Metynnis

{{Short description|Genus of fishes}} {{Automatic taxobox | image = Metynnis hypsauchen small.jpg | image_caption = ''Metynnis hypsauchen'' | taxon = Metynnis | authority = Cope, 1878 | type_species = ''Metynnis luna'' | type_species_authority = Cope, 1878 | synonyms = {{Genus list | Myleocollops | Eigenmann, 1903 | Sealeina | Fowler, 1907 }} | synonyms_ref = <ref name = "Cof family">{{Cof family|family=Serrasalminae|access-date=19 July 2025}}</ref> }}

'''''Metynnis''''' also commonly known as the silver dollar is a genus of freshwater ray-finned fishes belonging to the family Serrasalmidae, which includes the pacus, piranhas and related fishes. The fishes in this genus are found in tropical and subtropical South America.<ref name=fishbase>{{FishBase genus | genus = Metynnis| month = May | year = 2017}}</ref> They are herbivorous or omnivorous, and inhabit a wide range of freshwater habitats, ranging from rivers and streams (both fast- and slow-flowing), to floodplains, flooded forests, lakes, pools and reservoirs.<ref name=Sleen2017>{{cite book |editor=van der Sleen, P. |editor2=J.S. Albert | year=2017 | title=Field Guide to the Fishes of the Amazon, Orinoco, and Guianas | publisher=Princeton University Press | page=183-184 | isbn=978-0691170749 }}</ref> They generally reach {{convert|8-15|cm|in|abbr=on|0}} in standard length,<ref name=Sleen2017/> although a few species may reach up to {{convert|18|cm|in|abbr=on|0}}.<ref name=fishbase/> The genus contains many of the species known as silver dollars in the aquarium trade.

Though part of the subfamily Serrasalminae, members of this genus are not commonly called piranhas, due to their largely herbivorous diets.<ref name=":0">{{Cite journal |last=Kolmann |first=M A |last2=Hughes |first2=L C |last3=Hernandez |first3=L P |last4=Arcila |first4=D |last5=Betancur-R |first5=R |last6=Sabaj |first6=M H |last7=López-Fernández |first7=H |last8=Ortí |first8=G |date=2021-05-01 |title=Phylogenomics of Piranhas and Pacus (Serrasalmidae) Uncovers How Dietary Convergence and Parallelism Obfuscate Traditional Morphological Taxonomy |url=https://academic.oup.com/sysbio/article/70/3/576/5891674 |journal=Systematic Biology |volume=70 |issue=3 |pages=576–592 |doi=10.1093/sysbio/syaa065 |issn=1063-5157}}</ref>

==Species== These are the currently recognized species in this genus:<ref name="Cof genus">{{Cof genus|genus=Metynnis|access-date=19 July 2025}}</ref>

{{Linked species list | Metynnis altidorsalis | Ahl 1924 | Metynnis anisurus | Ahl, 1924 | Metynnis argenteus | Ahl, 1924 | Metynnis cuiaba | Pavanelli, Ota & Petry, 2009 | Metynnis fasciatus | Ahl, 1931 | Metynnis guaporensis | Eigenmann, 1915 | Metynnis hypsauchen | (Müller & Troschel, 1844) | Metynnis lippincottianus | (Cope, 1870) | Metynnis longipinnis | Zarske & Géry, 2008 | Metynnis luna | Cope, 1878 | Metynnis maculatus | (Kner, 1858) | Metynnis melanogrammus | Ota, Rapp Py-Daniel & Jégu, 2016 | Metynnis mola | Eigenmann & Kennedy, 1903 | Metynnis orinocensis | (Steindachner, 1908) | Metynnis otuquensis | Ahl, 1924 | Metynnis polystictus | Zarske & Géry, 2008 }}

==References== {{Reflist}}

Category:Fish of South America Category:Actinopterygii genera Category:Serrasalminae Category:Metynnis Category:Taxa named by Edward Drinker Cope