巨型乌贼是印度太平洋区一种大型的珊瑚礁乌贼，因其体型（外套膜长50厘米）和快速变色的能力而显得尤为壮

y is oblong and flattened, with a continuous undulating fin along its sides. It has tenarms, eight of which are short with suction cups and two long tentacles folded into pockets,each ending in a paddle bearing six large suction cups and numerous small ones. Itsdistinctive eyes are outlined with a yellow border, and the pupil is W-shaped with a smallnotch at the front. The colouring of the broad-handed cuttlefish is extremely variable(brown, yellowish, light, marbled), and the mantle can bristle and display transverse bandsor triangular patterns when stressed or excited. It frequents sandy areas at depths of a fewmetres to several tens of metres. It is observed alone or in small groups, hovering above thesubstrate or moving slowly using its lateral fin. It uses its excellent camouflage to approachprey and blend into the background. It has the ability to change colour at will thanks tochromatophores, with waves of colour moving along its body. If it feels threatened, it canbristle its mantle, display contrasting patterns, and then flee using jet propulsion from itssiphon, expelling water from its pallial cavity. It can emit a cloud of dark ink that roughlymimics the shape of its body, giving it time to retreat.