the Rio Negro and Orinoco basins. These species all live in rapidly moving water with a rocky environment. A dense occurrence of Tometes larvae and juveniles in rapids around Podostemaceae plants, the main food source of adult Tometes, suggests that there is a positive rheotrophism (adaptability to fast-flowing water) in the larval stage. Unlike the strictly phytophagous adults, juveniles also feed on invertebrates. Their association with Podostemaceae plants restricts their distributions, which makes them vulnerable to the loss of rapids by the introduction of hydroelectric dams. In a cultural aspect rheophilic serrasalmids (notably Tometes, Myloplus and Mylesinus) are important in the tradition of local communities. Species There are currently 7 recognized species in this genus: Tometes ancylorhynchus M. C. Andrade, Jégu & Giarizzo, 2016 Tometes camunani M. C. Andrade, Giarizzo & Jégu, 2013 Tometes kranponhah M. C. Andrade, Jégu & Giarizzo, 2016 Tometes lebaili Jégu, Keith & Belmont-Jégu, 2002 Tometes makue Jégu, G. M. Santos & Belmont-Jégu, 2002 Tometes siderocarajensis Andrade et al., 2017 Tometes trilobatus Valenciennes, 1850 References Serrasalmidae Fish of South America