Where did teleosts come from?
External relationships. The teleosts were first recognised as a distinct group by the German ichthyologist Johannes Peter Müller in 1845. The name is from Greek teleios, “complete” + osteon, “bone”.
When did teleosts originate?
Teleosts are the dominant fish of the present day. They arose in the Mesozoic era, and include 20,000 living species. The oldest teleost fossils date back to the late Triassic. They evolved from fish like bowfins in the clade Holostei.
Why are teleosts so successful?
With the emergence of molecular and genetic techniques to probe evolution, researchers have also attributed teleost success to a genome duplication event in the evolutionary past that left the fish with twice the number of chromosomes and thus more raw material with which to acquire beneficial mutations and to evolve.
Are teleosts bony?
teleost, (infraclass Teleostei), any member of a large and extremely diverse group of ray-finned fishes. Along with the chondrosteans and the holosteans, they are one of the three major subdivisions of the class Actinopterygii, the most advanced of the bony fishes.
Is Shark a teleost?
They are divided into two broad groups: teleosts, which have a bony skeleton and symmetrical tail and include most familiar fish species, and elasmobranchs, which have a skeleton made of cartilage and include sharks, rays and skates.
Is teleost a class?
Ray-finned fishesTeleost / Class
Are cichlids teleosts?
As in many other teleosts, the diet of cichlids can vary during the life cycle, and morphology will then vary with age. Because a particular feeding habit may have evolved in several different lineages, the dental adaptations often vary.
Are salmon Teleosts?
Found from the surf zone to the abyssal depths of the ocean, teleosts include eels, catfish, tarpon, tuna, halibut, flounder, trout, cod, herring, salmon, and many other tasty and nutritious fish. They also include the fantail goldfish shown here.
Does Actinopterygii have jaws?
Although they are bony fish, they do not have scales; instead, they have a thin skin stretched over a series of bony plates arranged in rings throughout their body….Classification of Fishes.
What did Stingrays evolve?
Skates and rays evolved from some bottom-living sharklike ancestor during the Jurassic. The primary evolution and diversification of modern sharks, skates, and rays took place in the Cretaceous Period and Cenozoic Era.
What did Acanthodians evolve?
Overall, the acanthodians’ jaws are presumed to have evolved from the first gill arch of some ancestral jawless fishes that had a gill skeleton made of pieces of jointed cartilage.