The Percopsiformes are a small order of
ray-finned fishes, comprising the
trout-perch
''Percopsis omiscomaycus'', also known as the trout-perch, the grounder or the sand minnow, is one of two species in the family Percopsidae. Its name comes from the Greek root words ''perc'', meaning perch and ''opsi'' meaning appearance. The sp ...
and its allies. It contains just ten
extant
Extant is the opposite of the word extinct. It may refer to:
* Extant hereditary titles
* Extant literature, surviving literature, such as ''Beowulf'', the oldest extant manuscript written in English
* Extant taxon, a taxon which is not extinct, ...
species, grouped into seven
genera
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ...
and three
families. Five of these genera are
monotypic
They are generally small fish, ranging from in adult body length. They inhabit freshwater habitats in North America. They are grouped together because of technical characteristics of their internal anatomy, and the different species may appear quite different externally.
* Order Percopsiformes
Berg 1937
** Genus †''
Lateopisciculus''
Murray & Wilson1996
** Genus †''
Percopsiformorum''
tolith** Suborder Percopsoidei
Berg 1937
*** Family †
Libotoniidae
''Libotonius'' is an extinct genus of prehistoric percopsiform in the monotypic family Libotoniidae which lived during the middle division of the Eocene epoch. The type species ''Libotonius blakeburnensis'' is named for Blakeburn, British Colu ...
Wilson & Williams 1992
**** Genus †''
Libotonius
''Libotonius'' is an extinct genus of prehistoric percopsiform in the monotypic family Libotoniidae which lived during the middle division of the Eocene epoch. The type species ''Libotonius blakeburnensis'' is named for Blakeburn, British Colu ...
''
Wilson 1977
*** Family
Percopsidae
Percopsidae is a family of fish in the order Percopsiformes, with one extant genus with two species, both endemic to North America, and two known fossil genera.
They are small fish with weak fin spines, and an adipose fin similar to those of ...
Regan 1911 ercopsides Agassiz 1850; Erismatopteridae Jordan 1905**** Genus †''
Massamorichthys''
Murray 1996
**** Genus †''
Amphiplaga''
Cope 1877
**** Genus †''
Erismatopterus''
Cope 1870
**** Genus ''
Percopsis
''Percopsis'' is a small genus of percopsiform fishes native to North America, with these two recognized species:
* ''Percopsis omiscomaycus'' (Walbaum, 1792) (trout-perch)
* ''Percopsis transmontana
''Percopsis transmontana'', the sand roller ...
''
Agassiz 1849 Columbia
Columbia may refer to:
* Columbia (personification), the historical female national personification of the United States, and a poetic name for America
Places North America Natural features
* Columbia Plateau, a geologic and geographic region in ...
''
Eigenmann & Eigenmann 1892 non Rang 1834; ''Columatilla''
Whitley 1940; ''Salmoperca''
Thompson 1850]
** Suborder Aphredoderoidei
Berg 1937 [Amblyopsoidei
Regan 1911; Aphredoderoidea; Amblyopsoidea]
*** Family
Aphredoderidae Bonaparte 1832 (Pirate perches)
**** Genus †''
Trichophanes''
Cope 1872
**** Genus ''
Aphredoderus''
Lesueur 1833 ex Cuvier & Valenciennes 1833 'Sternotremia''
Nelson 1876; ''Asternotremia">Sternotremia.html" ;"title="'Sternotremia">'Sternotremia''
Nelson 1876; ''Asternotremia''
Nelson ex Jordan 1877; ''Scolopsis''
Gilliams 1824 non Cuvier 1814]
*** Family Amblyopsidae
Bonaparte 1832 [Hypsaeidae
Storer 1846] (Cavefishes)
**** Genus ''Typhlichthys''
Girard 1859 (Southern cavefish)
**** Genus ''
Speoplatyrhinus''
Cooper & Kuehne 1974 (Alabama cavefish)
**** Genus ''
Forbesichthys''
Jordan 1929 'Forbesella''
Jordan & Evermann 1927 non Herdman 1891 non Lacaze-Duthiers & Delage 1892">Forbesella.html" ;"title="'Forbesella">'Forbesella''
Jordan & Evermann 1927 non Herdman 1891 non Lacaze-Duthiers & Delage 1892(Spring cavefish)
**** Genus ''Chologaster''
Agassiz 1853 (Swampfish)
**** Genus ''Amblyopsis''
de Kay 1842 [''Troglichthys''
Eigenmann 1899; ''Poecilosomus''
Swainson 1839]
References
{{Taxonbar, from=Q3899690
Percopsiformes,
Taxa named by Lev Berg
Extant Campanian first appearances
Ray-finned fish orders