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Acipenser is a genus of sturgeons.With 17 living species (others are only known from fossil remains), it is the largest genus in the order Acipenseriformes.The genus is paraphyletic, containing all sturgeons that do not belong to Huso, Scaphirhynchus, or Pseudoscaphirhynchus, with many species more closely related to the other three genera than they are to other species of Acipenser.
Most living species of Acipenseriformes are classified as threatened (mostly endangered or critically endangered) by the International Union for Conservation of Nature. The Chinese paddlefish was last seen alive in 2003, and was considered to have gone extinct sometime between 2005 and 2010 by the Yangtze River Fisheries Research Institute in ...
[3] [4] The Sakhalin sturgeon (Acipenser mikadoi), which lives in the Amur River basin in China and Russia, and the green sturgeon (A. medirostris), which lives along the Pacific coast of North America, are two different species of sturgeon. Despite their geographical isolation, these two species may have had a recent common ancestor due to the ...
The factors have led researchers in the past to identify over 40 additional species that were rejected by later scientists. [11] Whether the species in the Acipenser and Huso genera are monophyletic (descended from one ancestor) or paraphyletic (descended from many ancestors) is still unclear, though the morphologically motivated division ...
The shortnose sturgeon (Acipenser brevirostrum) is a small and endangered species of North American sturgeon. The earliest remains of the species are from the Late Cretaceous Period, over 70 million years ago. [5] Shortnose sturgeons are long-lived and slow to sexually mature.
White sturgeon (Acipenser transmontanus) is a species of sturgeon in the family Acipenseridae of the order Acipenseriformes. They are an anadromous (migratory) fish species ranging in the Eastern Pacific; from the Gulf of Alaska to Monterey, California .
The green sturgeon (Acipenser medirostris) is a species of sturgeon native to the northern Pacific Ocean, from China and Russia to Canada and the United States. Description [ edit ]
The lake sturgeon (Acipenser fulvescens), also known as the rock sturgeon, [7] is a North American temperate freshwater fish, one of about 25 species of sturgeon.Like other sturgeons, this species is a bottom feeder and has a partly cartilaginous skeleton, an overall streamlined shape, and skin bearing rows of bony plates on the sides and back.