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Fish are a paraphyletic group: that is, any clade containing all fish also contains the tetrapods, which are not fish. For this reason, groups such as the "Class Pisces" seen in older reference works are no longer used in formal classifications.
Fish are classified into the following major groups:
- Subclass Pteraspidomorphi (early jawless fish)
- Class Thelodonti
- Class Anaspida
- (unranked) Cephalaspidomorphi (early jawless fish)
- (unranked) Hyperoartia or Petromyzontida
- Petromyzontidae (lampreys)
- Class Galeaspida
- Class Pituriaspida
- Class Osteostraci
- (unranked) Hyperoartia or Petromyzontida
- Infraphylum Gnathostomata (jawed vertebrates)
- Class Placodermi (armoured fishes, extinct)
- Class Chondrichthyes (cartilaginous fish)
- Class Acanthodii (spiny sharks, extinct)
- Superclass Osteichthyes (bony fish)
- Class Actinopterygii (ray-finned fish)
- Subclass Chondrostei
- Order Acipenseriformes (sturgeons and paddlefishes)
- Order Polypteriformes (reedfishes and bichirs).
- Subclass Neopterygii
- Infraclass Holostei (gars and bowfins)
- Infraclass Teleostei (many orders of common fishes)
- Subclass Chondrostei
- Class Sarcopterygii (lobe-finned fish)
- Subclass Coelacanthimorpha (coelacanths)
- Subclass Dipnoi (lungfish)
- Class Actinopterygii (ray-finned fish)
Some palaeontologists consider that Conodonta are chordates, and so regard them as primitive fish. For a fuller treatment of classification, see the vertebrate article.
The various fish groups taken together account for more than half of the known vertebrates. There are almost 28,000 known extant species of fish, of which almost 27,000 are bony fish, with the remainder being about 970 sharks, rays, and chimeras and about 108 hagfishes and lampreys.[12] A third of all of these species are contained within the nine largest families; from largest to smallest, these families are Cyprinidae,Gobiidae, Cichlidae, Characidae, Loricariidae, Balitoridae, Serranidae, Labridae, and Scorpaenidae. On the other hand, about 64 families are monotypic, containing only one species. It is predicted that the eventual number of total extant species will be at least 32,500.[13]
What else can I help you with?
Does a blow fish live in fresh water?
The blow fish species are often found in saltwater environments. Some species can tolerate brackish water.
Is a puffer fish a salt water fish or a fresh water fish?
it's actually both. there are fresh water puffers and saltwater puffers and brackish water puffers. the fresh water ones tend to be large (2ft for some species) for a more accurate answer i need a species name for the puffer
Where do puffer fish come from?
Puffer fish can be found in various regions around the world, particularly in tropical and subtropical waters. They inhabit coastal areas in the Pacific, Indian, and Atlantic Oceans. Some species of puffer fish are also found in freshwater environments like rivers and lakes.
Where do Osteichthyes live?
Osteichthyes, or bony fish, live in a wide variety of aquatic environments including freshwater, saltwater, and brackish water around the world. They can be found in rivers, lakes, oceans, and estuaries.
Where can you find hatchetfish?
Marine hatchet fish can be found in the tropical and subtropical waters of the Atlantic, Pacific and Indian Oceans. There is also a Freshwater Hatchet fish which can be found in Panama and South America. These two groups of fish are unrelated.
Does a garr fish live in brackish water?
they can be dripped into brackish water tanks
Can sharks live in brackish water?
YES! Bull sharks mainly stay in brackish waters. They have the ability to swim up the river. Bull sharks have been found at the end of the Mississippi river in the Northern Part of America.
What is the name of a fish that goes between salt water and fresh water?
Brackish?
What is most likely to contain brackish water?
Estuaries are most likely to contain brackish water, which is a mix of freshwater from rivers and saltwater from the ocean. Other areas where brackish water can be found include salt marshes, coastal lagoons, and mangrove swamps.
Can tropical fish live wth brackish fish?
Tropical and brackish are not mutually exclusive. Tropical means warm, and brackish means somewhat salty. Many brackish fish ARE tropical, and many tropical fish are brackish. You can keep tropical brackish fish with other tropical brackish fish, if they have the same temperment and will not harm or eat eachother. You can keep some brackish fish with some freshwater tropicals, and similarly you can keep some brackish fish with some marine tropicals. There are no wide open set of principles for brackish fish compatability beyond those that I have just illustrated.
Do flounder live in salt and fresh water?
Flounders are saltwater fish, some can be kept temporarily in brackish water.
Does a blow fish live in fresh water?
The blow fish species are often found in saltwater environments. Some species can tolerate brackish water.
What word describes water that is not fresh and partly salty?
Brackish water is used to describe water that is a mix of fresh and saltwater, typically found in estuaries.
What do you call a mix of fresh and salt water?
A mix of fresh and salt water is called brackish water. This type of water is found in estuaries, where rivers meet the sea, creating a unique ecosystem that supports diverse wildlife.
What kind of fish has a pig snout and swims in the French Broad River?
Pigfish are members of the grunt family of fish that are frequently found in the coastal waters of North and South Carolina. Although most are salt water fish, there are some brackish and fresh water varieties.
Can flounders live in salt water and fresh water?
Flounders are Saltwater Fish, some can be kept temporarily in brackish water.
Are frogs and alligator found in salt water?
Not normally. They are both fresh water organisms, but both are often found in brackish water.
