Abdopus aculeatus is a small octopus species in the order Octopoda. A. aculeatus has the common name of algae octopus due to its typical resting camouflage, which resembles a gastropod shell overgrown with algae. It is small in size with a mantle around the size of a small orange (~7cm) and legs 25cm in length, and is adept at mimicking its surroundings. Octopus bimaculoides may be a closely related species, as the two share many skin components that are the basis for their camouflage tactics, though this may also be evidence of evolutionary convergence.