Hyphessobrycon
Hyphessobrycon is a genus of freshwater ray-finned fish belonging to the family Acestrorhamphidae, the American characins. These species are among the fishes known as tetras. The genus is distributed in the Neotropical realm from southern Mexico to Río de la Plata in Argentina. Many of these species are native to South America; about six species are from Central America, and a single species, H. compressus, is from southern Mexico.
All small fishes, the Hyphessobrycon tetras reach maximum overall lengths of about. Great anatomical diversity exists in this genus. They are generally of typical characin shape, but vary greatly in coloration and body form, many species having distinctive black, red, or yellow markings on their bodies and fins. These species are generally omnivorous, feeding predominantly on small crustaceans, insects, annelid worms, and zooplankton. When spawning, they scatter their eggs and guard neither eggs nor young.
Taxonomy
Hyphessobrycon was first proposed as a monospecific genus in 1908 by the American entomologist and ichthyologist Durbin Ellis|Marion Durbin], with its type species designated as Hemigrammus compressus, a species described in 1904 by Seth Eugene Meek, with its type locality given as the Río Papaloapam basin at El Hule, Oaxaca, Mexico. The genus Hyphessobrycon is the type genus of the subfamily Hyphessobryconinae, within the American characin family Acestrorhamphidae. This family is classified within the suborder Characoidei of the order Characiformes.
This large genus of characins includes nearly 150 species. The systematics of Hyphessobrycon are still largely unresolved. Six groups within this genus have been recognized based on color patterns alone. With no phylogenetic analysis of this genus, species are placed into this genus as anatomically defined by Carl H. Eigenmann in 1917. 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. 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.
This genus, as traditionally defined, was not monophyletic. 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 and anal fins of males. In 2024, this clade was split from Hyphessobrycon as the revived genus Megalamphodus, and was found to belong to a different tetra subfamily. Recognition of monophyletic groups among Hyphessobrycon species is complicated by the difficulty in finding characters useful for hypothesis of relationships among the species. Traditional characters used to identify Hyphessobrycon are phylogenetically unreliable.
Etymology
The generic name, Hyphessobrycon, is of slightly uncertain origin. The second part derives from the Greek βρύκω ; the first derives from an ostensible Greek hyphesson, which may be an error for υπελάσσων.
Relationship to humans
Most of the species in the genus have not been rated by the IUCN Red List as Threatened, but many species have small distributions and at least three, H. flammeus, H. coelestinus and H. duragenys, are classified as endangered. One, H. taurocephalus, is categorised as possibly extinct. This species only occurs in a few rivers and streams in Santa Catarina and Paraná states of Brazil.
Many Hyphessobrycon species are popular aquarium fish, and some, including H. flammeus, are bred in large numbers in captivity.
Species
Hyphessobrycon contains the following valid species:Hyphessobrycon acaciae García-Alzate, Román-Valencia & Prada-Pedreros, 2010Hyphessobrycon agulha Fowler, 1913 Hyphessobrycon albolineatum Fernández-Yépez, 1950Hyphessobrycon amandae Géry & Uj, 1987 Hyphessobrycon amapaensis Zarske & Géry, 1998 Hyphessobrycon amaronensis García-Alzate, Román-Valencia & Taphorn Baechle|Taphorn], 2010Hyphessobrycon arianae Uj & Géry, 1989Hyphessobrycon atencioi Ardila Rodríguez, 2022Hyphessobrycon auca Almirón, Casciotta, Bechara & Ruíz Díaz, 2004Hyphessobrycon axelrodi Hyphessobrycon barranquilla Ardila Rodríguez, 2022Hyphessobrycon bayleyi F. C. T. Lima, Bastos, Rapp Py-Daniel & Ota, 2022Hyphessobrycon bifasciatus Ellis, 1911 Hyphessobrycon borealis Zarske, Le Bail & Géry, 2006Hyphessobrycon boulengeri Hyphessobrycon brumado Zanata & Camelier, 2010Hyphessobrycon bussingi Ota, F. R. Carvalho & Pavanelli, 2020Hyphessobrycon cachimbensis Travassos, 1964Hyphessobrycon cantoi Faria, K. L. A. Guimarães, Rodrigues, Oliveira (ichthyologist)|Oliveira] & F. C. T. Lima, 2021Hyphessobrycon caru E. C. Guimarães, Brito, Feitosa, Carvalho-Costa & Ottoni, 2019Hyphessobrycon catableptus Hyphessobrycon chiribiquete García‐Alzate, Lima, Taphorn, Mojica, Urbano‐Bonilla & Teixeira, 2020Hyphessobrycon citrus Marinho & Dagosta, 2024Hyphessobrycon clavatus Zarske, 2015Hyphessobrycon coelestinus Myers, 1929Hyphessobrycon columbianus Zarske & Géry, 2002Hyphessobrycon comodoro Dagosta, Seren, Ferreira & Marinho, 2022Hyphessobrycon compressus Hyphessobrycon condotensis Regan, 1913Hyphessobrycon corozalensis Ardila Rodríguez, 2022Hyphessobrycon cyanotaenia Zarske & Géry, 2006 Hyphessobrycon daguae C. H. Eigenmann, 1922Hyphessobrycon delimai Teixeira, Netto-Ferreira, Birindelli & Sousa, 2016Hyphessobrycon diancistrus S. H. Weitzman, 1977Hyphessobrycon dorsalis Zarske, 2014Hyphessobrycon duragenys Ellis, 1911Hyphessobrycon ecuadorensis Hyphessobrycon ecuadoriensis C. H. Eigenmann & Henn, 1914Hyphessobrycon eilyos F. C. T. Lima & Moreira, 2003 Hyphessobrycon elachys M. J. Weitzman, 1985Hyphessobrycon eos Durbin, 1909 Hyphessobrycon ericae Moreira & Lima, 2017Hyphessobrycon eschwartzae García-Alzate, Román-Valencia & Ortega, 2013Hyphessobrycon flammeus Myers, 1924 Hyphessobrycon frankei Zarske & Géry, 1997Hyphessobrycon frickei E. C. Guimarães, Brito, Bragança, Katz & Ottoni, 2020Hyphessobrycon georgettae Géry, 1961Hyphessobrycon geryi E. C. Guimarães, Brito, Bragança, Katz & Ottoni, 2020Hyphessobrycon gracilior Géry, 1964Hyphessobrycon griemi Hoedeman, 1957 Hyphessobrycon hasemani Fowler, 1913Hyphessobrycon heliacus Moreira, Landim & Costa, 2002Hyphessobrycon herbertaxelrodi Géry, 1961 Hyphessobrycon heteresthes Hyphessobrycon heterorhabdus Hyphessobrycon hexastichos Bertaco & T. P. Carvalho, 2005 Hyphessobrycon hildae Fernández-Yépez, 1950Hyphessobrycon igneus Miquelarena, Menni, López & Casciotta, 1980Hyphessobrycon inconstans Hyphessobrycon isiri Almirón, Casciotta & Körber, 2006Hyphessobrycon itaparicensis S. M. Q. Lima & W. J. E. M. Costa, 2001Hyphessobrycon jackrobertsi Zarske, 2014Hyphessobrycon juruna Faria, F. C. T. Lima & Bastos, 2018Hyphessobrycon kayabi Teixeira, F. C. T. Lima & Zuanon, 2014Hyphessobrycon klausanni García-Alzate, Urbano-Bonilla & Taphorn, 2017Hyphessobrycon krenakore Teixeira, Netto-Ferreira, Birindelli & Sousa, 2016Hyphessobrycon loretoensis Ladiges, 1938 Hyphessobrycon loweae W. J. E. M. Costa & Géry, 1994Hyphessobrycon lucenorum Ohara & F. C. T. Lima, 2015Hyphessobrycon maculicauda Ahl, 1936 Hyphessobrycon mamuruensis Faria, Oliveira, Monteiro & F. C. T. Lima 2025Hyphessobrycon mapinguari Pastana, Dutra, Ohara, Teixeira & Menezes, 2025Hyphessobrycon margitae Zarske, 2016Hyphessobrycon mavro García-Alzate, Román-Valencia & Prada-Pedreros, 2010Hyphessobrycon melanostichos T. P. Carvalho & Bertaco, 2006 Hyphessobrycon melasemeion Fowler, 1945 Hyphessobrycon melazonatus Durbin, 1908Hyphessobrycon meridionalis Ringuelet, Miquelarena & Menni, 1978Hyphessobrycon metae C. H. Eigenmann & Henn, 1914Hyphessobrycon minimus Durbin, 1909Hyphessobrycon minor Durbin, 1909Hyphessobrycon moniliger Moreira, F. C. T. Lima & W. J. E. M. Costa, 2002Hyphessobrycon montagi F. C. T. Lima, Coutinho & Wosiacki, 2014Hyphessobrycon mutabilis W. J. E. M. Costa & Géry, 1994Hyphessobrycon myrmex Pastana, D'Agosta & Esguícero, 2017Hyphessobrycon natagaima García-Alzate, Taphorn, Román-Valencia & Villa-Navarro, 2015Hyphessobrycon nicolasi Miquelarena & López, 2010Hyphessobrycon niger García-Alzate, Román-Valencia & Prada-Pedreros, 2010Hyphessobrycon nigricinctus Zarske & Géry, 2004 Hyphessobrycon notidanos T. P. Carvalho & Bertaco, 2006 Hyphessobrycon ocasoensis García-Alzate & Román-Valencia, 2008Hyphessobrycon ocoae Hyphessobrycon olayai Ardila Rodríguez, 2022Hyphessobrycon oritoensis García-Alzate, Román-Valencia & Taphorn, 2008 Hyphessobrycon otrynus Benine & Lopes, 2008Hyphessobrycon paepkei Zarske, 2014Hyphessobrycon panamensis Durbin, 1908Hyphessobrycon pando Hein, 2009 Hyphessobrycon parvellus Ellis, 1911Hyphessobrycon paucilepis García-Alzate, Román-Valencia & Taphorn, 2008Hyphessobrycon peruvianus Ladiges, 1938 Hyphessobrycon petricolus Ohara, Lima & Barros, 2017Hyphessobrycon peugeoti Ingenito, Lima & Buckup, 2013Hyphessobrycon piabinhas Fowler, 1941Hyphessobrycon pinnistriatus F. R. Carvalho, Cabeceira & L. N. Carvalho, 2017Hyphessobrycon piorskii E. C. Guimarães, Brito, Feitosa, Carvalho-Costa & Ottoni, 2018Hyphessobrycon piranga Camelier, Dagosta & Marinho, 2018Hyphessobrycon platyodus Ohara, Abrahão & Espíndola, 2017Hyphessobrycon poecilioides C. H. Eigenmann, 1913Hyphessobrycon procerus Mahnert & Géry, 1987Hyphessobrycon procyon Pastana & Ohara, 2016Hyphessobrycon psittacus Dagosta, Marinho, Camelier & F. C. T. Lima, 2016Hyphessobrycon pulchripinnis Ahl, 1937 Hyphessobrycon pyrrhonotus Burgess, 1993Hyphessobrycon pytai Géry & Mahnert, 1993Hyphessobrycon quibdoensis Ardila Rodríguez, 2022Hyphessobrycon reticulatus Ellis, 1911Hyphessobrycon reyae Ardila Rodríguez, 2022Hyphessobrycon rheophilus Ohara, Teixeira, Albornoz-Garzón, Mirande & F. C. T. Lima, 2019Hyphessobrycon ribeiroi Lima, Silva-Oliveira, Oliveira & Faria, 2025Hyphessobrycon robustulus Hyphessobrycon roseus Hyphessobrycon rutiliflavidus Carvalho, Langeani, Miyazawa & Troy, 2008 Hyphessobrycon saizi Géry, 1964Hyphessobrycon santae Hyphessobrycon sateremawe Faria, Bastos, Zuanon & F. C. T. Lima, 2020Hyphessobrycon savagei Bussing, 1967Hyphessobrycon schauenseei Fowler, 1926Hyphessobrycon scholzei Ahl, 1937 Hyphessobrycon scutulatus Lucena, 2003 Hyphessobrycon simulatus Hyphessobrycon sovichthys Schultz, 1944Hyphessobrycon stegemanni Géry, 1961 Hyphessobrycon stramineus Durbin, 1918 Hyphessobrycon taguae García-Alzate, Román-Valencia & Taphorn, 2010Hyphessobrycon takasei Géry, 1964 Hyphessobrycon taphorni García-Alzate, Román-Valencia & Ortega, 2013Hyphessobrycon taurocephalus Ellis, 1911Hyphessobrycon tenuis Géry, 1964Hyphessobrycon tortuguerae Böhlke, 1958Hyphessobrycon troemneri Hyphessobrycon tropis Géry, 1963Hyphessobrycon tukunai Géry, 1965Hyphessobrycon tuyensis García-Alzate, Román-Valencia & Taphorn, 2008Hyphessobrycon vanzolinii F. C. T. Lima & Flausino, 2016Hyphessobrycon veredus Teixeira, Dutra, Penido, Santos & Pessali, 2019Hyphessobrycon vilmae Géry, 1966Hyphessobrycon vinaceus Bertaco, Malabarba & Dergam, 2007Hyphessobrycon wadai Marinho, D'Agosta, Camelier & Oyakawa, 2016 Hyphessobrycon wajat Almirón & Casciotta, 1999Hyphessobrycon weitzmanorum F. C. T. Lima & Moreira, 2003Hyphessobrycon werneri Géry & Uj, 1987Hyphessobrycon wosiackii Moreira & F. C. T. Lima, 2017Hyphessobrycon zoe Faria, Lima & Wosiacki, 2020