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The decapod (crustaceans, such as a crab, lobster, shrimp or prawn) is made up of 20 body segments grouped into two main body parts: the cephalothorax and the pleon . [1] [2] Each segment may possess one pair of appendages, although in various groups these may be reduced or missing. They are, from head to tail:
The Decapoda or decapods (lit. ' ten-footed ') is a large order of crustaceans within the class Malacostraca, and includes crabs, lobsters, crayfish, shrimp, and prawns.Most decapods are scavengers.
A shed carapace of a lady crab, part of the hard exoskeleton Body structure of a typical crustacean – krill The body of a crustacean is composed of segments, which are grouped into three regions: the cephalon or head, [ 5 ] the pereon or thorax , [ 6 ] and the pleon or abdomen . [ 7 ]
Crab Museum claims to be Europe's first and only exhibition area dedicated to the decapod's world. ... anatomy and biodiversity.
At the time of moulting, the crab takes in a lot of water to expand and crack open the old shell at a line of weakness along the back edge of the carapace. The crab must then extract all of itself – including its legs, mouthparts, eyestalks, and even the lining of the front and back of the digestive tract – from the old shell. This is a ...
Carcinisation (American English: carcinization) is a form of convergent evolution in which non-crab crustaceans evolve a crab-like body plan. The term was introduced into evolutionary biology by Lancelot Alexander Borradaile , who described it as "the many attempts of Nature to evolve a crab".
King crabs are decapod crustaceans of the family Lithodidae [b] that are chiefly found in deep waters and are adapted to cold environments. [2] [3] They are composed of two subfamilies: Lithodinae, which tend to inhabit deep waters, are globally distributed, and comprise the majority of the family's species diversity; [3] [4] and Hapalogastrinae, which are endemic to the North Pacific and ...
Tens of millions of adults and teens in the U.S. are affected by a wide range of mental health disorders. The U.S. National Institute of Mental Health notes that some of the most common ones ...