Crustaceans Of Montana
There are at least 30 species of crustaceans found in Montana. The Montana Department of Fish, Wildlife and Parks has identified a number of crustacean species as ''Species of Concern''. Crustaceans Crustaceans (Crustacea) form a very large group of arthropods, usually treated as a subphylum, which includes such familiar animals as crabs, lobsters, crayfish, shrimp, krill and barnacles. The 50,000 described species range in size from ''Stygotantulus, 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 ecdysis, moult to grow. They are distinguished from other groups of arthropods, such as insects, Myriapoda, myriapods and Chelicerata, chelicerates by the possession of biramous (two-parted) limbs, and by the Nauplius (larva), nauplius form of the crustacean larvae, larvae. Most crustaceans are free-living aquatic animals, but some are Terrestrial animal, terrestrial (e.g ...
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Pacifastacus Leniusculus 01 By-dpc
''Pacifastacus'' is a genus of crayfish native to western North America (USA and Canada), containing six species, two of which are extinct: *†''Pacifastacus chenoderma'' (fossil: Miocene – Pliocene) *''Pacifastacus connectens'' *''Pacifastacus fortis'' – Shasta crayfish *''Pacifastacus gambelii'' *''Pacifastacus leniusculus'' – signal crayfish *†''Pacifastacus nigrescens'' – Sooty crayfish References

Astacidae Crustacean genera {{Crayfish-stub ...
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