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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 ...
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 ...
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. [35] [36] Each of the eight arms senses and responds to light, allowing the octopus to control the limbs even if its head is obscured. [37] A finned Grimpoteuthis species with its atypical octopus body plan
Macroctopus maorum is a large octopus and it is regularly described as a ‘robust’ species, it is a member of the Octopus macropus species complex. The morphological traits characteristic of this complex are a high number of gill lamellae, a robust conical copulatory organ and arms of varying length with long unequal dorsal arms generally four to six times longer than the mantle.
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] "
Octopodiformes is a superorder of the subclass Coleoidea, comprising the octopuses and the vampire squid.All living members of Octopodiformes have eight arms, either lacking the two tentacles of squid (as is the case in octopuses) or modifying the tentacles into thin filaments (as in vampire squid).
The fourth, ventral pair is slightly shorter. Suckers are small, widely separated, and in a single series. Male glass octopuses have a hectocotlylized third left arm. This refers to when the male is ready to mate with a female, the arm can detach and release sperm to impregnate the female octopus.