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giant isopod is any of the almost 20 species of large isopods (crustaceans distantly related to the shrimp and crabs, which are decapods) in the genus Bathynomus. They are abundant in cold, deep waters of the Atlantic, Pacific and Indian Oceans.[1][2] Bathynomus giganteus, the species upon which the generitype is based, is often considered the largest isopod in the world, though other comparably poorly known species of Bathynomus may reach a similar size (e.g., B. kensleyi).[1]

French zoologist Alphonse Milne-Edwards was the first[3] to describe the genus in 1879[4] after his colleague Alexander Agassiz collected a juvenile male B. giganteus from the Gulf of Mexico; this was an exciting discovery for both scientists and the public, as at the time the idea of a lifeless or "azoic" deep ocean had only recently been refuted by the work of Sir Charles Wyville Thomson and others. No females were recovered until 1891.

Giant isopods are of little interest to most commercial fisheries owing to the typical scarcity of catches and because ensnared isopods are usually scavenged beyond marketability before they are recovered. The species are noted for resemblance to the common woodlouse or pill bug, to which they are related. The few specimens caught in the Americas and Japan with baited traps are sometimes seen in public aquariums.

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