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Arms and buccal mass of the squid Taningia danae.As in other Octopoteuthidae, the tentacles are absent in adults. Oral view of the bobtail squid Semirossia tenera Head and limbs of the bobtail squid Rossia glaucopis Oral view of male Bathypolypus arcticus with hectocotylus on arm III (left) Cephalopod suckers and configuration of suckers on tentacular club Serrated suckers of a giant squid ...
In male seven-arm octopuses (Haliphron atlanticus), the hectocotylus develops in an inconspicuous sac in front of the right eye that gives the male the appearance of having only seven arms. In argonauts , the male transfers the spermatophores to the female by putting its hectocotylus into a cavity in the mantle of the female, called the pallial ...
The common blanket octopus (Tremoctopus violaceus) exhibits one of the most extreme sexual size-dimorphism known in any animal near its size or larger. [3] [4] Females may reach 2 m (6.6 ft) in length, whereas the males are 2.4 cm (1 inch). The weight ratio is at least 10,000:1, and can probably reach as much as 40,000:1.
The infundibulum provides adhesion while the acetabulum remains free, and muscle contractions allow for attachment and detachment. [34] [35] Each of the eight arms senses and responds to light, allowing the octopus to control the limbs even if its head is obscured. [36] A finned Grimpoteuthis species with its atypical octopus body plan
In 2002, a giant specimen of Haliphron atlanticus, the seven-arm octopus, was caught by fishermen trawling at a depth of 920 m (3,020 ft) off the eastern Chatham Rise, New Zealand. This specimen, the largest of this species and possibly of all octopuses, was the first validated record of Haliphron from the South Pacific.
The Abdopus capricornicus is known for having mottled skin with their most distinguishable features being white rings going down their arms and small ringed white spots scattered around their body. This octopus also has white spots along the dorsal mantle of its body. These white spots are characteristic as their shape is crescent-like. [7] "
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 common octopus (Octopus vulgaris) is a mollusk belonging to the class Cephalopoda. Octopus vulgaris is one of the most studied of all octopus species, and also one of the most intelligent. It ranges from the eastern Atlantic, extends from the Mediterranean Sea and the southern coast of England , to the southern coast of South Africa.