Shovel sturgeon
Shovel sturgeon | ||||||||||||
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White shovel sturgeon ( Scaphirhynchus albus ) |
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Scaphirhynchinae | ||||||||||||
Bonaparte , 1846 |
The shovel sturgeon ( Scaphirhynchinae) are a subfamily of the sturgeon (Acipenseridae). It comprises two genera , one in North America and one in Central Asia, with 3 species each . The fish have a flattened rostrum . There is no spiraculum . The Scaphirhynchinen are probably not a phylogenetic unit at all, but rather belong as dwarf forms to the acipenserines of their geographic region (Grande and Bemis 1991).
The Asian species are relatively small for sturgeon with lengths of 27 to 70 centimeters. They are endemic to the Amu-Darja and Syr-Darja rivers , which flow into the Aral Sea . All three species are considered endangered.
species
- Genus Pseudoscaphirhynchus , (3 species in Central Asia, short, unarmored caudal fin stalk)
- Syrdarja shovel sturgeon ( Pseudoscaphirhynchus fedtschenkoi )
- Small Amu Darya shovel sturgeon ( Pseudoscaphirhynchus hermanni )
- Large Amu Darya shovel sturgeon ( Pseudoscaphirhynchus kaufmanni )
- Genus Scaphirhynchus (3 species in North America, long, armored tail fin stalk)
- White shovel sturgeon ( Scaphirhynchus albus )
- Shovel sturgeon ( Scaphirhynchus platorynchus )
- Alabama shovel sturgeon ( Scaphirhynchus suttkusi )
Tribal history
Protopsephurus from the Lower Cretaceous in China is considered to be the oldest shovel sturgeon . It is systematically the sister group of all other taxa .
literature
- Kurt Fiedler, Textbook of Special Zoology, Volume II, Part 2: Fish , Gustav Fischer Verlag Jena, 1991, ISBN 3-334-00339-6 .
- Joseph S. Nelson , Fishes of the World , John Wiley & Sons, 2006, ISBN 0-471-25031-7 .