The largest and most familiar crustaceans belong to Decapoda. The 10,000 species of crabs, shrimps, crayfishes, lobsters, and their relatives are decapods. The first three segments of the decapod thorax are fused with the head to form a cephalothorax and their appendages are maxillipeds. The remaining five pairs of thoracic appendages bear simple or chelate walking legs.
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- Field Guide to Kenyan Mangroves An introduction to flora and fauna of mangrove habitats in Kenya, with a focus on crabs.
- Crayfish Photo Gallery Images of dozens of species, mainly from the central United States.
- Ray Bauer Research: Marine Biology and Shrimps Research projects by Bauer and students on caridean and penaeid shrimps and other decapod crustaceans, emphasizing mating systems, breeding, hermaphroditism, coloration, grooming, fouling, seagrass fauna, publications.
- Red Crab - Gecarcoidea natalis Description, bulletins, diet, habitat, breeding, migration, and human impact on the most populous crab species on Christmas Island.
- Asian Shore Crab - Hemigrapus sanguineus Profile of this species, which is becoming established on the east coast of the US. Includes photos and maps.
- Wikipedia: Decapoda Encyclopedia article covering the order, with details of anatomy, classification, and photos of sample species.
- Land Crabs in the Bahamas. Rod Attrill’s article outlines the strange life of Cardisoma guanhumi, and the mosquito and fish that share its burrow.
- The Red Mangrove-tree Crab Photographic study of this crustacean by Hugh Mitchell-Tapping with close-ups of various appendages and information and photographs of developing larvae.
- Yeti Crab: Kiwa hirsuta Information and a photograph of this crustacean discovered living in hydrothermal vents deep in the Pacific Ocean in 2005.
- Whiteleg Shrimp Information from Wikipedia on Litopenaeus vannamei from the Eastern Pacific, a species widely grown in shrimp farms for use as food.
- Penaeus setiferus: White Shrimp Photograph of this species and information on its taxonomy, description, habitat and distribution, life history, population biology, physical tolerances and ecology.
- Cardisoma guanhumi: Blue Land Crab Photograph of this species and information on its taxonomy, description, habitat and distribution, life history, population biology, physical tolerances and ecology.
- Panulirus argus: Spiny Lobster Photograph of this species and information on its taxonomy, description, habitat and distribution, life history, population biology, physical tolerances and ecology.
- Penaeus aztecus: Brown Shrimp Photograph of this species and information on its taxonomy, description, habitat and distribution, life history, population biology, physical tolerances and ecology.
- Penaeus duorarum: Pink Shrimp Photograph of this species and information on its taxonomy, description, habitat and distribution, life history, population biology, physical tolerances and ecology.
- Petrolisthes armatus: Green Porcelain Crab Photograph of this species and information on its taxonomy, description, habitat and distribution, life history, population biology, physical tolerances, ecology and invasive information.
- Callinectes sapidus: Blue Crab Photograph of this species and information on its taxonomy, description, habitat and distribution, life history, population biology, physical tolerances and ecology.
- Charybdis hellerii: Indo-Pacific Swimming Crab Photograph of this species and information on its taxonomy, description, habitat and distribution, life history, population biology, physical tolerances and ecology.
- Sicyonia brevirostris: Brown Rock Shrimp Photograph of this species and information on its taxonomy, description, habitat and distribution, life history, population biology, physical tolerances and ecology.
- Long-clawed Hermit Crab Photograph and description of Pagurus longicarpus.
- Flat-clawed Hermit Crab Photograph and description of Pagurus pollicaris.
- Fiddler Crabs (Genus Uca) Much information on these crabs, their classification, systematics, phylogeny, morphology, life cycle and range.
- Krill Information from Wikipedia on these minute crustaceans that form an important part of the food chain for many larger animals.
- Prawns and Shrimps Photographs and information on species found round the coasts of Britain, with help in distinguishing a prawn from a shrimp.
- Common Hermit Crab Several photographs of Pagurus berhardus with information on its identification, breeding, habitat, food, range and bionomics.
- Spiny Spider Crab: Maja squinado Photograph of a well-camouflaged crab and an article by Peter Glanvill on the behavior of this species. Also other photographs and accounts of sightings round the coasts of Britain.
- Shore Crab Several photographs of Carcinus maenas with information on its identification, breeding, habitat, food, range and bionomics.
- Edible Crab Several photographs of the edible or brown crab, Cancer pagurus, and its discarded exoskeleton.
- Hairy Crab Several photographs of this crab, Pilumnus hirtellus, which is characterised by unequal sized claws.
- Long-legged Spider Crab Several photographs of this crab, Macropodia rostrata.
- Red King Crab Research project by Sarah Luchsinger on Paralithodes camtschatica, including its classification, habitat, adaptation, nutrition, reproduction and interactions with other species.
- Scylla serrata Taxonomy and description of the serrated swimming crab, its habitat and distribution, life history, physical tolerances, community ecology and invasion information.
- Decorator Crabs Information and photographs of brachyuran crabs in the superfamily Majoidea that have the unusual habit of decorating their carapace with bits of algae and invertebrates.
- Crabs Photographs and information on the species found round the coasts of Britain.
- Crustacea Extensive information on the crabs, lobsters and shrimps found in the waters round Britain.
- Blue Crab Archives Provides a great deal of information on Callinectes sapidus, their identification, biology, how they are caught, how to eat them, crab news and a forum.
- The American Lobster: Homarus americanus Research project by Whitney Hill at the University of Wisconsin-LaCrosse.
- Cancer magister: Dungeness Crab Research project by Wesley Luchterhand at the University of Wisconsin-LaCrosse.
- Kiwa hirsuta: The Yeti Crab Research project by Rourke Decker at the University of Wisconsin-LaCrosse.
- The White Shrimp: Penaeus setiferus Research project by Hannah Stofflet at the University of Wisconsin-LaCrosse.
- Decapod Crabs A useful guide to Australian crabs and their biology, providing for each species a description and details of distribution, habitat and biology.
- Anomurans Provides information on the false crabs and hermit crabs in this infraorder, their biology and distribution.
- Kiwa Hirsuta Provides information on this deep sea species, first discovered in 2001, its discovery, appearance, habitat and nutrition.
- Dominance in Crayfish. Article from the Journal of Neuroscience on patterns of behavior, including the activation of neural circuits, during the formation of a dominance hierarchy in crayfish.
- Coconut Crab: Birgus latro Photographs and information from ARKive including description, range, habitat, biology, threats and conservation.
- Yabbie Crayfish: Cherax destructor Photographs and information from ARKive including description, range, habitat, biology, threats and conservation.
- Giant Freshwater Crayfish: Astacopsis gouldi Information from ARKive on this rare Australian species.
- Common Prawn: Palaemon serratus Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- Masked Crab: Corystes cassivelaunus Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- Edible Crab: Cancer pagurus Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- Velvet Swimming Crab: Necora puber Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- Common Hermit Crab: Pagurus bernhardus Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- Common Shore Crab: Carcinus maenas Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- Sterrer’s Cave Shrimp: Parhippolyte sterreri Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- Blue Crab Information on this crustacean, Callinectes sapidus, its life cycle and habitat.
- The Lobster Institute A cooperative program of research and education with the lobster industry at the University of Maine. Information generated through the Institute about the American lobster (Homarus americanus) is intended to help conserve and enhance the resource, thereby ensuring the continuance of a strong and healthy industry in the state and the region.