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  • Occasionally found in large numbers on beaches, and in this case underwater, these  shells are actually egg cases, made by female Paper Nautilus, Argonauta hians. The tiny male Argonauts have no shell and die soon after mating, while females live in these delicate shells, which also serve as egg cases until  their brood hatches, after which the females die and the shells are abandoned.  Similan Islands, Thailand, Andaman Sea, Indian Ocean
    argoshel1CP.tif
  • Rarely seen by divers, this female Muddy Argonaut, a.k.a. Paper Nautilus, Argonuta hians, appears ready to abandon her egg-laden shell. This specimen had apparently been attacked and injured by a predator, which may have prompted the evacuation. While superficially resembling a nautilus, Argonauts are actually a type of pelagic octopus. Only females produce a shell, which also serves as an egg case. Males are much smaller, and seen even less often than females. Mergui Archipelago, Burma, Andaman Sea, Indian Ocean
    21JAN07OR073CP.tif
  • Muddy Argonaut, a.k.a. Paper Nautilus, Argonauta hians, grasping a jellyfish. Like the small butterfish, the Argonaut uses the jelly to shield it from predators. Argonauts are not true nautiluses, but rather a group of open-ocean octopuses.  Only the females produce the delicately beautiful shell, which is actually an egg case.  Mergui Archipelago, Myanmar, Andaman Sea, Indian Ocean
    argojf1_D800.tif
  • This rare photo shows a Muddy Argonaut, a.k.a. Paper Nautilus, Argonauta hians, grasping a jellyfish while feeding on a Comb Jelly. The Argonaut apparently uses the jellyfish to shield itself from predators. Argonauts are not true nautiluses, but rather a family of open-ocean octopuses.  Only the females produce the delicately beautiful shell, which is actually an egg case.  Mergui Archipelago, Myanmar, Andaman Sea, Indian Ocean
    argojf2CP.tif