Bony fishes are divided into which two groups? a. hagfishes and lampreys b. sharks and ray-finne

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Bony fishes are divided into which two groups? a. hagfishes...

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Key Concepts

Ray-Finned Fishes (Actinopterygii)

Ray-finned fishes, or Actinopterygii, are one of the two main groups of bony fishes. Their fins are supported by long, thin, bony spines or 'rays,' which facilitate a variety of swimming techniques. This group encompasses the vast majority of fish species, showcasing significant diversity in form and habitat across aquatic environments.

Lobe-Finned Fishes (Sarcopterygii)

Lobe-finned fishes, or Sarcopterygii, represent the second primary group of bony fishes. They are characterized by their fleshy, lobed, paired fins, which are attached to their bodies by a single bone. This structure is evolutionarily significant as it is considered a precursor to the limbs of terrestrial vertebrates, bridging aquatic life and the emergence of land-dwelling species.

Bony Fishes (Osteichthyes)

Bony fishes, or Osteichthyes, are a diverse group of fish characterized by having a skeleton primarily composed of bone rather than cartilage. This group is distinguished within the broader vertebrate classification and represents a major evolutionary branch among fish, notable for their wide range of anatomical and physiological adaptations.

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