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Actinopterygii (/ ˌ æ k t ɪ n ɒ p t ə ˈ r ɪ dʒ i aɪ /; from actino- 'having rays' and Ancient Greek πτέρυξ (ptérux) 'wing, fins'), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish [2] that comprise over 50% of living vertebrate species. [3]
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Evolution of ray-finned fishes, Actinopterygii, from the Devonian to the present as a spindle diagram. The width of the spindles are proportional to the number of families as a rough estimate of diversity. The diagram is based on Benton, M. J. (2005) Vertebrate Palaeontology, Blackwell, 3rd edition, Fig 7.13 on page 185.
Spindle diagram for the evolution of fish and other vertebrate classes. The diagram is based on Michael Benton, 2005. [1] Conventional classification has living vertebrates as a subphylum grouped into eight classes based on traditional interpretations of gross anatomical and physiological traits.
After suffering large losses during the Late Devonian extinctions, cartilaginous fishes (Chondrichthyes) and the Actinopterygii among the bony fishes (Osteichthyes) diversified. [ 2 ] The sections below describe the pre-Devonian origin of fish, their Devonian radiation , including the conquest of land by early tetrapods , and the post-Devonian ...
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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 ...