[2] Opisthoteuthis grimaldii lives in the Northeast Atlantic Ocean from 1,135–2,287 m (3,724–7,503 ft) deep.

[3] The type specimen, upon which the species' description was based, was captured near Faial Island.

[5] In the early 1900s, many octopuses living all over the Atlantic and Indian oceans were classed as Opisthoteuthis grimaldii, but later scientists decided that only those specimens found in the Eastern Atlantic Ocean actually belonged to the species.

[6] This octopus occupies in the bathyal zone, a deep area of the ocean where no sunlight reaches.

[4] The largest specimen was 250 mm (9.8 in) long, which is neither very large nor very small for an opisthoteuthid.