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Encyclopedia > Actinopterygii
Ray-finned fish
Photo by Uwe Kils. Image:Herringuwe.jpg edited to have a white background. File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. Click on date to download the file or see the image uploaded on that date. (del) (cur... image:Herring2.jpg
Atlantic herring Clupea harengus is the most abundant fish species of the world, living in large schools (swarm). Growing up to 45 centimeters in length and more than half a kilogram in weight, they feed on copepods, krill and small fish and are food for seals, whales, cod and other... Atlantic herring
Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. Modern classification has its roots in the system of Carolus Linnaeus, who grouped species according to shared physical characteristics. These groupings have been revised since Linnaeus to improve consistency with the Darwinian... Scientific classification
Kingdom: Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Bilateria Acoelomorpha Orthonectida Rhombozoa ? Myxozoa Superphylum Deuterostomia     Chordata (vertebrates, etc.)     Hemichordata (acorn worms)     Echinodermata    ? Chaetognatha (arrow worms) Superphylum Ecdysozoa     Kinorhyncha     Loricifera    ... Animalia
Phylum: Typical Classes Subphylum Urochordata - Tunicates Ascidiacea Thaliacea Larvacea Subphylum Cephalochordata - Lancelets Subphylum Myxini - Hagfishes Subphylum Vertebrata - Vertebrates Petromyzontida - Lampreys Placodermi (extinct) Chondrichthyes - Cartilaginous fishes Acanthodii (extinct) Actinopterygii - Ray-finned fishes Actinistia - Coelacanths Dipnoi - Lungfishes Amphibia - Amphibians Reptilia - Reptiles Aves - Birds Mammalia - Mammals Chordates (phylum Chordata) include the vertebrates, together with... Chordata
Class: Actinopterygii
Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. Modern classification has its roots in the system of Carolus Linnaeus, who grouped species according to shared physical characteristics. These groupings have been revised since Linnaeus to improve consistency with the Darwinian... Orders

See text

The Actinopterygii are the ray-finned Fish might refer to: Fish - vertebrates with gills which live in water Fish (sometimes FISH) - the British code-word for World War II German stream cipher teleprinter secure communications devices The FISH (FIbonacci SHrinking) stream cipher published in 1993 Fish - the former lead singer of progressive rock band Marillion fluorescent... fish. They are the dominant group of Typical classes Petromyzontidae (lampreys) Placodermi - extinct Chondrichthyes (cartilaginous fish) Acanthodii - extinct Actinopterygii (ray-finned fish) Actinistia (coelacanths) Dipnoi (lungfish) Amphibia (amphibians) Reptilia (reptiles) Aves (birds) Mammalia (mammals) Vertebrata is a subphylum of chordates, specifically, those with backbones or spinal columns. The bones of the spinal column (or vertebral column) are... vertebrates, with over 27,000 species ubiquitous throughout For the village on the Isle of Wight, see Freshwater, Isle of Wight. Fresh water (also freshwater or fresh-water) is water that contains only minimal quantities of dissolved salts, especially sodium chloride, thus distinguishing it from sea water or brackish water. All freshwater ultimately comes from precipitation of atmospheric... fresh water and Ocean (Okeanos, a Greek god of sea and water; Greek ωκεανός) covers almost three quarters (71%) of the surface of the Earth. This global, interconnected body of salt water is divided by the continents and Atlantic Ocean Indian Ocean Pacific Ocean Southern Ocean —... marine environments. They are traditionally treated as a subclass of the Subclasses Actinopterygii Sarcopterygii Osteichthyes are the bony fish, a group paraphyletic to the land vertebrates, which are sometimes included. Most belong to the Actinopterygii. The others are called lobe-finned fish, and include lungfish and coelacanths. They are traditionally treated as a class of vertebrates, with subclasses Actinopterygii and Sarcopterygii... Osteichthyes, or bony fish, but as that group is In phylogenetics, a grouping of organisms is said to be paraphyletic (Greek para = near and phyle = race) if all the members of the group have a common ancestor, but the group does not include all the descendants of the most recent common ancestor of all group members. Groups which include... paraphyletic they may be treated as a full Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. Modern classification has its roots in the system of Carolus Linnaeus, who grouped species according to shared physical characteristics. These groupings have been revised since Linnaeus to improve consistency with the Darwinian... class.

Traditionally three grades of Actinopterygii have been recognized: the Chondrostei, Holostei, and Teleostei. The second is paraphyletic and tends to be abandoned, however, while the first is now restricted to those forms closer to extant Chondrostei than to the other groups. Nearly all fish alive today are Orders See text The Actinopterygii are the ray-finned fish. They are the dominant group of vertebrates, with over 27,000 species ubiquitous throughout fresh water and marine environments. They are traditionally treated as a subclass of the Osteichthyes, or bony fish, but as that group is paraphyletic they may... teleosts. A listing of the different groups is given below, down to the level of orders, arranged in what is believed to represent the evolutionary sequence down to the level of superorder.


  • Chondrostei
    • Order Genera Erpetoichthys Polypterus The bichirs are a family (Polypteridae) of primitive ray-finned fishes, the sole family in the order Polypteriformes. They have thick bonelike scales and a series of dorsal finlets instead of a single fin. All 16 recognized species occur in freshwater habitats in Africa. They are popular... Polypteriformes (bichirs)
    • Order Families Acipenseridae (sturgeons) Polyodontidae (paddlefishes) Chondrosteidae extinct Errolichthyidae extinct Acipenseriformes is an order of primitive ray-finned fishes that includes the sturgeons and paddlefishes, as well as some extinct families. Acipenseriform skeletons are largely cartilage. References Martin Hochleithner and Joern Gessner, The Sturgeons and Paddlefishes of the World: Biology and... Acipenseriformes (sturgeons, paddlefish)
  • Order Species Atractosteus spatula Atractosteus tristoechus Atractosteus tropicus Lepisosteus oculatus Lepisosteus osseus Lepisosteus platostomus Lepisosteus platyrhincus The gars are an ancient order Lepisosteiformes (or Semionotiformes) of primitive ray-finned fish; fossil gars are known from the Permian onwards. The living members of the order are all in a single family Lepisosteidae... Semionotiformes (gars)
  • Order Binomial name Amia calva The bowfins are an order (Amiiformes) of primitive ray_finned fish. Only one species, the bowfin Amia calva, family Amiidae, exists today, although additional species in six families are known from Jurassic and Cretaceous fossils. The most distinctive characteristic of the bowfin is its very long dorsal... Amiiformes (bowfins)
  • Teleostei
    • Osteoglossomorpha
      • Order Families Heterotididae Pantopontidae (butterflyfishes) Singidididae (extinct) Osteoglossidae ( arowana) Ostariostomidae (extinct) Notopteridae (featherfin knifes) Gymnarchidae Mormyridae (elephantfishes) Osteoglossiformes (Lat. bony tongues) is a relatively primitve order of ray-finned fish. Members of the order are notable for having toothed or bony tongues, and for having the forward part of the gastrointestinal... Osteoglossiformes (bony tongues, etc)
      • Order Families Hiodontidae (mooneyes) Hiodontiformes is a relatively new order of fish, consisting of the two living species of the mooneye family Hiodontidae and three genera of extinct types. These are traditionally classified with the Osteoglossiformes, and many authorities still do, but fossil study of the extinct Yanbiania suggest that the... Hiodontiformes (mooneye, etc)
    • Elopomorpha
      • Order Families Elopidae (tenpounders) Megalopidae (tarpons) Elopiformes is the order of ray-finned fish that includes the tarpons, tenpounders, and ladyfish, as well as a number of extinct types. External link Mikkos Phylogeny for Elopiformes Categories: Ray-finned fish ... Elopiformes (tarpons, etc)
      • Order Genera Albula Pterothrissa The bonefishes are a family (Albulidae) of ray-finned fish that are popular as game fish in Florida and elsewhere. The family is small, with seven species in two genera. Presently the bonefishes are in their own order: Albuliformes. The spiny eels (Notacanthidae) and halosaurs (Halosauridae) may... Albuliformes (bonefishes)
      • Order Families Halosauridae Notacanthidae Notacanthiformes is an order of ray-finned fishes, consisting of the families of spiny eels (Notacanthidae) and halosaurs (Halosauridae). The order is of relatively recent vintage; Fishes of the World lists it as a suborder Notacanthoidei of Albuliformes. The notacanthiforms are much more eel-like than the... Notacanthiformes (spiny eels)
      • Order The Anguilliformes (true eels) are an order of bony fishes. Classification Order Anguilliformes (true eels, gulpers) Suborder Anguilloidei Family Anguillidae (freshwater eels including American eel, important for food) Family Heterenchelyidae Family Moringuidae (worm eels) Family Xenocongridae (false morays) Family Muraenidae (moray eels) Family Myrocongridae Suborder Nemichthyoidei Family Nemichthyidae (snipe eels... Anguilliformes (true eels, gulpers)
      • Order Families Cyematidae Saccopharyngidae Eupharyngidae Monognathidae Saccopharyngiformes is an order of unusual ray-finned fish superficially similar to eels, but with many internal differences. Most of the fish in this order are deep-sea types known from only a handful of specimens. Saccopharyngiforms lack several bones, such as the symplectic bone... Saccopharyngiformes
    • Clupeomorpha
      • Order Families Denticipitidae (denticle herring) Engraulidae (anchovies) Pristigasteridae (pristigasterids) Chirocentridae (wolf herring) Clupeidae (herrings) Clupeiformes is the order of ray-finned fish that includes the herring family, Clupeidae, and the anchovy family, Engraulidae. The order includes about 300 species in five families. Categories: Clupeiformes ... Clupeiformes (herrings & allies)
    • Ostariophysi
      • Order Families Chanidae (milkfish) Gonorynchidae (beaked salmons) Kneriidae (shellears) Phractolaemidae (hingemouths) Gonorynchiformes is an order of ray-finned fish that includes the important food source, the milkfish (Chanos chanos, family Chanidae), and a number of lesser-known types, both marine and freshwater. The alternate spelling Gonorhynchiformes, with an h, is frequently... Gonorynchiformes
      • Order Families Suborder Cobitoidea     Balitoridae (hillstream loaches)     Catostomidae (suckers)     Cobitidae (loaches)     Gyrinocheilidae (algae eaters) Suborder Cyprinoidea     Cyprinidae (carps and minnows) The Cypriniformes are an order of ray-finned fish, including the minnows and some related families... Cypriniformes (minnows & allies)
      • Order Families  Acestrorhynchidae  Anostomidae - Headstanders  Characidae - Characins and tetras  Citharinidae  Ctenoluciidae - Pike-characids  Curimatidae  Erythrinidae - Trahiras  Gasteropelecidae - Freshwater hatchetfishes  Hemiodontidae  Hepsetidae  Lebiasinidae The Characiformes are an order of ray-finned fish, comprising the characins and their allies. There are a... Characiformes (characins & allies)
      • Order Families Apteronotidae (ghost knifefishes) Eigenmanniidae (obsolete?) Gymnotidae (naked-back knifefishes and electric eels) Hypopomidae Rhamphichthyidae Sternopygidae The gymnotiforms are an order (Gymnotiformes) of knifefishes that have organs adapted to the exploitation of bioelectricity. The best-known member is the electric eel (Electrophorus electricus), which uses powerful electric shocks for both... Gymnotiformes (electric eels, knifefishes)
      • Order Families Akysidae Amblycipitidae Amphiliidae Ariidae Aspredinidae Astroblepidae Auchenipteridae Bagridae Callichthyidae Cetopsidae Chacidae Clariidae Claroteidae Cranoglanididae Diplomystidae Doradidae Hypophthalmidae Ictaluridae Loricariidae Malapteruridae Mochokidae Nematogenyidae Pangasiidae Parakysidae Pimelodidae Plotosidae Schilbeidae Scoloplacidae Siluridae Sisoridae Trichomycteridae Catfish (order Siluriformes) are a diverse group of fish. Notable for their prominent barbels, they are found in... Siluriformes (catfishes)
    • Protacanthopterygii
      • Order Genera (see text) Salmonidae is a family of ray-finned fish, the only family of order Salmoniformes. It includes the well-known salmons and trouts; the Atlantic salmons and trouts of genus Salmo give the family and order their names. Together with the closely-related Esociformes (the pikes and related... Salmoniformes (salmon & allies)
      • Order Families Esocidae (pikes) Umbridae (mudminnows) Esociformes is a small order of ray-finned fish, with two families. The pikes of genus Esox give the order its name. This order is closely related to the Salmoniformes, the two comprising the superorder Protacanthopterygii, and are often included in their order. The esociform... Esociformes (pikes & allies)
      • Order Families Suborder Argeninoidei   Superfamily Argentinoidea     Argentinidae (herring smelts)     Microstomatidae     Bathylagidae (deep-sea smelts)     Opisthoproctidae (barreleyes)   Superfamily Alepocephaloidea     Leptochilichthyidae     Alepocephalidae (slickheads)   ... Osmeriformes
    • Sternopterygii
      • Order Species Ateleopus indicus Ateleopus japonicus Ateleopus natalensis Ateleopus purpureus Ateleopus tanabensis Guentherus altivelis Ijimaia antillarum Ijimaia dofleini Ijimaia loppei Ijimaia plicatellus Parateleopus microstomus The jellynose fishes are a small order (Ateleopodiformes) of ray-finned fish, consisting of a single family (Ateleopodidae) with about a dozen species in four genera. Jellynoses... Ateleopodiformes (jellynose fishes)
      • Order Families Suborder Gonostomatoidei  Gonostomatidae - Bristlemouths  Sternoptychidae - Deep-sea hatchetfishes Suborder Photichthyoidei  Photichthyidae - Lightfishes  Stomiidae - Barbeled dragonfishes Stomiiformes is an order of ray-finned fish that includes the dragonfishes, lightfishes, hatchetfishes, viperfishes, and loosejaws. It includes four families with a total of about 320 species. Members of... Stomiiformes (dragonfishes & allies)
    • Cyclosquamata
      • Order Families Suborder Enchodontoidei   Dercetidae (extinct)   Cimolichthyidae (extinct)   Prionolepididae (extinct)   Enchodontidae (extinct)   Eurypholidae (extinct)   Halecidae (extinct)   Apateopholidae (extinct)   Ichthyotringidae (extinct) Suborder Giganturoidei   Giganturidae (telescopefishes) Suborder Aulopoidei   Aulopodidae (aulopus) Suborder Chlorophthalmoidei  ... Aulopiformes (lizardfishes)
    • Scopelomorpha
      • Order Families   Neoscopelidae   Myctophidae Myctophiformes is an order of ray-finned fish consisting of two families of deep-sea marine fish, most notably the lanternfishes (Myctophidae). The order is similar to Aulopiformes, but the pharyngobranchial structure is more standard. Reference J. S. Nelson, Fishes of the World... Myctophiformes (lanternfishes)
    • Lampridiomorpha
      • Order families Turkmenidae (extinct) Veliferidae (velifers) Lamprididae (opahs) Stylephoridae (tube-eye/thread-tail) Lophotidae (crestfishes) Radiicephalidae (tapertail) Trachipteridae (ribbonfishes) Regalecidae (oarfishes) Lampridiformes (also spelt Lampriformes) are an order of ray-finned fish that includes about 50 living species of deep sea fishes, including the opahs, crestfish, ribbonfishes, and oarfish. These are... Lampridiformes (opahs, etc)
    • Polymyxiomorpha
      • Order Genera Polymixia Berycopsis (extinct) Dalmatichthys (extinct) Omosoma (extinct) Omosomopsis (extinct) The beardfishes are a small family (Polymixiidae) of deep-sea marine ray-finned fish named for their pair of long hyoid barbels. About five species of the one living genus Polymixia are known, along with several fossil genera. At present... Polymixiiformes (beardfishes)
    • Paracanthopterygii
      • Order Percopsiformes is a small order of ray-finned fish, comprising the trout-perch and its allies. Families include the following: Percopsidae (trout-perches) Aphredoderidae (pirate perches) Amblyopsidae (cavefishes) ... Categories: Ray-finned fish ... Percopsiformes (trout-perches & allies)
      • Order Genera Subfamily Batrachoidinae Amphichthys Austrobatrachus Barchatus Batrichthys Batrachoides Batrachomoeus Chatrabus Halobatrachus Halophryne Opsanus Perulibatrachus Riekertia Sanopus Tharbacus Triathalassothia Subfamily Porichthyinae Aphos Porichthys Subfamily Thalassophryninae Daector Thalassophryne The toadfishes are a type of ray-finned fish normally found on the sand and mud bottoms of coastal waters worldwide, notable for somewhat... Batrachoidiformes (toadfishes)
      • Order Families Antennariidae Brachionichthyidae Caulophrynidae Centrophrynidae Ceratiidae Chaunacidae Diceratiidae Gigantactinidae Himantolophidae Linophrynidae Lophichthyidae Lophiidae Melanocetidae Neoceratiidae Ogcocephalidae Oneirodidae Tetrabrachiidae Thaumatichthyidae The Lophiiformes are a large and diverse order of ray-finned fish, also called the Pediculati. Many forms, generally called anglerfishes, have distinctive lures, small projections on the forehead used to... Lophiiformes (goosefishes, etc)
      • Order Families Euclichthyidae (Eucla cod) Lotidae Macrouridae (grenadiers or rattails) Moridae (morid cods or moras) Melanonidae (pelagic cods) Macruronidae (southern hakes) Bregmacerotidae (codlets) Muraenolepididae (eel cods) Phycidae (phycid hakes) Merlucciidae (merluccid hakes) Gadidae (true cods) Gadiformes is an order of ray-finned fish, also called the Anacanthini, that includes the cod... Gadiformes (cods & allies)
      • Order Families Carapidae - Pearlfishes Ophidiidae - Cusk Eels Bythitidae - Brotulas Aphyonidae - Aphyonids Parabrotulidae - False Brotulas Ophidiiformes is an order of ray-finned fish that includes the Cusk Eels, Pearlfishes, Brotulas, and others. This order includes a variety of species, including the deepest known, Abyssobrotula galatheae, found at 8,370 m in the... Ophidiiformes (cusk eels, etc)
    • Acanthopterygii
      • Order Genera Agonostomus Aldrichetta Cestraeus Cahaenomugil Chelon Crenimugil Joturus Liza Moolgarda Mugil Myxus Neomyxus Oedalechilus Rhinomugil Sicamugil Valaomugil Xenomugil The mullets are a family (Mugilidae) of ray-finned fish found worldwide in coastal temperate and tropical waters, and in some species in fresh water also. Mullets have served as an important... Mugiliformes (mullets & allies)
      • Order Families Suborder Bedotioidei Betodiidae Suborder Melanotaenioidei Melanotaeniidae (rainbowfishes) Pseudomugilidae (blue eyes) Suborder Atherinoidei Atherinidae (silversides) Notocheiridae Telmatherinidae (sailfin silversides) Dentatherinidae Phallostethidae Atheriniformes is an order of ray-finned fish that includes the silversides and several less-familiar families, including the unusual Phallostethidae. Members of the order usually have two dorsal... Atheriniformes (silversides & allies)
      • Order Families Suborder Adrianichthyoidei Adrianichthyidae - Ricefishes Suborder Belonoidei Superfamily Scomberesocoidea Belonidae - Needlefishes Scomberesocidae - Scauries Superfamily Exocoetoidea Exocoetidae - Flyingfishes Hemiramphidae - Halfbeaks Beloniformes is an order of ray-finned fish most notable for the flyingfishes and medakas. Originally, the two suborders Adrianichthyoidei and Belonoidei were part of the Cyprinidontiformes, but monophyly is indicated... Beloniformes (needlefishes, etc)
      • Order Families Cetomimidae Rondeletiidae Barbourisiidae Megalomycteridae Mirapinnidae The Cetomimiformes or whalefishes are an order of small, deep-sea ray_finned fish. Some authorities include the whalefishes as part of the order Stephanoberyciformes, within the superfamily Cetomimoidea. Within the Cetomimiformes are five families and approximately 18 genera. Thought to have a circumglobal distribution... Cetomimiformes (whalefishes)
      • Order Families Anablepidae (four-eyed fish) Cyprinodontidae (pupfish) Fundulidae Goodeidae Rivulinidae Poeciliidae (live-bearers) (and others) The Cyprinodontiformes is an order of ray-finned fish, also called the Microcyprini, and comprising mostly small, fresh-water fish. They are closely related to the Atheriniformes and are occasionally included with them. Many popular... Cyprinodontiformes (killifishes, etc)
      • Order Families Melamphaidae (ridgeheads) Gibberichthyidae (gibberfishes) Stephanoberycidae (pricklefishes) Hispidoberycidae Stephanoberyciformes is an order of marine ray-finned fishes, consisting of about 40 species, mostly uncommon deep-sea types. Common characteristics include a generally rounded body, a toothless palate, rather thin skull bones, and a missing orbitosphenoid bone (except for Hispidoberyx). J... Stephanoberyciformes (pricklefishes, whalefishes, etc)
      • Order Families (seven, see text) Suborder Berycoidei Berycidae -- alfonsinos, berycids Suborder Holocentroidei Holocentridae -- soldierfishes, squirrelfishes Suborder Stephanoberycoidei Suborder Trachichthyoidei Anomalopidae -- flashlight fishes, laterneye fishes Anoplogastridae -- fangtooth fishes, fangtooths Diretmidae -- spinyfins Monocentridae -- pineconefishes Trachichthyidae -- redfishes, roughies, slime heads External link http://www.itis.usda.gov ITIS Taxonomic Serial No.: 166083 Categories: Stub... Beryciformes (alfonsinos, etc)
      • Order Families Suborder Zeioidei Parazenidae Macrurocyttidae Zeidae (dories) Oreosomatidae (oreos) Grammicolepididae Suborder Caproidei Caproidae (boarfishes) Zeiformes is a small order of marine ray-finned fishes most notable for the dories, a common food fish. The order consists of about 40 species in six families, mostly deep-sea types. Zeiform bodies are... Zeiformes (dories, etc)
      • Order Families Suborder Gasterosteoidei Hypoptychidae (sand Eel) Aulorhynchidae (tubesnouts) Gasterosteidae (sticklebacks) Suborder Syngnathoidei Infraorder Syngnatha Superfamily Pegasoidea Pegasidae (seamoths) Superfamily Syngnathoidea Solenostomidae (ghost pipefishes) Syngnathidae (pipefishes and seahorses) Infraorder Indostomoida Indostomidae Infraorder Aulostomoida Superfamily Aulostomoidea Aulostomidae (trumpetfishes) Fistulariidae (cornetfishes) Superfamily Centriscoidea Macroramphosidae (snipefishes) Centriscidae (shrimpfishes) Gasterosteiformes is an order of ray... Gasterosteiformes (sticklebacks, pipefishes & allies)
      • Order Families Synbranchidae Chaudhuriidae Mastacembelidae Synbranchiformes is an order of ray-finned fishes that are eel-like but have spiny rays, indicating that they belong to the superorder Acanthopterygii. Categories: Ray-finned fish ... Synbranchiformes (swamp-eels, etc)
      • Order Families Balistidae - Triggerfishes Diodontidae - Porcupinefishes Molidae Monacanthidae - Filefishes Ostraciidae - Boxfishes Tetraodontidae - Pufferfishes Triacanthidae - Triplespines Triacanthodidae - Spikefishes Triodontidae - Three-toothed puffer The Tetraodontiformes are an order of highly derived ray-finned fish, also called the Plectognathi. Sometimes these are classified as a suborder of the Perciformes. The Tetraodontiformes are represented by... Tetraodontiformes (triggerfishes & allies)
      • Order Families Suborder Psettodoidei     Psettodoidae Suborder Pleuronectoidei     Citharidae     Scophthalmidae     Bothidae (lefteye flounders)     Pleuronectidae (righteye flounders)     Paralichthyidae     Achiropsettidae (southern flounders)     Samaridae Suborder Soleoidei     Soleidae (soles... Pleuronectiformes (flatfishes & allies)
      • Order Families See text Scorpaeniformes is an order of ray-finned fish, also called the Scleroparei, closely related to and sometimes included in the Perciformes. There are about 20 families: Suborder Dactylopteroidei     Dactylopteridae Suborder Scorpaenoidei     Scorpaenidae (scorpionfishes and rockfishes)     Caracanthidae   ... Scorpaeniformes (scorpionfishes & allies)
      • Order Families many, see text The Perciformes, also called the Percomorphi or Acanthopteri, include about 40% of all fish and are the largest order of vertebrates. The name Perciformes means perch-like. They belong to the ray-finned fish and comprise over 7000 different species, with varying shapes and sizes, found... Perciformes (perches & many allies)

External link

  • NCBI Taxonomy entry (http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?name=actinopterygii)


  • "Actinopterygii" (TSN 161061) (http://www.itis.usda.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=161061). The Integrated Taxonomic Information System or ITIS is a partnership designed to provide consistent and reliable information on the taxonomy of biological species. ITIS was originally formed in 1996 as the Interagency Taxonomic Information System, an interagency group within the US federal government, involving agencies from the Department of Commerce... Integrated Taxonomic Information System. N.p.: Integrated Taxonomic Information System, 2004. Accessed on December 8 is the 342nd day (343rd in leap years) of the year in the Gregorian calendar. There are 23 days remaining. Events 1854 - Pope Pius IX proclaims the dogma of Immaculate Conception, which holds that the Virgin Mary was born free of original sin. 1886 - American Federation of Labor... 8 December 2004 is a leap year starting on Thursday of the Gregorian calendar. It was designated the: International Year of Rice (by the United Nations) International Year to Commemorate the Struggle against Slavery and its Abolition (by UNESCO) Elections were held in 73 countries during 2004. See a list of elections... 2004.

  Results from FactBites:
Re: When did the Sarcopterygii separate from Actinopterygii? (294 words)
It is true that tetrapods (amphibians, reptiles, mammals, birds) descended from members of the Sarcopterygii, but accepted classification schemes do not put these highly derived descendants in with the fleshy-finned fish.
The oldest known fish are Cambrian, but these are primitive forms not assigned to either Sarcopterygii or Actinopterygii.
According to Romer (1966), the split probably occurred in the early Silurian or late Ordovician, though the oldest known fossils of these two groups are early Devonian.
  More results at FactBites »



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