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Actinopterygii — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Actinopterygii
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-07T11:39:55.052Z
SHA-256 of the archived text: 340ca4dae76bf3bd70e3823345c431af741d071d84b5764e020ef0b7ce67ff0d
Stable URL of this page: https://metraipolis.com/documento/dc_7efbf64e4b41

How to cite

Actinopterygii — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Actinopterygii (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_7efbf64e4b41 (Metraipolis archive dc_7efbf64e4b41, sha256 340ca4dae76bf3bd70e3823345c431af741d071d84b5764e020ef0b7ce67ff0d)

BibTeX

@misc{dc7efbf64e4b41,
  title = {Actinopterygii — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Actinopterygii},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_7efbf64e4b41; sha256 340ca4dae76bf3bd70e3823345c431af741d071d84b5764e020ef0b7ce67ff0d},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Actinopterygii. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Actinopterygii ( ; from Ancient Greek ἀκτίς (aktís) 'ray, beam' and πτέρυξ (ptérux) 'wing, fins'), 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 8 mm (0.3 in), to the giant sunfish, at 2,700 kg (6,000 lb), and the giant oarfish, at 8 m (26 ft) (or possibly 11 m (36 ft)). The largest ever known ray-finned fish, the extinct Leedsichthys from the Jurassic, is estimated to have grown to 16.5 m (54 ft). 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).

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «Actinopterygii» — https://en.wikipedia.org/wiki/Actinopterygii
Wikidata Q127282: «classe di pesci ossei (Osteichthyes)» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q127282
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Actinopterygii?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1380779090, consultata il 2026-11-07T11:35:06.880Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 7402e3500d96b52a2eb90672438a948b06ba1467005e056817b4882cbef98aa2