Crayfish

Guides

Astacidae
Astacid Crayfishes, Freshwater Crayfish
Astacidae is a family of freshwater crayfish comprising four extant genera: Astacus, Austropotamobius, Pontastacus, and Pacifastacus. Members are native to Europe, western Asia, and western North America. The family is distinguished by a gonopore positioned on the coxa of the third pair of walking legs in males (fifth pair in females), a trait shared with all Astacoidea. Several species, particularly Pacifastacus leniusculus (signal crayfish), have become invasive outside their native ranges, carrying crayfish plague (Aphanomyces astaci) that threatens native European populations.
crayfish freshwater decapod invasive-species crayfish-plague ecosystem-engineer conservation commercial-fishery Europe North-America western-Asia keystone-species nocturnal burrowing rheophilic EU-Habitats-Directive
Cambaridae
Cambarid Crayfishes
Cambaridae is the largest family of freshwater crayfish, comprising over 400 species. The family is predominantly native to eastern North America and Mexico, with a small number of species in eastern Asia (genus Cambaroides) and the Caribbean (Cuba). Several species have become invasive outside their native ranges, while many others have restricted distributions and are threatened with extinction.
crayfish freshwater cave-fauna invasive-species groundwater-indicator
Cambarus asperimanus
mitten crayfish
Cambarus asperimanus, commonly known as the mitten crayfish, is a species of freshwater crayfish in the family Cambaridae. It was first described by Faxon in 1914 and is native to North America. The species holds a Least Concern conservation status according to the IUCN, last reviewed in 2010.
crayfish freshwater decapod Cambaridae North-America Least-Concern
Cambarus bartonii
common crayfish, Appalachian brook crayfish, Eastern Crayfish
Cambarus bartonii is a freshwater crayfish native to eastern North America, first described from North America in 1798. It inhabits fast-flowing, cool, rocky streams and shallow lakes across a broad range from Ontario and New Brunswick south to Alabama. The species exhibits notable physiological tolerance to acidic conditions and demonstrates behavioral flexibility, including documented use of terrestrial microhabitats for overwintering. Several subspecies have been proposed but their validity remains under investigation.
crayfish freshwater Appalachian secondary-burrower acid-tolerant terrestrial-overwintering agonistic-behavior chemosensory IUCN-Least-Concern
Cambarus bartonii bartonii
Common Crayfish
Cambarus bartonii bartonii is a subspecies of freshwater crayfish native to eastern North America. It is a secondary burrowing species found in streams and other aquatic habitats, with documented physiological tolerance to acidic conditions. The subspecies exhibits agonistic behavioral contests between males, particularly during reproductive periods when males adopt Form I morphology with enlarged claws. It has been observed using terrestrial microhabitats for overwintering.
crayfish freshwater Appalachian secondary-burrower acid-tolerance agonistic-behavior terrestrial-overwintering
Cambarus dubius
Upland Burrowing Crayfish
Cambarus dubius, commonly known as the Upland Burrowing Crayfish, is a burrowing crayfish species native to the central and southern Appalachian region of the eastern United States. The species has a complex taxonomic history with multiple distinct color phases historically recognized across different geographic areas. Recent taxonomic work has restricted C. dubius sensu stricto to populations with orange dorsal and lateral coloration and cream ventral surfaces, found in the central and northern Allegheny Mountains and high elevations of the Appalachian Plateau. The species constructs distinctive burrow systems and faces conservation concerns due to limited distribution data and habitat alterations.
crayfish burrowing-crayfish Appalachian-fauna species-complex conservation groundwater-indicator Cambaridae Decapoda crustacean endemic North-America United-States West-Virginia Pennsylvania Maryland terrestrial-crayfish primary-burrower
Cambarus robustus
Big Water Crayfish, robust crayfish
Cambarus robustus, commonly known as the Big Water Crayfish or robust crayfish, is a freshwater crayfish species in the family Cambaridae. It is native to eastern North America, ranging from several U.S. states to Ontario, Canada. The species has been studied extensively as a surrogate for federally endangered crayfish species due to its close phylogenetic relationships and similar ecological requirements. Research indicates it demonstrates significant acid tolerance compared to sympatric Orconectes species, exhibits complex agonistic behaviors with distinct initiation acts predicting contest outcomes, and occupies a partitioned trophic position in multi-species crayfish communities.
crayfish freshwater surrogate-species conservation ecosystem-engineer acid-tolerance agonistic-behavior trophic-partitioning Cambaridae North-America
Cambarus speciosus
Beautiful Crayfish
Cambarus speciosus, commonly known as the beautiful crayfish, is a species of freshwater crayfish in the family Cambaridae. It is endemic to Georgia, United States. The species is currently listed as Near Threatened (NT) by the IUCN, with a stable population as of the last review in 2010. The specific epithet 'speciosus' refers to its attractive appearance.
crayfish crustacean freshwater endemic Georgia USA Near-Threatened IUCN-NT Cambaridae decapod
Faxonius immunis
papershell crayfish
Orconectes immunis, commonly known as the papershell crayfish, is a freshwater crayfish native to central North America that has become invasive in parts of Canada. The species has been documented in southwestern Ontario and Lake of the Woods, where it shows preferences for shallow waters with fine substrates and aquatic vegetation. Reproductive studies indicate significant egg mortality during incubation, with females exhibiting size-dependent fecundity. The species has been subject to cellular-level studies of oogenesis, demonstrating intracellular yolk synthesis in oocytes.
crayfish invasive-species freshwater North-America reproduction oogenesis
Faxonius luteus
Golden Crayfish
Faxonius luteus, commonly known as the Golden Crayfish, is a freshwater crustacean in the family Cambaridae. It is native to North America, with documented presence in the United States. The species was first described by Creaser in 1933. Like other members of the genus Faxonius, it inhabits freshwater environments. The specific epithet "luteus" refers to its golden or yellowish coloration.
crayfish freshwater crustacean North-America Cambaridae Decapoda
Faxonius palmeri
Gray-speckled Crayfish
Faxonius palmeri is a freshwater crayfish in the family Cambaridae, commonly known as the Gray-speckled Crayfish. It was originally described as Cambarus palmeri by Faxon in 1884 and later transferred to the genus Faxonius. The species is native to North America, with documented occurrences in the United States.
crustacean crayfish freshwater North-America Cambaridae Faxonius
Faxonius virilis
Northern Crayfish, Virile Crayfish
Orconectes virilis is a medium-sized freshwater crayfish native to North America, widely distributed across Canada and the northern United States. The species is notable for its well-documented behavioral ecology, including complex social hierarchies, territorial home range behavior, and sophisticated predator avoidance mechanisms. It has been extensively studied as a model organism for agonistic behavior, chemical communication, and escape response mechanics. The species is currently expanding its range westward into Alberta and shows adaptability to varying environmental conditions, though acidification poses reproductive challenges.
crayfish freshwater decapod behavioral-ecology chemical-communication agonistic-behavior model-organism North-America range-expansion acidification-sensitivity
Lacunicambarus diogenes
devil crayfish, devil crawfish
Lacunicambarus diogenes, commonly known as the devil crayfish or devil crawfish, is a primary burrowing crayfish native to eastern North America. This species constructs and inhabits burrows in wet, muddy terrestrial habitats rather than living in permanent surface water. Its burrowing activities create refugia used by numerous other species, including documented use by eastern cicada killer wasps (Sphecius speciosus) as brooding habitat. The species ranges across the Atlantic Coastal Plain and Piedmont ecoregion from New Jersey to Georgia, with disjunct populations in Louisiana.
crayfish burrowing ecosystem-engineer primary-burrower Atlantic-Coastal-Plain terrestrial fossorial North-America Cambaridae Decapoda crustacean endemic wetland floodplain refugia allogenic-engineer cave-crayfish Lacunicambarus Cambarus Girard-1852 devil-crayfish devil-crawfish Sphecius-speciosus cicada-killer-wasp brooding-habitat soil-type congeneric-cues floodplain-connectivity muddy-substrate desiccation-refuge predation-refuge intermittent-water Piedmont New-Jersey Pennsylvania Delaware Maryland Virginia North-Carolina South-Carolina Georgia Louisiana roadside-ditch terrestrial-habitat burrow-construction burrow-maintenance wetland-engineer crustacean-ecology decapod astacidea freshwater-invertebrate invertebrate-engineer habitat-modification species-interactions commensalism facilitation ecosystem-services biodiversity-support habitat-provision microhabitat-creation soil-bioturbation sediment-mixing water-infiltration groundwater-connection ephemeral-water seasonal-wetland 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Lacunicambarus polychromatus
Paintedhand Mudbug
A primary burrowing crayfish commonly known as the Paintedhand Mudbug. Formerly classified under Cambarus but now placed in Lacunicambarus. The species constructs burrows in terrestrial habitats and has been the subject of life history studies, though detailed ecological data remain limited.
crayfish burrowing primary-burrower Cambaridae Lacunicambarus North-America
Orconectes erichsonianus
Erichson's Crayfish
Orconectes erichsonianus is a freshwater crayfish species described by Faxon in 1898, currently classified under the genus Faxonius. The species has been treated as a synonym in modern taxonomic revisions, with its current accepted name being Faxonius erichsonianus. It belongs to the family Cambaridae, a diverse group of North American crayfishes. The species is part of the complex taxonomic history of the genus Orconectes, which has undergone substantial revision based on molecular phylogenetics.
crayfish freshwater North-America Cambaridae Decapoda synonym taxonomic-revision
Orconectes limosus
spiny-cheek crayfish
Orconectes limosus, commonly known as the spiny-cheek crayfish, is a freshwater crayfish native to North America that has become a widespread invasive species in Europe. First recorded in Belarus in 1997, it has demonstrated rapid upstream dispersal, spreading 177 km along the Neman River over 14 years. The species is now established in at least 8 river systems across the Neman, Narew and Western Bug basins. Surveys indicate potential competitive displacement of native crayfish species, as no native crayfish have been found co-occurring with O. limosus in invaded areas. The species exhibits notable social behaviors including mother-offspring recognition and kin-preferential interactions.
invasive-species crayfish freshwater Europe competitive-displacement upstream-migration kin-recognition
Orconectes maletae
crayfish Decapoda Cambaridae North-America synonym Faxonius-maletae
Orconectes obscurus
Orconectes obscurus is a freshwater crayfish species originally described by Hagen in 1870. It is currently classified as a synonym of Faxonius obscurus following taxonomic revision that transferred species from Orconectes to Faxonius. The species occurs in North America, with distribution records from Canada. Limited specific ecological information is available in the provided sources.
crayfish freshwater decapod Cambaridae North-America synonym taxonomic-revision
Orconectes propinquus
Northern Clearwater Crayfish
Orconectes propinquus, commonly known as the Northern Clearwater Crayfish, is a freshwater crayfish species in the family Cambaridae. It is native to northern North American clearwater habitats and has been the subject of ecological and physiological research comparing it to other crayfish species. The species shows specific habitat preferences for water depth, velocity, substrate type, and cover availability. It is sensitive to low pH conditions compared to some co-occurring crayfish species.
crayfish freshwater clearwater Cambaridae Decapoda North-America Ontario Vermont pH-sensitive habitat-suitability
Orconectes validus
Orconectes validus is a species of freshwater crayfish in the family Cambaridae. The name is currently treated as a synonym of Faxonius validus. Original description dates to 1914 by Faxon. As a synonym, biological information specific to this nominal taxon is limited and may be conflated with the accepted name.
crayfish freshwater decapod cambaridae synonym north-america
Pacifastacus
Pacific Crayfish
Pacifastacus is a genus of freshwater crayfish endemic to western North America, comprising six species including the widespread signal crayfish (P. leniusculus) and two extinct species. The genus has gained significant conservation attention due to the invasive spread of P. leniusculus in Europe and Japan, where it transmits crayfish plague and displaces native species. Within its native range, several Pacifastacus species face population declines from habitat degradation and competition from invasive crayfishes.
crayfish freshwater invasive-species crayfish-plague western-North-America conservation Astacidae
Pacifastacus gambelli
Pacifastacus gambelli is a species of crayfish in the family Astacidae. The genus Pacifastacus is native to western North America, with species distributed across freshwater habitats in the Pacific Northwest and Rocky Mountain regions. P. gambelli is closely related to other Pacifastacus species including the widely studied signal crayfish (P. leniusculus), which has become a notorious invasive species in Europe. The species epithet 'gambelli' honors William Gambel, an American naturalist and explorer of the western United States in the 19th century.
crayfish freshwater Astacidae western-North-America Pacifastacus decapod crustacean William-Gambel
Procambarus
crayfish, crawfish, crawdad
Procambarus is a genus of freshwater crayfish in the family Cambaridae, native to North and Central America. The genus contains approximately 160 species in 16 subgenera, making it one of the most species-rich crayfish genera. It includes both widespread surface-dwelling species and numerous troglobitic (cave-dwelling) species. The marbled crayfish (marmorkrebs), a parthenogenetic form, is also classified within this genus. Several species, particularly P. clarkii (red swamp crayfish), have been introduced globally and are recognized as invasive species with significant ecological and economic impacts.
crayfish freshwater invasive troglobitic cave-dwelling commercially-harvested aquaculture North-America Central-America parthenogenesis marmorkrebs
Procambarus acutus
White River Crayfish
Procambarus acutus, commonly known as the white river crayfish, is a freshwater crayfish species in the family Cambaridae native to eastern North America. The species exhibits a disjunct native distribution spanning from the Atlantic Slope to the Gulf of Mexico drainages. It has been introduced to multiple regions outside its native range, including parts of Europe and Africa, where it poses potential ecological and economic risks. Two subspecies are recognized: P. a. acutus and P. a. cuevachicae.
crayfish decapod freshwater invasive-species North-America dominance-hierarchy tetrodotoxin-resistance aquaculture fisheries-impact Belgium Canada Ontario Pelee-Island
Procambarus acutus acutus
White River crayfish, eastern white river crayfish
Procambarus acutus acutus is a subspecies of freshwater crayfish native to the southeastern United States. It has been introduced to Ontario, Canada, where established populations now exist in the Severn Sound region and Oakbank Pond near Toronto. The species forms stable dominance hierarchies and exhibits status recognition between conspecifics. It is capable of causing economic damage to fisheries through scavenging behavior.
crayfish invasive freshwater decapod fisheries-damage dominance-hierarchy
Procambarus fallax
Slough Crayfish, Deceitful Crayfish
Procambarus fallax is a freshwater crayfish native to peninsular Florida and southern Georgia, USA, where it inhabits tributaries of the Satilla River. The species is notable as the sexual parental species of the parthenogenetic Marmorkrebs (marbled crayfish), which originated as a single lineage from P. fallax through apomictic parthenogenesis. While P. fallax reproduces sexually with separate males and females, its parthenogenetic derivative has achieved global distribution through the aquarium trade and exhibits high invasive potential due to single-female founding capability.
crayfish decapod parthenogenesis invasive-species aquarium-trade ecosystem-engineer Marmorkrebs Florida-endemic Satilla-River Cambaridae freshwater-crustacean asexual-reproduction conservation-biology aquatic-invasive-species model-organism