H. heteropsis is similar to its closest relative, H. meleagroteuthis, in the uniform, dense pattern of complex photophores on the head, arms IV and the mantle but lacks tubercules. This species is common off the coast of Southern California (USA) and has been observed from submersibles many times. It is lethargic in response to disturbance by an ROV; movements are slow and deliberate, even when jetting, inking is rarely observed (Hunt, 1966). The geographical distribution is unusual in that two separate populations exist one in the North Pacific and one in the South Pacific (antitropical distribution). It is found in temperate regions on the eastern side of the Pacific. Off southern California it occupies mesopelagic depths during the day and migrates vertically at night, presumably to feed. Maximum recorded size is 132 mm ML (Voss, et al., 1998).
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