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Cuttlebone, also known as cuttlefish bone, is a hard, brittle internal structure (an internal shell) found in all members of the family Sepiidae, commonly known as cuttlefish, within the cephalopods. In other cephalopod families it is called a gladius .
It is so named for its superficial resemblance to the Roman short sword of the same name, and is a vestige of the ancestral mollusc shell, which was external. [1] The gladius is located dorsally within the mantle and usually extends for its entire length. Composed primarily of chitin, it lies within the shell sac, which is responsible for its ...
Color change is widespread in ectotherms including anoles, frogs, mollusks, many fish, insects, and spiders. [49] The mechanism behind this color change can be either morphological or physiological. Morphological change is the result of a change in the density of pigment containing cells and tends to change over longer periods of time.
The gastropod shell is part of the body of many gastropods, including snails, a kind of mollusc. The shell is an exoskeleton , which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage.
The body of a mollusc has a ventral muscular foot, which is adapted to different purposes (locomotion, grasping the substratum, burrowing or feeding) in different classes. [36] The foot carries a pair of statocysts, which act as balance sensors. In gastropods, it secretes mucus as a lubricant to aid movement.
Cuttlefish, or cuttles, are marine molluscs of the suborder Sepiina.They belong to the class Cephalopoda which also includes squid, octopuses, and nautiluses.Cuttlefish have a unique internal shell, the cuttlebone, which is used for control of buoyancy.
Sepia apama Sepia elegans Sepia latimanus Sepia officinalis Sepia pharaonis Sepia prashadi Sepia sp.. Sepia is a genus of cuttlefish in the family Sepiidae encompassing some of the best known and most common species.
The Coleoidea, a subclass of cephalopod molluscs who evolved internalised shell, do not have a true endoskeleton in the physiological sense; there, the internal shell has evolved into a buoyancy organ called the gladius or cuttlebone, which may provide muscle attachment but does not support the cephalopod's body shape (which is maintained ...