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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 glass squid can also squirt ink into its body cavity. Scientists think this may make them even darker in the dim waters, or it may serve as a chemical deterrent to creatures trying to eat it.
The same is true of the chitinous gladius of squid [82] and octopuses. [83] Cirrate octopods have arch-shaped cartilaginous fin supports, [84] which are sometimes referred to as a "shell vestige" or "gladius". [85] The Incirrina have either a pair of rod-shaped stylets or no vestige of an internal shell, [86] and some squid also lack a gladius ...
The ink that is expelled can mimic the shape of the squid and thereby distract the predator long enough for the squid to get away, or it can interfere with the vision of the predator. [9] The striped pyjama squid has white and brown stripes all across its body. The white stripes on the squid are reflective of white light. [10]
The stubby squid is a small species growing to a maximum mantle length of about 5 cm (2.0 in) and a total length of 11 cm (4.3 in), with females being larger than males. The head bears eight short arms, a pair of retractable tentacles and two large eyes. The first pair of arms is shorter than the others and the third pair the longest.
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An ink sac is an anatomical feature that is found in many cephalopod mollusks used to produce the defensive cephalopod ink. With the exception of nocturnal and very deep water cephalopods , all Coleoidea (squid, octopus and cuttlefish) which dwell in light conditions have an ink sac, which can be used to expel a cloud of dark ink in order to ...
In a very large, deep skillet, heat 1/4 cup plus 2 tablespoons of the oil. Add the shallots and cook over moderate heat, stirring, until softened, 8 minutes.