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The molted carapace of a lady crab from Long Beach, New York. In crustaceans, the carapace functions as a protective cover over the cephalothorax (i.e., the fused head and thorax, as distinct from the abdomen behind). Where it projects forward beyond the eyes, this projection is called a rostrum.
In the Anomura (hermit crabs and related animals), the fifth pair of pereiopods is often hidden inside the branchial chamber, where they are used to clean the gills. The cephalothorax is covered by a carapace which protects the internal organs and the gills; the section of the carapace that projects in front of the eyes is called the rostrum.
Younger crabs may be lighter olive-brown or reddish-brown. [3] The carapace is a badge-like shape similar to a police officer's badge or shield; hence the secondary name shield-backed crab. Its carapace is curved and smooth, with a slick texture. The front of the crab has a protrusion called a rostrum, extending the carapace and is used in ...
Some crab-shaped species have evolved away from the crab form in a process called decarcinisation. Decarcinisation, or the loss of the crab-like body, has occurred multiple times in both Brachyura and Anomura. [25] [26] However, there are varying degrees of carcinisation and decarcinisation. Thus, not all species can necessarily be distinctly ...
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]
The carapace of a Speckled swimming crab is light brown, light maroon, or olive with many white or tan irregular round spots. [6] The males tend to be more colorful. [6] The carapace can reach lengths between 4.5 and 6 inches wide (~120-150mm). [6] Each side of the carapace consists of nine lateral teeth with the last extending outward. [6]
The sheep crab has a carapace, four sets of walking legs, and a set of claws, or chelipeds.Males are larger than females. The carapace of a male can be over 9.6 inches (24 cm) across, while females can grow to 6.8 inches (17 cm). [5]
Cancer pagurus, commonly known as the edible crab or brown crab, is a species of crab found in the North Sea, North Atlantic Ocean, and perhaps the Mediterranean Sea. It is a robust crab of a reddish-brown colour, having an oval carapace with a characteristic "pie crust" edge and black tips to the claws.