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Cephalopod limbs bear numerous suckers along their ventral surface as in octopus, squid and cuttlefish arms and in clusters at the ends of the tentacles (if present), as in squid and cuttlefish. [9] Each sucker is usually circular and bowl-like and has two distinct parts: an outer shallow cavity called an infundibulum and a central hollow ...
The shape of the tip of the hectocotylus has been much used in octopus systematics. Many coleoids lack hectocotyli altogether. [6] Among Decapodiformes (ten-limbed cephalopods), generally either one or both of arms IV are hectocotylized. In incirrate octopuses, it is one of arm pair III. [6]
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. [citation ...
A cephalopod / ˈ s ɛ f ə l ə p ɒ d / is any member of the molluscan class Cephalopoda / s ɛ f ə ˈ l ɒ p ə d ə / (Greek plural κεφαλόποδες, kephalópodes; "head-feet") [3] such as a squid, octopus, cuttlefish, or nautilus.
Henry the Hexapus was a six-limbed lesser octopus found by British marine scientists in 2008. [1] [2] The name alludes to King Henry VIII, who had six wives. [3] While the name Hexapus is descriptive, Henry the Hexapus should not be confused with Hexapus, a recognized genus of crabs.
During reproduction, the male octopus deposits a spermatophore (or sperm packet) more than 1 m (3.3 ft) long using his hectocotylus (specialized arm) in the female's mantle. The hectocotylus is found on the third arm of male octopuses and occupies the last four inches of the arm. [39] This part of the male arm anatomy contains no suckers.
East Pacific red octopus, rescued from a gull near Los Osos, California. Octopus rubescens (commonly the East Pacific red octopus which is a Cephalopod, and also known as the ruby octopus, a preferred common name due to the abundance of octopus species colloquially known as red octopus [1]) is the most commonly occurring shallow-water octopus on much of the North American West Coast and a ...
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).