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Use "hagfishes" in a sentence
"For example, the first gill arch in jawless fishes like lampreys (and in embryos of jawed vertebrates) corresponds to the jaws in those vertebrates that have them (that is, all modern vertebrates except lampreys and hagfishes)."
"First in are the sharks and hagfishes, the black eel-like creatures with radial, rasping maws that strip the flesh."