What anatomical structure defines the Class Actinopterygii for the White Marlin?
Answer
Fins supported by bony rays
The Class Actinopterygii, to which the White Marlin belongs, is defined by the structural composition of its fins. Specifically, these ray-finned fishes possess fins that are supported by bony rays that articulate with and connect to the main body structure. This contrasts fundamentally with the fins found in Sarcopterygii, which possess fleshy, lobe-like structures. This skeletal arrangement in the fins provides the necessary mechanical support for maneuverability and propulsion required for the White Marlin's high-speed pelagic existence.

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