Amphioctopus
Amphioctopus is a genus of octopuses comprising around 16 species. Description. Members of the genus "Amphioctopus" reside in tropical and subtropical waters. These octopuses are found primarily in the Pacific and Indian Oceans but representatives can also be found in the Atlantic. They are characterized by arms that are about two or three times their mantle length with deep lateral webs and very shallow dorsal webs. This genus can be further divided into two subgroups, one group with ocellate octopuses, the other with non-ocellate octopuses. Taxonomic status. Historically, members of this genus were placed within the genus "Octopus , but recognized as forming a distinct group and referred to as the Octopus aegina" species complex. The genus was originally described by Fischer in 1882. He assigned to it the already described species, "Octopus membranaceus" (Quoy and Gaimard, 1832), as the type species (not to be confused with "Enteroctopus membranaceus" (Rochebrune and Mabille, 1889), the original types species of the genus "Enteroctopus"). Robson in his review of octopus taxonomy in 1929 regarded "Amphioctopus membranaceus" as a "nomen dubium", referring it to his newly named ""aegina" species complex", a group of octopuses forming a distinct constellation characterized by "Octopus aegina". The  genus "Amphioctopus" was subsequently considered invalid. In 2002, Gleadall suggested that the "aegina" species group represents a distinct genus with "Amphioctopus" being the senior name. In 2004, Gleadall resurrected the genus "Schizoctopus" and assigned "Octopus fangsiao" as the type species. In 2005, Huffard and Hochberg, arguing that Robson's designation of "Octopus membranaceus" as a "nomen dubium" was premature and considering it a valid name, resurrected the genus name "Amphioctopus" for the "Octopus aegina" species complex. Huffard and Hochberg also found "Schizoctopus" to be a junior synonym for "Amphioctopus". Species. Species marked with an asterisk (*) remain unresolved.