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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]
Glass squids are of the class Cephalopoda and members of this class are gonochoric. Males perform displays to attract potential female mates. During the mating process, the male squids hold the female squids and insert the hectocotylus into the mantle cavity of the female squid. Fertilization occurs within this mantle cavity and embryos hatch ...
Squids do not have the longitudinal muscles that octopus do. Instead, they have a tunic. [81] This tunic is made of layers of collagen and it surrounds the top and the bottom of the mantle. Because they are made of collagen and not muscle, the tunics are rigid bodies that are much stronger than the muscle counterparts.
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 ...
Bigfin squids are a group of rarely seen cephalopods with a distinctive morphology.They are placed in the genus Magnapinna and family Magnapinnidae. [2] Although the family was described only from larval, paralarval, and juvenile specimens, numerous video observations of much larger squid with similar morphology are assumed to be adult specimens of the same family.
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]
These two eyes allow the strawberry squid to do a remarkable thing. It can see right through another animal’s counter-illumination camouflage. The squid does this thanks to the yellowish tint of ...
The firefly squid belongs to the Cephalopoda class and the superorder Decapodiformes, commonly known as squid. Their body consists of a distinct head and mantle, and has a bilaterally symmetrical layout. They are soft-bodied organisms with a skeletal structure composed of chitin. They have relatively large eyes, eight arms, and two tentacles.