Cherokee Orbweaver
Acanthepeira cherokee is a species of orb-weaving spider in the family Araneidae, described by Herbert W. Levi in 1976. It belongs to a genus characterized by distinctive abdominal tubercles or spines that provide camouflage. The species is found in the United States, though specific details about its biology and ecology remain limited in published literature.
Acanthepeira marion is an orb-weaving spider in the family Araneidae, first described by Levi in 1976. The species is distributed across the United States and Mexico. As a member of the genus Acanthepeira, it shares the distinctive spiny abdominal tubercles characteristic of this group of orbweavers.
Northern Orbweaver
Aculepeira packardi is an orb-weaving spider in the family Araneidae, commonly known as the Northern Orbweaver. The species has a broad transcontinental distribution spanning North America and Eurasia. It constructs characteristic spiral wheel-shaped webs to capture prey. The species was first described by Thorell in 1875 under the basionym Epeira packardii.
Agelenopsis kastoni is a species of funnel weaver spider in the family Agelenidae. It is found in the United States. Like other members of its genus, it constructs characteristic funnel-shaped webs and is an active hunter rather than a passive web trapper.
Agelenopsis longistyla is a small funnel weaver spider in the family Agelenidae, first described by Nathan Banks in 1901. It is the smallest species in the genus Agelenopsis when excluding leg measurements. The species is found in the central United States and constructs characteristic funnel-shaped webs with sheet-like platforms.
Agelenopsis oregonensis is a funnel-web spider in the family Agelenidae. It is found in the United States and Canada, with records from Alberta and British Columbia. Like other members of its genus, it constructs sheet webs with a funnel-shaped retreat. The species was described by Chamberlin and Ivie in 1935.
Pennsylvania Grass Spider, Pennsylvania Funnel-web Spider
Agelenopsis pennsylvanica is a funnel-web spider native to the United States, recognized by its characteristic funnel-shaped retreat web. Females are larger than males and exhibit notable sexual cannibalism during mating, a behavior that has been extensively studied in this species. The spider is an ambush predator that relies on vibration detection to capture prey. Its distribution spans at least 21 states, with highest abundance in areas with high humidity and water availability.
funnel weaver spider
Agelenopsis spatula is a species of funnel weaver spider in the family Agelenidae, first described in 1935 by Ralph Vary Chamberlin and Wilton Ivie. It is known only from the United States. As a member of the genus Agelenopsis, it shares the characteristic funnel-web building behavior and elongated spinnerets typical of this group.
Utah Funnelweb Spider
Agelenopsis utahana is a species of funnel-web spider in the family Agelenidae. It is found in the United States and Canada, with records from Alberta and British Columbia. Like other members of its genus, it constructs sheet-like webs with a funnel-shaped retreat and hunts prey through rapid pursuit rather than passive entrapment.
Agnyphantes is a genus of dwarf spiders (family Linyphiidae) containing only two species: A. arboreus and A. expunctus. The genus was established by J. E. Hull in 1932. These spiders belong to the sheet-web weaving spiders, though specific details about their biology remain poorly documented.
Agnyphantes arboreus is a species of sheet-web weaver spider in the family Linyphiidae, first described by Emerton in 1915 under the name Bathyphantes arborea. It is a small spider native to western North America, with confirmed records from Alberta and British Columbia in Canada. Like other linyphiids, it constructs flat sheet webs to capture prey. The species epithet 'arboreus' suggests an association with trees or woody vegetation.
Agroeca pratensis is a species of liocranid sac spider first described by Emerton in 1890. It belongs to the family Liocranidae, a group of small to medium-sized wandering spiders. The species is documented from the United States and Canada, with specific records from Alberta, British Columbia, and Manitoba in Canada. Observations are relatively sparse, with limited published ecological or behavioral data available.
Agyneta barrowsi is a species of sheet weaver spider in the family Linyphiidae, described by Chamberlin & Ivie in 1944. It occurs in the United States and Canada. The genus Agyneta belongs to the large family of dwarf sheet weavers, which are characterized by their small size and flat, sheet-like webs.
Agyneta bronx is a species of sheet weaver spider (family Linyphiidae) described by Nadine Dupérré in 2013 from specimens collected across multiple U.S. states. The species epithet references The Bronx, New York, where the type specimen was collected in 1964. It belongs to a large genus of small-bodied spiders commonly known as money spiders.
Agyneta olivacea is a species of sheet-web spider (family Linyphiidae) described by James Henry Emerton in 1882. It has a Holarctic distribution, occurring across northern regions of North America and Eurasia. The species was originally described under the basionym Microneta olivacea. As a member of the sheet weaver family, it constructs flat, horizontal webs rather than aerial orb webs.
Agyneta semipallida is a species of sheet weaver spider in the family Linyphiidae. It was described from the United States in 1944. The species is known from limited records and has not been documented on iNaturalist. It was originally described as Meioneta semipallida before being transferred to Agyneta.
Agyneta serrata is a sheet weaver spider described by Emerton in 1909. It belongs to the family Linyphiidae, one of the largest families of spiders commonly known as money spiders or sheet web weavers. The species has been documented in Canada and the United States.
Allocosa sublata is a species of wolf spider in the family Lycosidae, first described by Montgomery in 1902. It is a ground-dwelling spider known from the United States. Very few observations exist in public databases, with only five records on iNaturalist as of the latest data. The genus Allocosa contains multiple North American species, many of which occupy similar terrestrial habitats.
Bifurcate Trashline Orbweaver, Forked-tail Trashline Orbweaver
Allocyclosa bifurca is a small orb-weaving spider and the sole species in its genus. Adult females measure 5.1–8.5 mm in body length and are silvery or white in color. The species is distinguished by a forked (bifurcate) projection at the rear of the abdomen—two humps shaped like the letter 'M'—giving it the Latin name meaning 'two-forked.' This is the only Cyclosa-like species north of Mexico with this forked tail structure. The spider exhibits remarkable camouflage behavior, arranging debris and egg sacs in a vertical line through its web to masquerade as bird droppings. Unusually, males are rarely observed, and females possess vestigial external genitalia with no external opening, suggesting possible parthenogenic reproduction. The species is also notable as a host for parasitic wasps that chemically manipulate its web-building behavior.
Lace web spiders, Tangled nest spiders
Amaurobius is a genus of araneomorph spiders in the family Amaurobiidae, first described by Carl Ludwig Koch in 1837. The genus contains approximately 68 species with primarily Holarctic distribution. Members are commonly known as lace web spiders or tangled nest spiders due to their characteristic web architecture. The genus includes notable species such as Amaurobius ferox, which exhibits the rare behavioral phenomenon of matriphagy, where offspring consume the mother after hatching.
hacklemesh weaver
Amaurobius borealis is a species of hacklemesh weaver spider in the family Amaurobiidae. It occurs across northern North America, with records from the United States and Canada. The species was described by Emerton in 1909. Like other members of its genus, it constructs tangled, irregular webs.
Lace-Weaver Spider, lace-webbed spider
Amaurobius similis is a small spider in the family Amaurobiidae, commonly known as the lace-weaver spider. It is frequently found in human dwellings, particularly near windows and in wall crevices. The species is visually similar to A. fenestralis, with which it has been historically confused, and reliable identification requires microscopic examination of genitalia. It has a Holarctic distribution, native to Europe and the Caucasus, and has been introduced to North America.
Southeastern Wandering Spider
Anahita punctulata, commonly known as the southeastern wandering spider, is a species of wandering spider in the family Ctenidae. It is found in the United States. The species was first described by Hentz in 1844.
Anapistula secreta is a minute spider species in the family Symphytognathidae, a group known for some of the smallest spiders in the world. The species was described by Willis J. Gertsch in 1941. Members of this family typically exhibit reduced body plans adapted to specialized microhabitats. Anapistula secreta has been recorded from the Caribbean region and northern South America.
Anthrobia acuminata is a species of sheet-web weaver spider in the family Linyphiidae, described by Emerton in 1913. This spider belongs to a large family of small-bodied arachnids commonly known as money spiders or sheet-web weavers, characterized by their distinctive flat, horizontal web architecture. The genus Anthrobia is part of the diverse North American linyphiid fauna. Specific ecological and behavioral details for this species remain poorly documented in available literature.
Antistea brunnea is a small true spider in the family Hahniidae, commonly known as the comb-tailed spiders or dwarf sheet spiders. This species is one of the larger members of the genus Antistea and ranges across northeastern North America. It builds thin, sheet-like webs across small depressions in soil, often in mammal footprints. The species is seldom encountered due to its small size and cryptic habits.
folding-door spiders, folding trapdoor spiders, turret spiders
Antrodiaetidae is a small family of mygalomorph spiders comprising four genera and approximately 37 species. Members are commonly known as folding-door spiders or folding trapdoor spiders due to their distinctive burrow architecture: they construct silk-lined burrows with hinged, collapsible doors that fold or unfold to seal the entrance. The family is primarily distributed in the western and midwestern United States, with two relict species endemic to Japan. Antrodiaetidae are closely related to Atypidae (atypical tarantulas) and share the characteristic low dispersal ability typical of mygalomorph spiders.
Antrodiaetus hageni is a species of folding-door spider in the family Antrodiaetidae, first described by Chamberlin in 1917. It belongs to the infraorder Mygalomorphae, a group of spiders characterized by downward-directed fangs and relatively primitive body plans. The species is known from the United States, though detailed natural history information remains limited in published sources.
folding-door spider
Antrodiaetus pugnax is a species of folding-door spider in the family Antrodiaetidae. It belongs to the infraorder Mygalomorphae, one of the three main lineages of spiders. The species was originally described as Brachybothrium pugnax by Chamberlin in 1917. Like other members of its genus, it constructs a burrow with a folding door, distinguishing it from trapdoor spiders that use a hinged door.
ghost spider
Anyphaena aperta is a species of ghost spider in the family Anyphaenidae, first described by Nathan Banks in 1921. The species is native to North America and has been documented in both the United States and Canada. It has been observed utilizing Australian tea tree plants (Leptospermum species) as habitat, representing an adaptation to an invasive plant species in its range. Ghost spiders in this family are generally nocturnal hunters that do not build webs to capture prey.
ghost spider
Anyphaena californica is a species of ghost spider in the family Anyphaenidae, first described by Banks in 1904. It is native to the western United States, particularly California, where it inhabits various terrestrial environments. As a member of the ghost spider family, it is likely nocturnally active and hunts without constructing permanent webs for prey capture.
ghost spider
Anyphaena celer is a species of ghost spider (family Anyphaenidae) native to North America. It is one of 32 previously described species in the species-rich celer group within the genus Anyphaena. The species was originally described as Clubiona celer by Hentz in 1847. Like other anyphaenids, it is nocturnally active and associated with vegetation.
ghost spider
Anyphaena fraterna is a species of ghost spider in the family Anyphaenidae, first described by Banks in 1896. It belongs to a family of wandering hunters that do not build permanent webs for prey capture. The species is documented from the United States, though specific details about its ecology and behavior remain limited in published literature. Like other anyphaenids, it is presumably nocturnally active and associated with vegetation.
Eastern Spurred Ghost Spider
Anyphaena pectorosa is a species of ghost spider in the family Anyphaenidae, first described by L. Koch in 1866. It belongs to the pectorosa species group, one of five groups recognized within the North American and Mexican Anyphaena fauna. The species is distributed across the United States and Canada. As a member of Anyphaenidae, it is a wandering hunter rather than a web-builder.
Aphonopelma joshua is a species of tarantula in the family Theraphosidae, described by Prentice in 1997. It is native to California, United States. Like other members of the genus Aphonopelma, this species is a large-bodied, ground-dwelling spider that constructs burrows. The genus has undergone significant taxonomic revision, with a 2016 study reducing the number of recognized U.S. species from 55 to 29 based on integrative morphological, molecular, and ecological data.
Apollophanes texanus is a species of running crab spider in the family Philodromidae. The species was described by Nathan Banks in 1904. It occurs in the southern United States and Mexico. Like other philodromids, it is an active hunter that does not construct webs to capture prey.
Apomastus schlingeri is a venomous trapdoor spider species described by Bond & Opell in 2002. It was originally misidentified as Aptostichus schlingeri before taxonomic revision placed it in the genus Apomastus. The species is known for producing a complex of neurotoxic peptides called aptotoxins, which function as voltage-gated sodium channel blockers. It is one of only two known species in the genus Apomastus, both restricted to the United States.
A genus of anyphaenid sac spiders native to the Americas, first described by Octavius Pickard-Cambridge in 1882. The genus comprises 21 recognized species, including seven recently described species. Arachosia species are primarily associated with grassland and forest habitats. A taxonomic revision resolved long-standing identification problems in the A. cubana species complex and documented disjunct distribution patterns suggesting potential cryptic speciation.
ghost spider
Arachosia cubana is a species of ghost spider in the family Anyphaenidae. It was originally described by Banks in 1909. The species belongs to a species complex within the genus that previously presented identification challenges, now resolved through taxonomic revision. It is part of a genus containing 21 species distributed across the Americas.
Typical Spiders, True Spiders, Labidognatha
Araneomorphae is a suborder of spiders comprising approximately 92% of all living spider species. Members are distinguished by chelicerae (fangs) that oppose each other diagonally forward and cross in a pinching action, contrasting with the parallel, downward-pointing fangs of Mygalomorphae. This diverse group includes orb-weavers, cobweb spiders, jumping spiders, wolf spiders, crab spiders, and huntsman spiders. Most species have at most one pair of book lungs and typically exhibit annual life cycles.
Giant Lichen Orbweaver
Araneus bicentenarius, commonly known as the giant lichen orbweaver, is a large orb-weaving spider in the family Araneidae. It occurs in eastern North America, where it constructs notably large webs. Unlike most Araneus species, adults typically position themselves at the edge of the web rather than hanging upside down in the center.
Araneus bivittatus is a species of orb-weaving spider in the family Araneidae. It is known from the United States, though specific details about its biology and ecology remain poorly documented in the available literature. The species name 'bivittatus' refers to two stripes or bands, suggesting distinctive abdominal markings.
Araneus bonsallae is an orb-weaving spider in the family Araneidae. The species was described by McCook in 1894. It is known from north-central Texas in the United States. As a member of the genus Araneus, it constructs orb-shaped webs to capture prey, though specific details of its biology remain poorly documented.
Araneus calusa is a species of orb-weaving spider in the family Araneidae, described by Herbert W. Levi in 1973. The species is known from the United States, though specific details about its biology, appearance, and ecology remain poorly documented in the available literature. As with other members of the genus Araneus, it likely constructs circular orb webs to capture flying insect prey.
Red-spotted Orbweaver
Araneus cingulatus is a species of orb-weaving spider in the family Araneidae, commonly known as the Red-spotted Orbweaver. It occurs in the United States and British Columbia, Canada. As an orb-weaver, it constructs spiral wheel-shaped webs to capture prey. The species belongs to the large and diverse genus Araneus, which contains many common North American orb-weaving spiders.
Araneus detrimentosus is an orb-weaving spider in the family Araneidae, found from the United States through Central America to Colombia. It constructs spiral wheel-shaped webs typical of the family. The species was first described by O. Pickard-Cambridge in 1889.
Juniper Orbweaver
Araneus juniperi is a species of orb-weaving spider in the family Araneidae, commonly known as the Juniper Orbweaver. It is native to North America and has been documented in the United States and Canada. As a member of the genus Araneus, it constructs spiral orb webs to capture prey. Specific details about its ecology and behavior remain limited in published sources.
Araneus mammatus is a species of orb-weaver spider in the family Araneidae, described by Archer in 1951. It is known from the United States, though specific details about its biology and ecology remain poorly documented in the available literature. As a member of the large genus Araneus, it constructs spiral wheel-shaped webs typical of the family.
Black-spotted Orbweaver
Araneus miniatus is a species of orb-weaving spider in the family Araneidae, commonly known as the Black-spotted Orbweaver. It is found in the United States and is one of many species in the large genus Araneus, which includes numerous North American orb weavers with diverse abdominal patterns. Like other members of its genus, it constructs circular webs to capture prey.
Nordmann's Orbweaver Spider
Araneus nordmanni is a species of orb-weaving spider in the family Araneidae. It is widely distributed across the Northern Hemisphere, occurring in North America, Europe, the Caucasus, Russia, Kazakhstan, Korea, and Japan. As an orb weaver, it constructs spiral wheel-shaped webs to capture prey. The species is one of many in the large genus Araneus, which contains numerous common and widespread orb-weaving spiders.