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Cercopagididae
Cercopagididae is a family of crustaceans belonging to the order Diplostraca. Genera: * '' Blythotrephes'' Leydig, 1860 (e.g. '' Bythotrephes longimanus'' * '' Cercopagis'' Sars, 1897 (e.g. ''Cercopagis pengoi ''Cercopagis pengoi'', or the fishhook waterflea, is a species of planktonic cladoceran crustaceans that is native in the brackish fringes of the Black Sea and the Caspian Sea. In recent decades it has spread as an invasive species to some freshw ...'' In addition, * '' Apagis'' Sars, 1897 is sometimes treated as a genus rather than as a subgenus, ''Cercopagis'' (''Apagis''). References Diplostraca Crustacean families {{branchiopoda-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diplostraca
The Diplostraca or Cladocera, commonly known as water fleas, are a superorder of small crustaceans that feed on microscopic chunks of organic matter (excluding some predatory forms). Over 1000 species have been recognised so far, with many more undescribed. The oldest fossils of diplostracans date to the Jurassic, though their modern morphology suggests that they originated substantially earlier, during the Paleozoic. Some have also adapted to a life in the ocean, the only members of Branchiopoda to do so, even if several anostracans live in hypersaline lakes. Most are long, with a down-turned head with a single median compound eye, and a carapace covering the apparently unsegmented thorax and abdomen. Most species show cyclical parthenogenesis, where asexual reproduction is occasionally supplemented by sexual reproduction, which produces resting eggs that allow the species to survive harsh conditions and disperse to distant habitats. Description They are mostly long, with th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crustacean
Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean group can be treated as a subphylum under the clade Mandibulata. It is now well accepted that the hexapods emerged deep in the Crustacean group, with the completed group referred to as Pancrustacea. Some crustaceans (Remipedia, Cephalocarida, Branchiopoda) are more closely related to insects and the other hexapods than they are to certain other crustaceans. The 67,000 described species range in size from '' Stygotantulus stocki'' at , to the Japanese spider crab with a leg span of up to and a mass of . Like other arthropods, crustaceans have an exoskeleton, which they moult to grow. They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous (two-parted) limbs, and by th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bythotrephes Longimanus
''Bythotrephes longimanus'' (also ''Bythotrephes cederstroemi''), or the spiny water flea, is a planktonic crustacean less than long. It is native to fresh waters of Northern Europe and Asia, but has been accidentally introduced and widely distributed in the Great Lakes area of North America since the 1980s.''Bythotrephes longimanus'' USGS NAS – Nonindigenous Aquatic Species ''Bythotrephes'' is typified by a long abdominal spine with several barbs which protect it from predators. Description and taxonomy ''Bythotrephes longimanus'' is a crustacean (water flea) recognizable with its straight tail spine averaging about 70% of its length. Adult individuals have thre ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cercopagis Pengoi
''Cercopagis pengoi'', or the fishhook waterflea, is a species of planktonic cladoceran crustaceans that is native in the brackish fringes of the Black Sea and the Caspian Sea. In recent decades it has spread as an invasive species to some freshwater waterways and reservoirs of Eastern Europe and to the brackish Baltic Sea. Further it was introduced in ballast water to the Great Lakes of North America and a number of adjacent lakes, and has become a pest classified among the 100 worst invasive species of the world. ''Cercopagis pengoi'' is a predatory cladoceran and thus a competitor to other planktivorous invertebrates and smaller fishes. On the other hand, it has provided a new food source for planktivorous fishes. It is also a nuisance to fisheries as it tends to clog nets and fishing gear.Birnbaum, C. (2006)''Cercopagis pengoi''. NOBANIS – Invasive Alien Species Fact Sheet. Description The length of ''Cercopagis pengoi'' body is 1–3 mm, but with the tail included ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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