A carp, an example of a teleost
The
teleosts (from
Greek for "complete bone") are an
infraclass of
ray-finned fishes that arose in the
Triassic period. Making up 96 percent of all known
fish species, this diverse group includes about 40
orders and 448
families. They inhabit oceans at all depths, estuaries, rivers, lakes and swamps. They range in size from the
giant oarfish, measuring 25 feet (7.6 m) or more, and the
ocean sunfish, weighing over 2.2 short tons (2 tonnes), to the male anglerfish
Photocorynus spiniceps, just 0.24 inches (6.2 mm) long. Teleosts can be torpedo-shaped, flattened (vertically or horizontally) or cylindrical, and some, like the
anglerfish and
seahorse, have unique shapes. They can
protrude their jaws, enabling them to grab prey and
draw it into their mouth. Depicted in art over the centuries, teleosts are economically important to humans. They are harvested for food, captured for sport, kept in aquariums, and used in research, especially in the fields of
genetics and
developmental biology. (
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