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05.03: Origin and Evolution of Life

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on 14 July 2014

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Transcript of 05.03: Origin and Evolution of Life

05.03: Origin and Evolution of Life
Bony Fishes
more fish that are like the bony fish
the fish that is like bony fish: Fossils of sardine-size fish that swam in ancient oceans are the earliest examples of vertebrates with teeth that grow from their jawbones, according to new a new study.
The fish, which lived 420 million years ago, are a "very modest" beginning for the jaw-and-tooth pattern widespread in nature today, said study co-author Philippe Janvier, a paleontologist at the National Museum of Natural History in Paris, France.
How the bony fishes have evolve?
Fish of the class Osteichthyes, characterized by a skeleton composed of bone in addition to cartilage, gill covers, and an air bladder.
most of the bony fish evolved during the Triassic period, about 200 million years ago.
The most recently evolved orders of bony fishes include the Pleuronectiformes (flatfishes) and Tetraodontiformes (triggerfishes, pufferfishes, and molas).
Size: Thousands of species of bony fishes are less than a few centimeters long as adults. The longest bony fish is the oarfish that can reach 11m

Body Shape: the "typical" fish body shape is roughly cylindrical and tapering at both ends. Various species of fishes deviate from the fusiform body shape in three ways: compression, depression, and elongation.
Activity: Many species spend most of their time lying on the ocean bottom. Bottom-dwellers include stonefishes (Synanceja spp.), flatfishes (order Pleuronectiformes), and blennies (family Blennidae).

Swimming: Most species of bony fishes propel themselves with the caudal fin, but many species use other fins for propulsion.

Sound Production: Many bony fishes produce sound, sometimes in association with reproductive, social, territorial, or aggressive behavior.
the biggest bony fish
Modern bony fish such as cod, herring, and coelacanths have this tooth arrangement. So do tetrapods-four
When a bony fish or a tetrapod loses a tooth, a new one grows from the bone below the void, whereas other jawed vertebrates, such as sharks, have teeth that grow from inside their gums. Sharks have skeletons of cartilage instead of bone.
Though fossil representatives of the earliest members of each of these living groups are well known, the earliest stages of jawed vertebrate evolution presents a fuzzier picture
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