Actinopterygii
Actinopterygii[edit | edit source]
Actinopterygii, also known as ray-finned fishes, are a class of bony fishes that constitute the largest class of vertebrates in existence today. They are characterized by the presence of lepidotrichia, or "fin rays," which are bony spines that support their fins. This group includes over 30,000 species, making it the most diverse class of vertebrates.
Anatomy[edit | edit source]
The anatomy of actinopterygian fishes is highly varied, reflecting their diverse lifestyles and habitats. However, they share some common features:
- Skeleton: Actinopterygians have a bony skeleton, which is lighter and more flexible than the cartilaginous skeletons of cartilaginous fishes.
- Fins: Their fins are supported by bony or cartilaginous spines known as rays.
- Scales: Most have scales that cover their bodies, which can be ganoid, cycloid, or ctenoid.
- Swim bladder: Many have a swim bladder, an internal gas-filled organ that helps them maintain buoyancy.
Evolution[edit | edit source]
Actinopterygii have a long evolutionary history, with fossils dating back to the late Silurian period. They have undergone significant diversification, leading to the wide variety of forms seen today. The group is divided into two subclasses: Chondrostei and Neopterygii.
Diversity[edit | edit source]
Actinopterygii are found in a wide range of aquatic environments, from deep oceans to freshwater rivers and lakes. They exhibit a vast array of adaptations that allow them to thrive in different ecological niches.
Notable Species[edit | edit source]
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Ecology[edit | edit source]
Actinopterygii play crucial roles in aquatic ecosystems. They are primary consumers, predators, and prey, forming essential links in food webs. Many species are also important to humans for food, recreation, and economic purposes.
Related Pages[edit | edit source]
Gallery[edit | edit source]
Ancylopsetta dilecta
Anableps anableps
Diaphus metopoclampus
Gonostoma elongatum
Anoplogaster cornuta
Actinopterygii
Anatomia dei pesci
Bluefin
Swordfish
Salmo salar
Atlantic cod
Ancylopsetta dilecta
Anableps anableps
Diaphus metopoclampus
Gonostoma elongatum
Anoplogaster cornuta
Melanocetus johnsonii
Actinopterygii[edit | edit source]
Actinopterygii
Anatomia dei pesci
Bluefin
Swordfish
Salmo salar
Atlantic cod
Ancylopsetta dilecta
Anableps anableps
Diaphus metopoclampus
Gonostoma elongatum
Anoplogaster cornuta
Melanocetus johnsonii
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