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Gladius, showing measurement of rachis and vane. The gladius (pl.: gladii), or pen, is a hard internal bodypart found in many cephalopods of the superorder Decapodiformes (particularly squids) and in a single extant member of the Octopodiformes, the vampire squid (Vampyroteuthis infernalis). [1]
Some male squids, mainly deep-water species, have instead evolved a penis longer than their own body length, the longest penis in any free-living animals. It is assumed these males simply attach a spermatophore anywhere on a female's body. [115] An indication of sexual maturity of females is the development of brachial photophores to attract mates.
Histioteuthis heteropsis, known as the strawberry squid, is a species of small cock-eyed squid. [2] The scientific nomenclature of these squid stems from their set of differently sized eyes, one being small and blue and the other being large and yellow.
The squid's two feeding tentacles have suckers on them with toothed rims. [7] Sepioloidea lineolata also have glands underneath their body that can secrete a toxic slime whenever the squid is being attacked by a predator. [8] The slime scares off the predators or allows the striped pyjama squid enough time to escape.
Cephalopods exhibit various dermal structures on their mantles and other parts. These may take the form of conspicuous warts, cushions, papillae or scales, though in many species they are microscopic tubercles. [4] The most elaborate forms are found among the oceanic squid of the order Teuthida. [1] [5]
Some older fossils have been described from the Devonian, [4] but paleontologists disagree about whether they are coleoids. [5] Other cephalopods with internal shells, which could represent coleoids but may also denote the independent internalization of the shell, are known from the Silurian . [ 6 ]
Squid (Korean: 오징어, ojingŏ) is a children's game played in South Korea. The game is named as such because the shape of the playing field drawn on the ground resembles that of a squid . There are regional variations of the name such as "squid gaisan " (with gaisan thought to be a variation of the Japanese word kaisen 開戦 , 'to start a ...
Little is known about the reproductive cycle of armhook squid. Most squid species whose reproduction has been observed have been seen to deposit eggs on the sea floor, then leave the eggs to hatch on their own. Five female Gonatus onyx squids have been observed in Monterey Canyon dragging a membrane sack containing 2,000 to 3,000 developing ...