiodus tocantinensis Langeani, 1999Hemiodus tucupi Silva, Nogueira, Netto-Ferreira, Akama & Dutra, 2020Hemiodus unimaculatus- ''Hemiodus vorderwinkleri''