The paired fins assist with steering, stopping and hovering. Fishes are generally grouped into three broad categories: the placoderms, the cartilaginous fishes and the bony fishes. ADAPTIVE RADIATION AND EVOLUTION: FISHES Purpose The purpose of this exercise is to illustrate some of the adaptive radiation and subsequent evolution of fishes. In evolutionary biology, adaptive radiation is a process in which organisms diversify rapidly from an ancestral species into a multitude of new forms, particularly when a change in the environment makes new resources available, creates new challenges, or opens new environmental niches. Both the cartilaginous and bony fishes may have arisen from either the placoderms or the spiny sharks. A subclass of bony fishes, the ray-finned fishes (Actinopterygii), have become the dominant group in the post-Paleozoic and modern world, with some 30,000 living … Adaptaive radiation 1. Adaptive Radiation of the fish under class Osteichthys: Bony fish also have special adaptations that allow them to remain buoyant. The placoderms include the primitive and extinct fishes, the cartilaginous fishes comprise the elasmobranchs and the holocephali, while the bony fishes include the … Scales in most bony fishes (most freshwater fishes other than gar that have ganoid scales, and catfish which have no scales) are either ctenoid or cycloid. ADAPTIVE RADIATION Definition The term adaptive radiation has been coined by H.F. Osborn (1902) for explaining evolution, from a single ancestor,of a number of descendants with a great variety of adaptations to different niches. WAIT TIL YOU SEE THE INSIDE OF THIS UGLY MAPLE LOG - Duration: 29:14. charley and sarah Recommended for you Osteichthyes (/ ˌ ɒ s t i ˈ ɪ k θ i iː z /), popularly referred to as the bony fish, is a diverse taxonomic group of fish that have skeletons primarily composed of bone tissue, as opposed to cartilage.The vast majority of fish are members of Osteichthyes, which is an extremely diverse and abundant group consisting of 45 orders, and over 435 families and 28,000 species. The caudal fin is the main fin for propulsion to move the fish forward. PRIMITIVE BONY FISH. A special organ called a swim bladder housed under the bony skeleton is a gas filled chamber that allows the bony fish to remain floating in the water. ADVERTISEMENTS: The below mentioned article provides a note on the evolution and classification of fishes.
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