A family of marine fish known as pearlfishes, small elongated fish that often live inside sea cucumbers or other marine animals.
Modern scientific Latin name derived from carapax/carapace, referring to the shell-like appearance or behavior of these fish, with -idae suffix standard in zoological nomenclature.
Pearlfishes practice one of nature's strangest parasitism—they live inside sea cucumbers' bottoms, and scientists named them using a word for shells because early naturalists thought they looked armored.
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