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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]
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.
The ancestors of the ray-finned fishes (Actinopterygii) evolved their fins in a different direction. The tetrapodomorph ancestors of the tetrapods further developed their lobe fins. The paired fins had bones distinctly homologous to the humerus , ulna , and radius in the fore-fins and to the femur , tibia , and fibula in the pelvic fins.
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Actinopterygii: Subclass: Chondrostei: Order: Acipenseriformes L. S. Berg, 1940: Subgroups Genus †Eochondrosteus? Family †Chondrosteidae (sometimes placed in its own order) Family †Peipiaosteidae; Suborder Acipenseroidei. Family Acipenseridae (sturgeon) Family Polyodontidae (paddlefish)
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Diagram of flower parts. In botany, floral morphology is the study of the diversity of forms and structures presented by the flower, which, by definition, is a branch of limited growth that bears the modified leaves responsible for reproduction and protection of the gametes, called floral pieces.
Chloroplasts in leaf cells of the moss Mnium stellare. Plant anatomy or phytotomy is the general term for the study of the internal structure of plants.Originally, it included plant morphology, the description of the physical form and external structure of plants, but since the mid-20th century, plant anatomy has been considered a separate field referring only to internal plant structure.
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