The worm was parasitic on a crevalle jack of the New York Aquarium. The Pacific crevalle jack has 21 to 27 gill rakers and 24 vertebrae. The Pacific crevalle jack inhabits the tropical to subtropical waters of the eastern Pacific Ocean. The crevalle jack is also a revered gamefish, taken both by lures and bait. The crevalle jack is also known from Saint Helena Island in the southern Atlantic Ocean. In 1972, a crevalle jack caught by fishermen off South Carolina displayed swollen, bulbous mandibles.