A fish of a large group having thin fins strengthened by slender rays, including all bony fishes apart from the coelacanth and lungfishes. Compare with lobe-finned fish, teleost.
- Subclass (or class) Actinopterygii: numerous orders.
- This mounted skeleton of the common perch shows several characteristics of ray-finned fish.
- While everyone knows that fish live in water and breathe through gills, the simile ‘like a fish out of water’ does not always apply to ray-finned fish.
- Gliding is actually common among vertebrates; several reptiles, mammals, and even ray-finned fish have evolved gliding.
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