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Fish: Fish : GARS
Gars are a small group of two genera and seven living species placed in a single family, Lepisosteidae, and order Lepisosteiformes. These gars should not be confused with teleost fishes of the families Belonidae and Hemiramphidae whose species are called gars in some countries. Living gars are restricted to eastern North America south to Costa Rica as well as Cuba and the Isia de Pines.
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Posted by Posters on Tuesday, December 07 @ 14:10:58 CST (1784 reads)
(Read More... | 3514 bytes more | 6 comments | Fish | Score: 4) |
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Fish: Fish : Paddlefishes
Paddlefishes are elongate fishes and are largely scaleless, having only a few scales on the upper lobe of the caudal fin. Their elongate snouts, flattened from top to bottom, make up 36 to 52 percent of the total length of the adult. Unlike that of gars, this elongation involves the beak and the snout and is covered with electroreceptors and supported by star-shaped bones. There are two living species, the American paddlefish Polyodon spathula of North America and the Chinese paddlefish Psephurus gladius. Only Polyodon has a fossil record, from the Paleocene of Montana. Related extinct genera are known from the Cretaceous period (145 to 65 million years ago) to the Eocene (57 to 37 million years ago) of North America.
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Posted by Posters on Monday, December 06 @ 21:51:11 CST (1492 reads)
(Read More... | 2818 bytes more | 4 comments | Fish | Score: 0) |
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Fish: Fish : Sturgeons
Sturgeons are unique among actinopterygians as they have five rows of bony plates on the body. They are elongate fishes with flattened snouts, a protractile mouth located under the head, and fleshy tentacle-like projections (barbels) used for searching the sediment for prey.
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Posted by Posters on Monday, December 06 @ 21:48:35 CST (2023 reads)
(Read More... | 5316 bytes more | 4 comments | Fish | Score: 0) |
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Fish: Fish : STURGEONS AND PADDLEFISHES
Sturgeons and paddlefishes are members of the order Acipenseriformes. The sturgeons, family Acipenseridae, and the paddlefishes, family Polyodontidae, are both confined to the northern hemisphere. They are united by a number of characters of a technical nature. Relatively few genera of fossil sturgeons and paddlefishes are known. They occur from the late Jurassic period (about 150 million years ago) to the Pleistocene epoch (2 million to 10,000 years ago) and are confined, like the living species, to the northern hemisphere.
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Posted by Posters on Monday, November 29 @ 01:42:54 CST (1820 reads)
(Read More... | 747 bytes more | 4 comments | Fish | Score: 0) |
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Fish: Fish: Bichirs & Their Allies
Bichirs & Their Allies
Bichirs, sturgeons, paddlefishes, gars, and the bowfin are the living remnants of a diverse assemblage of extinct fishes. They have a worldwide freshwater and marine fossil record dating from the Permian period (285 to 245 million years ago) and, together with the teleost fishes, they make up the subclass Actinopterygii.
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Posted by Posters on Monday, November 29 @ 01:33:21 CST (1717 reads)
(Read More... | 690 bytes more | 5 comments | Fish | Score: 5) |
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