Umbrella octopuses are a group of pelagic octopuses. Umbrella octopuses are characterized by a web of skin between the tentacles, causing them to somewhat resemble an opened umbrella when the tentacles are spread.
The colossal squid is part of the family Cranchiidae. It is sometimes called the Antarctic squid or giant cranch squid and is believed to be the largest squid species in terms of mass. It is the only recognized member of the genus Mesonychoteuthis and is known from only a small number of specimens. The species is confirmed to reach a mass of at least 495 kilograms (1,091 lb), though the largest specimens—known only from beaks found in sperm whale stomachs—may perhaps weigh as much as 600–700 kilograms (1,300–1,500 lb), making it the largest-known invertebrate. Maximum total length has been estimated at 9–10 metres (30–33 ft).
Grimpoteuthis bathynectes is a deepwater species of so-called Dumbo octopus first described in 1990. So far only thirteen specimens have been recorded.
Grimpoteuthis abyssicola is a species of small deep-sea octopus known from a single female specimen. The specimen was found in the Tasman Sea off New Zealand, between 3,154 and 3,180 meters deep. More specifically, the octopus was found in the Lord Howe Rise.
Grimpoteuthis boylei is a species of octopus known from only ten individuals.
Grimpoteuthis challengeri is a species of large octopus living in the abyssal zone.
Grimpoteuthis discoveryi is a small species of octopus known from more than 50 specimens. It was described in 2003, but specimens have been found as early as 1910. The type species was found at 49°35'N, 14°01'W.
Grimpoteuthis hippocrepium is a species of octopus. It is only known from one specimen found in 1904, which was poorly preserved. Some characteristics G. hippocrepium are unknown.
Grimpoteuthis innominata is a species of small, pelagic octopus only known from two specimens. Steve O'Shea discovered it in 1999, and created the genus Enigmateuthis to contain it. Martin Collins placed the species in the genus Grimpoteuthis.
Grimpoteuthis megaptera is a species of umbrella octopus known from five specimens, collected by Addison Emery Verrill. Between two and three of these specimens may belong to different species.
Grimpoteuthis pacifica is an octopus known from one badly damaged specimen. It's not completely described, and it's not easily separated from some other species of octopus. Nothing clearly differentiates G. pacifica from Grimpoteuthis hippocrepium except for its type locality.
Grimpoteuthis plena is known from only one specimen, which cannot be easily separated from other species of Grimpoteuthis in the Atlantic Ocean. The specimen was in poor condition. It's similar to Grimpoteuthis wuelkeri, and may be a junior specimen of Grimpoteuthis umbellata.
Grimpoteuthis umbellata, known from three specimens, is the type species of Grimpoteuthis.
Grimpoteuthis wuelkeri is a medium-sized octopus characterized from multiple specimens.
Opisthoteuthis calypso is a species of genus Opisthoteuthis, which are known as the cirrate octopuses. Octopuses in this genus are known as the flapjack octopuses and can be found in a variety of oceans across the world.
Opisthoteuthis agassizii is a lesser-known, deep-sea octopus first described in 1883 by Addison E. Verrill.
Opisthoteuthis bruuni is a species of finned cirrate octopus found in waters near Antofagasta, Chile. Their tissue is almost jelly-like, and they have short, round bodies.
Opisthoteuthis depressa is an octopus found in waters near Japan.
Opisthoteuthis dongshaensis is a species of octopus located in the South China Sea.
Opisthoteuths massyae is an octopus living in the eastern Atlantic Ocean.
