Hemigrammus

Hemigrammus is a genus of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American characins. The fishes in this genus are found in South America, including Trinidad, and commonly seen in the aquarium trade. These are medium-small tetras where the largest species reach up to around .

==Species== There are currently 55 recognized species in this genus: Hemigrammus amacayacu Albornoz‐Garzón, Méndez‐López, DoNascimiento & Lima, 2019 Hemigrammus analis Durbin, 1909 Hemigrammus apiaka (Esguícero & Castro, 2017) Hemigrammus arua F. C. T. Lima, Wosiacki & C. S. Ramos, 2009 Hemigrammus ataktos Marinho, D'Agosta & Birindelli, 2014 Hemigrammus barrigonae C. H. Eigenmann & Henn, 1914 Hemigrammus bellottii (Steindachner, 1882) Hemigrammus boesemani Géry, 1959 Hemigrammus brevis Durbin, 1911 Hemigrammus changae Ota, F. C. T. Lima & Hidalgo, 2019 Hemigrammus coeruleus Durbin, 1908 Hemigrammus collettii (Steindachner, 1882) Hemigrammus copei (Steindachner, 1882) Hemigrammus cupreus Durbin, 1918 Hemigrammus cylindricus Durbin, 1909 Hemigrammus diagonicus Mendonça & Wosiacki, 2011 Hemigrammus durbinae Ota, F. C. T. Lima & Pavanelli, 2015 Hemigrammus eigenmanni (Géry, 1964) Hemigrammus elegans (Steindachner, 1882) Hemigrammus erythrozonus Durbin, 1909 (Glowlight tetra) Hemigrammus filamentosus Zarske, 2011 Hemigrammus flavus (Britzke, Troy, Oliveira & Benine, 2018 Hemigrammus gracilis (Lütken, 1875) Hemigrammus grammicus C. H. Eigenmann, 1912 Hemigrammus hyanuary Durbin, 1918 (Costello tetra) Hemigrammus iota Durbin, 1909 Hemigrammus kuroobi Reia & Benine, 2019 Hemigrammus levis Durbin, 1908 Hemigrammus lunatus Durbin, 1918 Hemigrammus machadoi Ota, F. C. T. Lima & Pavanelli, 2014 Hemigrammus mahnerti Uj & Géry, 1989 Hemigrammus marginatus Durbin, 1911 Hemigrammus megaceps Fowler, 1945 Hemigrammus melanochrous Fowler, 1913 Hemigrammus melogrammus C. H. Eigenmann, 1908 Hemigrammus micropterus Meek, 1907 Hemigrammus microstomus Durbin, 1918 Hemigrammus mimus J. E. Böhlke, 1955 Hemigrammus ora Zarske, Le Bail & Géry, 2006 Hemigrammus orthus Durbin, 1909 Hemigrammus parana Marinho, F. R. de Carvalho, Langeani & Tatsumi, 2008 Hemigrammus pretoensis Géry, 1965 Hemigrammus rodwayi Durbin, 1909 (Gold tetra) Hemigrammus rubrostriatus Zarske, 2015 Hemigrammus schmardae (Steindachner, 1882) Hemigrammus silimoni Britski & F. C. T. Lima, 2008 Hemigrammus stictus (Durbin, 1909) Hemigrammus taphorni Benine & G. A. M. Lopes, 2007 Hemigrammus tocantinsi F. R. de Carvalho, Bertaco & Jerep, 2010 Hemigrammus tridens C. H. Eigenmann, 1907 Hemigrammus tupebas (Esguícero & Castro, 2017) Hemigrammus ulreyi (Boulenger, 1895) Hemigrammus unilineatus (T. N. Gill, 1858) (Feather-fin tetra) Hemigrammus vorderwinkleri Géry, 1963 Hemigrammus xaveriellus Lima, Urbano-Bonilla & Prada-Pedreros, 2020