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The seven-arm octopus is so named because in males, the hectocotylus (a specially modified arm used in egg fertilization) is coiled in a sac beneath the right eye. Due to this species' thick, gelatinous tissue, the arm is easily overlooked, giving the appearance of just seven arms. However, like other octopuses, it actually has eight. [5]
The giant Pacific octopus (Enteroctopus dofleini) is often cited as the largest known octopus species. Adults usually weigh around 15 kg (33 lb), with an arm span of up to 4.3 m (14 ft). [ 19 ] The largest specimen of this species to be scientifically documented was an animal with a live mass of 71 kg (157 lb). [ 20 ]
Octopus is the largest genus of octopuses, comprising about 100 species.These species are widespread throughout the world's oceans. Many species formerly placed in the genus Octopus are now assigned to other genera within the family.
Octopodidae — the family containing the majority of known octopus species. Pages in category "Octopodidae" The following 76 pages are in this category, out of 76 total.
Many octopus arm anomalies have been recorded, [13] [14] including a 6-armed octopus (nicknamed Henry the Hexapus), a 7-armed octopus, [15] a 10-armed Octopus briareus, [16] one with a forked arm tip, [17] octopuses with double or bilateral hectocotylization, [18] [19] and specimens with up to 96 arm branches. [20] [21] [22]
The World Register of Marine Species lists these 23 genera: [1] Abdopus Norman & Finn, 2001 (7 species) Ameloctopus Norman, 1992 (monotypic) Amphioctopus P. Fischer, 1882 (16 species) Callistoctopus Taki, 1964 (11 species) Cistopus Gray, 1849 (4 species) Euaxoctopus Voss, 1971 (3 species) Galeoctopus Norman, Boucher & Hochberg, 2004 (monotypic)
A type of marine mollusc in the Cephalopod class of the Mollusca order — the Octopus. The preferred plural form is Octopuses. The main article for this category is Octopus .
Argonauta argo, also known as the greater argonaut, is a species of pelagic octopus belonging to the genus Argonauta. The Chinese name for this species translates as "white sea-horse's nest". [2] A. argo was the first argonaut species to be described and is consequently the type species of the genus.