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Acipenseriformes / æ s ɪ ˈ p ɛ n s ə r ɪ f ɔːr m iː z / is an order of basal [1] ray-finned fishes that includes living and fossil sturgeons and paddlefishes (Acipenseroidei), as well as the extinct families Chondrosteidae and Peipiaosteidae. [2] [3] [4] They are the second earliest diverging group of living ray-finned fish after the ...
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.
Paddlefish (family Polyodontidae) are a family of ray-finned fish belonging to order Acipenseriformes, and one of two living groups of the order alongside sturgeons (Acipenseridae). [3] [4] They are distinguished from other fish by their elongated rostra, which are thought to enhance electroreception to detect prey.
The green sturgeon, like other sturgeons in the family Acipenseridae, possesses both mechanoreceptors and electroreceptors. [18] The lateral line system in sturgeon comprises two distinct types of sensory receptors: electrosensory ampullary organs (AOs) and mechanosensory neuromasts (NMs).
The Acipenseriformes are ray-finned fishes in order Acipenseriformes. This category contains subcategories corresponding to the families in this order. Subcategories
The Siberian sturgeon (Acipenser baerii) is a species of sturgeon in the family Acipenseridae.It is most present in all of the major Siberian river basins that drain northward into the Kara, Laptev and East Siberian Seas, including the Ob, Yenisei (which drains Lake Baikal via the Angara River) Lena, and Kolyma Rivers.
Some evidence has shown that developmental body color is related to migration style. Free embryos are light and are non-migratory, while migratory larvae and adults are dark. This is found to be consistent among many Acipenser species. The reason for this is unclear, but it may be adaptive to migration behavior and camouflage. [11]
Chondrostei is a group of non-neopterygian ray-finned fish.While the term originally referred to the paraphyletic grouping of all non-neopterygian ray-finned fish, it was redefined by Patterson in 1982 to be a clade comprising the Acipenseriformes (which includes sturgeon and paddlefish) and their extinct relatives.