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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]
The two-part beak of the giant squid, Architeuthis sp. All living cephalopods have a two-part beak; [12]: 7 most have a radula, although it is reduced in most octopus and absent altogether in Spirula. [12]: 7 [98]: 110 They feed by capturing prey with their tentacles, drawing it into their mouth and taking bites from it. [25]
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 glass squid from the family Cranchiidae is nearly transparent with the exception of a few body parts, such as its eyes. When predators look down from below, they are searching the water for ...
Squid are also known to be sensitive to temperature, salinity, and circulation in the water. [10] These habitat components can affect reproduction and life cycles. Chinese spear squid at different growth stages sometimes have different names among fishermen: they call the larvae of squid "small rolls", and the sub-adults are called "middle ...
The beak of a giant squid. All extant cephalopods have a two-part beak, or rostrum, situated in the buccal mass and surrounded by the muscular head appendages. The dorsal (upper) mandible fits into the ventral (lower) mandible and together they function in a scissor-like fashion. [1] [2] The beak may also be referred to as the mandibles or jaws ...
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 ]
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 ...