Editing Hyphessobrycon (section)

==Taxonomy==
This large genus of characins includes over 150 species.<ref name=FB/> The systematics of ''Hyphessobrycon'' are still largely unresolved.<ref name=Lima2003>{{cite journal|author=Lima, F.C.T. |author2= Moreira, C.R. |year=2003|url=http://www.scielo.br/pdf/ni/v1n1/v1n1a03.pdf |title=Three new species of ''Hyphessobrycon'' (Characiformes: Characidae) from the upper rio Araguaia basin in Brazil|journal=Neotropical Ichthyology|volume= 1 |issue=1|pages= 21–33|doi= 10.1590/S1679-62252003000100003 }}</ref> Six groups within this genus have been recognized based on color patterns alone.<ref name=Bertaco2005>{{cite journal|author=Bertaco, V.A. |author2= Malabarba, L.R. |year=2005 |url=http://www.scielo.br/pdf/ni/v3n1/v3n1a04.pdf |title=A new species of ''Hyphessobrycon'' (Teleostei: Characidae) from the upper Rio Tocantins drainage, with bony hooks on fins|journal=Neotropical Ichthyology |volume=3 |issue=1|pages= 83–88|doi= 10.1590/S1679-62252005000100004 }}</ref> With no [[phylogeny|phylogenetic]] analysis of this genus, species are placed into this genus as anatomically defined by [[Carl H. Eigenmann]] in 1917.<ref name=Lucena2003/> By this definition, ''Hyphessobrycon'' is identified by the presence of an [[adipose fin]], incomplete [[lateral line]], two tooth series in the [[premaxilla]], with the teeth of the external series continuous in a single series, teeth not strictly conical, preventral scales arranged in more than one row and lack of scales in the [[caudal fin]].<ref name=Lucena2003/> The characteristic of extension of scales onto the caudal fin that differentiates this genus from ''[[Hemigrammus]]'' is not satisfactory, as it occurs in intermediate conditions.<ref name=Lucena2003/>

This genus, as traditionally defined, was not [[monophyly|monophyletic]].<ref name=Lucena2003/> A monophyletic group within ''Hyphessobrycon'' has been hypothesized, termed the rosy tetra [[clade]]; this group is based upon coloration pattern and the shape of [[dorsal fin|dorsal]] and [[anal fin]]s of males.<ref name=Bertaco2005/> In 2024, this clade was split from ''Hyphessobrycon'' as the revived genus ''[[Megalamphodus]]'', and was found to belong to a different tetra subfamily.<ref>{{Cite journal |last=Melo |first=Bruno F |last2=Ota |first2=Rafaela P |last3=Benine |first3=Ricardo C |last4=Carvalho |first4=Fernando R |last5=Lima |first5=Flavio C T |last6=Mattox |first6=George M T |last7=Souza |first7=Camila S |last8=Faria |first8=Tiago C |last9=Reia |first9=Lais |last10=Roxo |first10=Fabio F |last11=Valdez-Moreno |first11=Martha |last12=Near |first12=Thomas J |last13=Oliveira |first13=Claudio |date=2024-09-01 |title=Phylogenomics of Characidae, a hyper-diverse Neotropical freshwater fish lineage, with a phylogenetic classification including four families (Teleostei: Characiformes) |url=https://academic.oup.com/zoolinnean/article-abstract/202/1/zlae101/7748269 |journal=Zoological Journal of the Linnean Society |volume=202 |issue=1 |pages=zlae101 |doi=10.1093/zoolinnean/zlae101 |issn=0024-4082|url-access=subscription }}</ref> Recognition of monophyletic groups among ''Hyphessobrycon'' species is complicated by the difficulty in finding characters useful for hypothesis of relationships among the species.<ref name=Bertaco2005/> Traditional characters used to identify ''Hyphessobrycon'' are phylogenetically unreliable.<ref name=Bertaco2005/>