Glass octopuses weren't discovered until 1918. Related: Photos: Ghostly dumbo octopus dances in the deep sea The expedition crew reported two encounters with the glass octopus – an impressive count given that previously there was such limited footage of these clear cephalopods, scientists had to learn about them by studying chunks of them in the gut contents of their predators. Like other "glass" creatures, such as glass frogs and certain comb jellies, glass octopuses are almost completely transparent, with only their cylindrical eyes, optic nerve, and digestive tract appearing opaque. Marine biologists spotted the elusive glass octopus ( Vitreledonella richardi) during a 34-day expedition off the remote Phoenix Islands, an archipelago located more than 3,200 miles (5,100 kilometers) northeast of Sydney, Australia.
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