Any fish of the family Clupeidae that lives in deep ocean waters and has a bony tail fin structure.
Compound of 'bone' + 'tail,' describing the fish's skeletal tail anatomy. Scientific classification refined the term in 19th-century ichthyology.
Bonetails are deep-sea fish that live in nearly complete darkness, and they're so rare that scientists have identified very few species—they're like aliens living beneath our oceans!
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