Characidium

Characidium is a genus of fish in the family Crenuchidae (South American darters). They are mainly found in South America, but C. marshi is from Panama. They are small (less than 10 cm long), slender fish that live on the bottom in flowing fresh waters and feed on small animals such as insects.

Species
There are currently 81 recognized species in this genus:


 * Characidium alipioi Travassos, 1955
 * Characidium amaila Lujan, Agudelo-Zamora, Taphorn, Booth & López-Fernández, 2013
 * Characidium bahiense V. G. Almeida, 1971
 * Characidium barbosai Flausino Junior, Lima, Machado & Melo, 2020
 * Characidium bimaculatum Fowler, 1941
 * Characidium boavistae Steindachner, 1915
 * Characidium boehlkei Géry, 1972
 * Characidium bolivianum N. E. Pearson, 1924
 * Characidium borellii Boulenger, 1895
 * Characidium brevirostre Pellegrin, 1909
 * Characidium cacah Zanata, Ribeiro, Araújo-Porto, Pessali & Oliveira-Silva, 2020
 * Characidium caucanum C. H. Eigenmann, 1912
 * Characidium chancoense Agudelo-Zamora, Ortega-Lara & Taphorn, 2020
 * Characidium chicoi da Graça, Ota & Domingues, 2019
 * Characidium chupa L. P. Schultz, 1944
 * Characidium clistenesi M. R. S. de Melo & Espíndola, 2016
 * Characidium crandellii Steindachner, 1915
 * Characidium cricarense Malanski, Sarmento-Soares, Silva-Malanski, Lopes, Ingenito & Buckup, 2019
 * Characidium declivirostre Steindachner, 1915
 * Characidium deludens Zanata & Camelier, 2015
 * Characidium dule Agudelo-Zamora, Tavera, Murillo & Ortega-Lara, 2020
 * Characidium duplicatum Armbruster, Lujan & Bloom, 2021
 * Characidium etheostoma Cope, 1872
 * Characidium etzeli Zarske & Géry, 2001
 * Characidium fasciatum J. T. Reinhardt, 1867
 * Characidium gomesi Travassos, 1956
 * Characidium grajahuense Travassos, 1944
 * Characidium hasemani Steindachner, 1915
 * Characidium heinianum Zarske & Géry, 2001
 * Characidium heirmostigmata da Graça & Pavanelli, 2008
 * Characidium helmeri Zanata, Sarmento-Soares & Martins-Pinheiro, 2015
 * Characidium iaquira Zanata, Ohara, Oyakawa & Dagosta, 2020
 * Characidium interruptum Pellegrin, 1909
 * Characidium japuhybense Travassos, 1949
 * Characidium kalunga Melo, Bouquerel, Masumoto, França & Netto-Ferreira, 2021
 * Characidium kamakan Zanata & Camelier, 2015
 * Characidium lagosantense Travassos, 1947
 * Characidium lanei Travassos, 1967
 * Characidium laterale (Boulenger, 1895)
 * Characidium lauroi Travassos, 1949
 * Characidium litorale Leitão & Buckup, 2014
 * Characidium longum Taphorn, Montaña & Buckup, 2006
 * Characidium macrolepidotum (W. K. H. Peters, 1868)
 * Characidium marshi Breder, 1925
 * Characidium mirim Netto-Ferreira, Birindelli & Buckup, 2013
 * Characidium nambiquara Zanata & Ohara, 2020
 * Characidium nana Mendonça & Netto-Ferreira, 2015
 * Characidium nupelia da Graça, Pavanelli & Buckup, 2008
 * Characidium occidentale Buckup & R. E. dos Reis, 1997
 * Characidium oiticicai Travassos, 1967
 * Characidium onca M. R. S. de Melo, Mauro César Lambert de Brito Ribeiro & F. C. T. Lima, 2021
 * Characidium orientale Buckup & R. E. dos Reis, 1997
 * Characidium papachibe L. A. W. Peixoto & Wosiacki, 2013
 * Characidium pellucidum C. H. Eigenmann, 1909
 * Characidium phoxocephalum C. H. Eigenmann, 1912
 * Characidium pteroides C. H. Eigenmann, 1909
 * Characidium pterostictum A. L. Gomes, 1947
 * Characidium pumarinri Teixeira & Melo, 2020
 * Characidium purpuratum Steindachner, 1882
 * Characidium rachovii Regan, 1913
 * Characidium roesseli Géry, 1965
 * Characidium samurai Zanata & Camelier, 2014
 * Characidium sanctjohanni Dahl, 1960
 * Characidium satoi M. R. S. de Melo & Oyakawa, 2015
 * Characidium schindleri Zarske & Géry, 2001
 * Characidium schubarti Travassos, 1955
 * Characidium serrano Buckup & R. E. dos Reis, 1997
 * Characidium steindachneri Cope, 1878
 * Characidium stigmosum M. R. S. de Melo & Buckup, 2002
 * Characidium summum Zanata & Ohara, 2015
 * Characidium tapuia Zanata, Ramos & Oliveira-Silva, 2018
 * Characidium tatama Agudelo-Zamora, Tavera, Murillo & Ortega-Lara, 2020
 * Characidium tenue (Cope, 1894)
 * Characidium timbuiense Travassos, 1946
 * Characidium travassosi M. R. S. de Melo, Buckup & Oyakawa, 2016
 * Characidium vestigipinne Buckup & L. Hahn, 2000
 * Characidium vidali Travassos, 1967
 * Characidium wangyapoik Armbruster, Lujan & Bloom, 2021
 * Characidium xanthopterum Silveira, Langeani, da Graça, Pavanelli & Buckup, 2008
 * Characidium xavante da Graça, Pavanelli & Buckup, 2008
 * Characidium zebra C. H. Eigenmann, 1909