26 articles
Calappa (crab)
Calappa is a genus of box crabs (family Calappidae, type species Cancer granulatus) with a broad carapace, folded legs, and shell-opening right claws, found in Atlantic, Indian, and Pacific waters from 0 to 1000 m.
Calappidae
Calappidae, the box crabs (De Haan, 1833), is a brachyuran crab family in Calappoidea with nine extant genera including Calappa and Mursia, two major clades, a deep-water origin, and an extensive fossil record.
Callichimaera
Callichimaera perplexa, the platypus of crabs, is a 95-90 million-year-old fossil true crab from Colombia and Wyoming with larval-like adult traits, huge eyes, and oar-like swimming legs.
Callinectes danae
Callinectes danae (Dana swimming crab, cangrejo sirí, siri-da-maré) is a portunid swimming crab described by S. I. Smith in 1869, ranging from southern Florida to Santa Catarina, Brazil, living in estuaries to 75 m depth and fished artisanally.
Callinectes sapidus
Callinectes sapidus, the Atlantic blue crab, is a portunid swimming crab native from Nova Scotia to Argentina, prized in Chesapeake Bay fisheries and invasive across the Mediterranean and Black Seas.
Cancer borealis
Cancer borealis, the Jonah crab, is a crab in the family Cancridae living on the Atlantic coast of North America, where it supports a commercial fishery.
Cancer pagurus
Cancer pagurus, the edible or brown crab, a large cancrid crab of the northeast Atlantic from Morocco to Norway, common at 6–40 m, supporting Europe's most important edible crab fishery, worth ~£37M in the UK in 2020.
Carcinus maenas
Carcinus maenas, the European green crab or shore crab, is a portunid crab native to Atlantic Europe and North Africa, now among the IUCN's 100 worst invasive species, preying on bivalves and competing with native crabs on every temperate continent.
Chinese mitten crab (中华绒螯蟹)
Chinese mitten crab (中华绒螯蟹, Eriocheir sinensis, dazhaxie), a catadromous burrowing crab native to Yellow Sea rivers in China and Korea, farmed as a delicacy in China and an IUCN top-100 invasive species in Europe and North America.
Chionoecetes bairdi
Chionoecetes bairdi, the southern Tanner crab (Rathbun, 1924), is a shelf-dwelling true crab of the eastern North Pacific and Bering Sea, harvested commercially in Alaska since 1961, marketed as snow crab, and able to hybridize with C. opilio.
Chionoecetes opilio
Chionoecetes opilio, snow crab or queen crab (Cancer opilio, Fabricius 1788), a cold-water Oregoniidae crab of North Pacific and North Atlantic floors; major trap fisheries in Alaska, Canada, and the Barents Sea; males to 150 mm carapace, 1.4 kg.
Christmas Island red crab
Christmas Island red crab (Gecarcoidea natalis), a large red land crab endemic to Christmas Island and Cocos Islands, famous for its annual breeding migration to the sea and threatened by invasive yellow crazy ants.
Crab
Crab (Brachyura): true crabs, about 7,000 species in 98 families, sister to Anomura false crabs; Jurassic origin about 180 Ma, Cretaceous radiation, freshwater crabs with two independent origins, carcinization, and major fisheries.
Crab anatomy
Crab anatomy covers the structure of true crabs: a broad carapace over the cephalothorax, a reduced abdomen folded underneath, five walking leg pairs, and claws used for feeding and defense.
Crab life cycle
The crab life cycle runs from an egg mass carried on the mother's abdomen through planktonic zoea and megalopa larvae to a juvenile that grows by molting.
Cyclida
Cyclida (cyclidans, "sea ticks") is an extinct order of Multicrustacea crustaceans with a rounded carapace covering the body, known from the Early Carboniferous to Late Cretaceous, with 52 reviewed species in six families from marine, brackish, and freshwater habitats.
Dungeness crab
Dungeness crab (Metacarcinus magister, Cancer magister) is a large edible west coast North American crab from Alaska to California, basis of a 3S-managed fishery worth over $200 million annually.
Fiddler crab
Fiddler crabs (Ocypodidae, formerly genus Uca) are small semi-terrestrial crabs of world mudflats and salt marshes; males wave one enlarged claw, up to half body weight, to court females and fight rivals, while all crabs dig burrows used for shelter, breeding, and hibernation.
Florida stone crab
Florida stone crab (Menippe mercenaria), a Gulf and Atlantic crab harvested claw-only in Florida, which supplies 99% of U.S. landings; season October 15–May 1, minimum claw 2 7/8 inches, claws regenerate after molting.
Ghost crab
Ghost crab (Ocypode, Atlantic ghost crab Ocypode quadrata): pale nocturnal burrowing crab of tropical and subtropical sandy beaches; 21 species; runs up to 10 mph; apex beach invertebrate predator and widely used bioindicator of human beach impacts.
Haberma tingkok
Haberma tingkok (汀角攀树蟹), Ting Kok Tree Climbing Crab, is a sesarmid micro-mangrove crab described in 2017 from Hong Kong, the only known arboreal Haberma species, climbing Kandelia obovata mangroves at 1.5–1.8 m and recorded only from Tolo Harbour.
Japanese spider crab
Japanese spider crab (Macrocheira kaempferi, Takaashigani): marine crab off Pacific Japan with the longest leg span of any arthropod, up to about 3.7–4 m, weighing up to 19 kg, living 50–600 m deep.
Portunus pelagicus
Portunus pelagicus, the blue swimming crab or flower crab, is an Indo-Pacific portunid crab from sandy and seagrass shallows to 50 m; a major export fishery, split by Lai et al. 2010 into four species including P. armatus and P. segnis.
Portunus trituberculatus
Portunus trituberculatus, Gazami crab (ガザミ), a portunid swimming crab of East Asian waters; supports the world's largest crab fishery, over 540,000 tons annually, and is widely farmed in China.
Scylla serrata
Scylla serrata, the giant mud crab or mangrove crab, is a large Indo-West Pacific portunid crab of estuaries and mangroves; one of four Scylla species, it supports valuable fisheries and aquaculture exceeding 230,000 t annually.
Spider crab
Spider crabs are crabs of the superfamily Majoidea, defined by long, slender legs on a small carapace, and many species camouflage themselves with algae, sponges, and other living material.