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Astacidae
Astacidae is a family (biology), family of freshwater crayfish native to Europe, western Asia and western North America. The family is made up of four extant taxon, extant (living) genera: The genera ''Astacus'' (which includes the European crayfish), ''Pontastacus'' (which includes the Turkish crayfish), and ''Austropotamobius'' are all found throughout Europe and parts of western Asia, while ''Pacifastacus'' (which includes the signal crayfish) is native to western United States and British Columbia, but has also been Introduced species, introduced elsewhere. Classification and phylogeny Astacidae belongs to the superfamily (biology), superfamily Astacoidea, which contains all crayfish in the Northern Hemisphere. Astacoidea is the sister taxon to Parastacoidea, which contains all crayfish of the Southern Hemisphere. Crayfish and lobsters together comprise the infraorder Astacidea, as shown in the simplified cladogram below: The internal phylogeny of Astacidae can be further sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astacus
''Astacus'' (from the Ancient Greek, Greek , ', meaning "lobster" or "crayfish") is a genus of crayfish found in Europe, comprising three Extant taxon, extant (living) species and three somewhat contested extinct species. These crayfish are found across Europe and live exclusively in freshwater, mostly inhabiting the bottom of lakes, ponds, and streams. Due to the crayfish plague, crayfish of this genus have declined in many European regions, being replaced by the invasive species, invasive North American signal crayfish, which carries the plague but is unaffected by it. Classification ''Astacus'' was the first named genus of freshwater crayfish, with many former species later being reassigned to other genera. ''Astacus'' belongs to the family (biology), family Astacidae, one of the three families of Northern Hemisphere freshwater crayfish within the superfamily (biology), superfamily Astacoidea. The internal phylogeny of Astacidae can be shown in the cladogram below: Extant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
