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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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Statistical charts and diagrams (1 C, ... (17 P) Ι. Diagram images (2 C, 1 P, 1 F) ... Free body diagram; Function block diagram; Function tree;
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Osteichthyes is divided into the ray-finned fish (Actinopterygii) and lobe-finned fish (Sarcopterygii). The oldest known fossils of bony fish are about 420 million years ago, which are also transitional fossils , showing a tooth pattern that is in between the tooth rows of sharks and bony fishes.
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 ...
Tkinias 14:34, 30 June 2006 (UTC) Despite the veracity of Gene Helfman's comments, every phylogenetic analysis that has included both gasterosteiform and syngnathiform fishes during the last 14 years has recovered them as two distinct and unrelated groups. The gasterosteiforms being more closely related to the sculpins. The relationships of the ...