Amphioctopus Marginatus belongs to the Kingdom Animalia because like the other members of this kingdom it is both multicellular and heterotrophic. This species is also part of the phylum Mollusca because, like other molluscs, it has a coelum (letter B on the first phylogenic tree), a visceral body mass and a mantle (letter C). Furthermore, since it is not part of the phylum Chordata, it does not have the notochord (letter A) (Doc 2). It belongs to the class of Cephalopods, because like other members of this class, such as Asteroceras Confusum, the Marginatus has a united head and foot (letter F), a siphon (letter D) and a ring of tentacles (letter E) that surrounds it the head (Doc 1). As a member of the order Octopoda, this species has eight arms (Letter G) (Doc 3). Furthermore, both the Incirrina and Cirrina subgroups have a reduced shell size (letter H) (Doc 3). As a member of the Incirrina suborder, the Veined Octopus does not have the cirrha (letter J) which is only found in the Cirrina suborder (Doc 5). The letter I represents the lack of even fins on the head, an aspect which is common...