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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.
Several synapomorphies support this hypothesis, such as the presence of: sclerotic ossicles, paired pectoral fins, a dermal skeleton with three layers (a basal layer of isopedin, a middle layer of spongy bone, and a superficial layer of dentin), and perichondral bone. [10] Other groups Other groups † Pteraspido-morphi (extinct)
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.
Acipenser oxyrinchus is a species with two subspecies: . Atlantic sturgeon, Acipenser oxyrinchus oxyrinchus Mitchill 1815.; Gulf sturgeon, Acipenser oxyrinchus desotoi Vladykov 1955.
The Acipenseriformes are ray-finned fishes in order Acipenseriformes. This category contains subcategories corresponding to the families in this order. Subcategories
The ptersosaur lived roughly 170 million years ago and ruled the skies with a wingspan of more than 8 feet, roughly equivalent to a modern-day albatross.
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.