Actinopterygii
Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that constitutes nearly 99% of the over 30,000 living species of fish. The vast majority of extant actinopterygian species are teleosts, and by species count they dominate the subphylum Vertebrata, comprising over 50% of all living vertebrates. They are the most abundant nektonic aquatic animals and are ubiquitous throughout freshwater, brackish and marine environments from the deep sea to subterranean waters to the highest mountain streams. Extant species can range in size from Paed
AI overview
Actinopterygii, commonly called ray-finned fish, are a class of bony fish that make up nearly 99% of all living fish species and account for over half of all living vertebrates. They are found in virtually every aquatic environment on Earth—from ocean depths to mountain streams—making them the most abundant swimming animals in water.
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Species
ray-finned fishes
Gigaclass
- PhylumChordata
Habitatmarine, brackish, freshwater
輻鰭魚又名条鳍鱼，为辐鳍鱼总纲（學名：Actinopterygii）鱼类的通称，是一类鰭呈放射狀的硬骨魚。輻鰭魚是脊椎動物中種類最多的，种数几乎占现存3万多种鱼类的99%，遍及淡水及海水環境。 在不同的分类系统中，辐鳍鱼的分类层级从下纲、亚纲、纲到总纲不等。基本上，广义的辐鳍鱼（Actinopterygii）包含了腕鳍鱼，而狭义的辐鳍鱼（Actinopteri）则成为腕鳍鱼的姐妹群。
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Wikidata facts
- Instance of
- taxon
- Parent taxon
- Osteichthyes
- Image
- Port Ghalib march 2006-0107.jpg
Show 7 more facts
Article
7 sectionsContents
- Characteristics
- Body shapes and fin arrangements
- Reproduction
- Classification and fossil record
- Taxonomy
- References
- External links
Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that constitutes nearly 99% of the over 30,000 living species of fish. The vast majority of extant actinopterygian species are teleosts, and by species count they dominate the subphylum Vertebrata, comprising over 50% of all living vertebrates. They are the most abundant nektonic aquatic animals and are ubiquitous throughout freshwater, brackish and marine environments from the deep sea to subterranean waters to the highest mountain streams. Extant species can range in size from Paedocypris, at , to the giant sunfish, at , and the giant oarfish, at (or possibly ). The largest ever known ray-finned fish, the extinct Leedsichthys from the Jurassic, is estimated to have grown to .
Ray-finned fish are so called because of their lightly built fins made of webbings of skin supported by radially extended thin bony spines called lepidotrichia, as opposed to the bulkier, fleshy fins of the sister clade Sarcopterygii (lobe-finned fish). Resembling folding fans, the actinopterygian fins can easily change shape, orientation and wetted area, providing superior thrust-to-weight ratios per movement compared to sarcopterygian and chondrichthyian fins. The fin rays attach directly to the proximal or basal skeletal elements, the radials, which represent the articulation between these fins and the internal skeleton (e.g., pelvic and pectoral girdles).