Well-known octopus measuring 10 cm in mantle length and 50 cm in total
length. Skin with low tubercle-like warts that give a net-work-like pattern.
Umbrella rather narrow, with arm formula 3,2,4,1 or 3,4,2,1. Male's right
Arm V hectocotylized with rather small lingula attaining 4% of the arm.
Half demibranchs 9-10. Dark greenish brown to dark brown.
Distribution:
Warm temperate regions of the world oceans.
Remarks:
American stocks have been occasionally called O. rugosus or O. americanus which are now regarded as synonyms.