What anatomical characteristic defines the Class Actinopterygii for *Danio rerio*?
Answer
Fins supported by thin, bony spines radiating outward.
The Class Actinopterygii is specifically designated as the ray-finned fishes because the morphology of their fins is supported by numerous thin, bony spines or rays that project outward from the body structure. This anatomical distinction is crucial as it differentiates them evolutionarily from lobe-finned fish, such as lungfish, which are more closely related to terrestrial vertebrates. The other options relate to different aspects of its classification: lack of mouth teeth is characteristic of the Order Cypriniformes, a rich family grouping pertains to Cyprinidae, and shared genetics with humans derives from its placement in Chordata.
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