Temporal range:
Atlantic sturgeon flipped.jpg
Atlantic sturgeon
(Acipenser oxyrhynchus)
Paddlefish (white background).jpg
American paddlefish
(Polyodon spathula)
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Subclass: Chondrostei
Order: Acipenseriformes
L. S. Berg, 1940
Fossil of the chondrosteid Strongylosteus hindenburgi, Tübingen
The living polyodontid Polyodon spathula (American paddlefish)
The living acipenserid Acipenser ruthenus (sterlet)
The living acipenserid Pseudoscaphirhynchus kaufmanni (false shovelnose sturgeon)

Acipenseriformes /æsɪˈpɛnsərɪfɔːrmz/ 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 bichirs. Despite being early diverging, they are highly derived, having only weakly ossified skeletons that are mostly made of cartilage, and in modern representatives highly modified skulls.[5]

  1. ^ Venkatesh, B. (December 2003). "Evolution and diversity of fish genomes". Current Opinion in Genetics & Development. 13 (6): 588–592. doi:10.1016/j.gde.2003.09.001. PMID 14638319.
  2. ^ Froese, Rainer, and Daniel Pauly, eds. (2006). "Acipenseriformes" in FishBase. 05 2006 version.
  3. ^ Bemis, William E.; Findeis, Eric K.; Grande, Lance (1997). "An overview of Acipenseriformes". Environmental Biology of Fishes. 48 (1–4): 25–71. doi:10.1023/A:1007370213924. S2CID 24961905.
  4. ^ Lu, Liwu; Tan, Kai; Wang, Xi (2020). "Redescription of Eochondrosteus sinensis (Acipenseriformes, Actinopterygii) and its geological age". Earth Science Frontiers. 27 (6): 371–381.
  5. ^ Bemis, William E.; Findeis, Eric K.; Grande, Lance (2002), Birstein, Vadim J.; Waldman, John R.; Bemis, William E. (eds.), "An overview of Acipenseriformes", Sturgeon Biodiversity and Conservation, Dordrecht: Kluwer Academic Publishers, vol. 17, pp. 25–71, doi:10.1007/0-306-46854-9_4, ISBN 978-0-7923-4517-6, retrieved 2022-07-27

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