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This may be the largest species of Galiteuthis if it reaches a length of 2.7 m ML as Nesis (1982) thinks. G. phyllura has been observed repeatedly by underwater vehicles. Hunt (1996) describes a behavior observed by an ROV that may be typical of many cranchiids. When disturbed, this squid hyperinflates the mantle with water and releases ink inside the mantle cavity. It thereby transforms itself from a nearly transparent squid into a very dark one.