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Decapoda


'Decapoda' can also refer to...

Decapoda

Decapoda

Decapoda

Decapoda

Decapoda

Crustacea: Decapoda

Biology and abundance of Cancer bellianus (Decapoda, Brachyura) around the Azores

Phyllosoma larvae (Decapoda: Palinuridea) of the Cape Verde Islands

Larval development of Crangon hakodatei Rathbun (Decapoda: Crangonidae) reared in the laboratory

Larval development of Hexapanopeus caribbaeus (Stimpson, 1871) (Crustacea, Decapoda, Xanthoidea, Panopeidae) reared under laboratory conditions

Larval and postlarval development of Pisa tetraodon (Pennant, 1777) (Decapoda: Majidae) reared in the laboratory

Species of Decapoda (Crustacea) in the Fossil Record: Patterns, Problems, and Progress

Dispersal of Munida gregaria (Decapoda: Galatheidae) larvae in Patagonian channels of southern Chile

Evolutionary History of True Crabs (Crustacea: Decapoda: Brachyura) and the Origin of Freshwater Crabs

Correct diagnosis of early zoeal stages of Athanas nitescens (Leach, 1814) (Decapoda, Caridea, Alpheidae) using laboratory-raised larvae

Facultative secondary lecithotrophy in the megalopa of the shrimp Lysmata seticaudata (Risso, 1816) (Decapoda: Hippolytidae) under laboratory conditions

The larvae of the spider crab Pisoides bidentatus (A. Milne-Edwards, 1873) (Decapoda: Majoidea: Pisidae) reared under laboratory conditions

Larval development of Philocheras fasciatus (Risso, 1816) (Decapoda, Caridea) reared in the laboratory, comparison with plankton larvae and occurrence of accelerated development

Larval development of the Australian giant crab Pseudocarcinus gigas (Lamarck, 1818) (Decapoda: Oziidae) reared in the laboratory

 

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; subphylum Crustacea, class Malacostraca)

Order of crustaceans, most of which are marine, but some of which inhabit freshwater or terrestrial habitats, or are amphibious. The first three pairs of thoracic appendages are modified; and the remaining five pairs, from which the order derives its name (from the Greek deka, ‘ten’, and pod-, ‘foot’) are legs. The first pair of legs is usually large, heavy, and chelate (the ‘chelipeds’): these legs are used in prey capture, defence, and sexual signalling. The head and thorax are fused dorsally, lateral expansions of the carapace enclosing the gills in branchial chambers. Gills may be dendritic, filamentous, or lamellar, and ventilating currents are passed over them by means of gill bailers. The blood contains haemocyanin and flows through the lamellae of the gills. Land crabs have a reduced gill number, and so conserve water. Most decapods are predacious or scavenging (the prey including echinoderms, bivalves, polychaetes, and other crustaceans), but most freshwater and terrestrial decapods are herbivorous. There is considerable sexual dimorphism and the complex courtship displays have visual, acoustic, and pheromonal components. Fertilization is internal in the true crabs (infra-order Brachyura) but occurs at the moment of egg-laying in most others. Decapods are very diverse in form, habit, and modes of locomotion, and are very important both in the marine ecosystem and to humans, for food and by-products. The most successful members of the order are the true crabs, which have evolved a specialized, short body form, the abdomen fitting tightly under the cephalothorax, which permits rapid locomotion (1.6 m/s in Ocypode, a genus of ghost crab). Decapoda is the largest crustacean order, comprising some 8500 species, or about one-third of all known crustacean species.

Subjects: Zoology and Animal Sciences.


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