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Hepatus epheliticus, known by various names, including the calico crab (not to be confused with Ovalipes ocellatus) and Dolly Varden crab, is a species of crab. It lives in shallow water in the western Atlantic Ocean from the Chesapeake Bay to the Dominican Republic .
Petrolisthes eriomerus is a species of marine porcelain crab found in the eastern Pacific Ocean. It is commonly known as the flattop crab. It is a flattened, rounded animal, with a carapace up to 20 mm (0.8 in) across. It is a filter feeder, and also sweeps food from rocks.
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 L. A. Borradaile , who described it as "the many attempts of Nature to evolve a crab".
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]
Ovalipes ocellatus is commonly known as the lady crab, [a] oscellated crab, [b] or calico crab. [6] It was first described in 1799 by naturalist Johann Friedrich Wilhelm Herbst, who placed it into the genus Cancer. [1] [2] In 1898, carcinologist Mary Jane Rathbun moved the species to her new genus Ovalipes. [11]
The carapace and the exposed parts of the chelae (pincers) are a mottled greyish-brown colour, and are covered with small raised tubercles of various sizes, making the crabs well-camouflaged when semi-submerged in the sand. The chelae are large and powerful, and specially adapted to the crab's feeding behaviour, the crushing and eating of molluscs.
Neolithodes grimaldii, the porcupine crab, [2] is a species of king crab in the family Lithodidae. This large red crab is found in cold deep waters in the North Atlantic and often caught as a bycatch in fisheries for Greenland turbot (Greenland halibut). As suggested by its common name, the carapace and legs are covered in long spines. [3]
Maguimithrax spinosissimus has a reddish-brown carapace and walking legs. The claws are smooth, purplish gray, with a single row of nodules along the outer edge, and blunt claw tips. The legs are covered with numerous short spines and nodules. It is the largest native crab species of the Atlantic.