Active-hunter
Guides
Amblyomma americanum
Lone Star Tick, Northeastern Water Tick, Turkey Tick, Cricker Tick
Amblyomma americanum is a three-host hard tick native to eastern North America, notable for its aggressive host-seeking behavior and expanding geographic range. Adult females are distinguished by a silvery-white star-shaped spot on the scutum, while males display white streaks or spots at the shield margins. The species is the primary vector of Ehrlichia chaffeensis and Ehrlichia ewingii, and its bite can induce alpha-gal syndrome—a delayed allergic reaction to mammalian meat. Unlike many ticks, A. americanum exhibits active horizontal movement rather than passive questing, traveling up to 9 meters in 24 hours in field conditions.
Arctosa alpigena
Hilltop Wolf Spider
Arctosa alpigena is a wolf spider in the family Lycosidae with a holarctic distribution spanning North America, Greenland, and Eurasia. It is one of numerous Arctosa species adapted to open, often sandy or gravelly habitats. Like other wolf spiders, it is an active ground-dwelling hunter rather than a web-builder. The species has been subject to reproductive biology studies examining spatial and temporal patterns of mating and offspring production.
Arctosa raptor
Raptor Wolf Spider
Arctosa raptor is a species of wolf spider in the family Lycosidae. It has been documented across a broad geographic range spanning northern Eurasia and North America, with records from Russia (including Kamchatka), Nepal, the United States, and Canada. The species was first described by Polish arachnologist Władysław Kulczyński in 1885. Like other wolf spiders, it is an active hunter that does not construct webs to capture prey.
Castianeira athena
Castianeira athena is a species of ant-mimic spider in the family Corinnidae, first described by Reiskind in 1969. Like other members of its genus, it exhibits Batesian mimicry of ants as a defensive strategy against predators. The species occurs in the United States and Mexico. As a corinnid spider, it is an active hunter rather than a web-builder.
Castianeira cingulata
twobanded antmimic, two-banded ant-mimic sac spider
Castianeira cingulata is a small ant-mimicking spider in the family Corinnidae, commonly known as the twobanded antmimic. Females measure 7–8 mm in body length, males 6–7 mm. The species exhibits Batesian mimicry of carpenter ants through coloration, body shape, and behavioral displays including bobbing movements and foreleg waving that simulates antennae. It inhabits woodland leaf litter across eastern North America, where it hunts insect prey.
ant-mimicryBatesian-mimicryleaf-litter-predatorCorinnidaeeastern-North-Americaforest-floor-spiderharmless-to-humansoverwintering-in-silk-sacksdiurnal-and-nocturnalslow-deliberate-movementforeleg-waving-displaysmall-size-6-8mmtwo-pale-abdominal-bandscarpenter-ant-mimicwoodland-habitatactive-hunternon-web-building-spidersilken-retreat-constructionpotential-multi-year-lifespan-in-southwandering-behavior-brings-indoorsClubiona mixta
Mixed Sac Spider
Clubiona mixta is a sac spider in the family Clubionidae, described by Emerton in 1890. It is one of many species in the genus Clubiona, which are characterized by having a distinct groove in the center of the carapace and a tuft of curved setae on the front edge of the abdomen. These features help distinguish Clubiona from the superficially similar genus Cheiracanthium (longlegged sac spiders), which lacks both characters. Sac spiders in this family are active hunters that do not build webs to capture prey.
Clubiona pacifica
Pacific sac spider
Clubiona pacifica is a species of sac spider in the family Clubionidae, first described by Banks in 1896. It is found in the United States and Canada, with confirmed records from Alberta and British Columbia. As a sac spider, it does not construct webs for prey capture but instead actively hunts. The species has been the subject of life history and ecological studies in Washington State.
Clubiona pygmaea
Pygmy Sac Spider
Clubiona pygmaea is a species of sac spider in the family Clubionidae, first described by Nathan Banks in 1892. It is distributed across the United States and Canada. As a member of the sac spider family, it likely constructs silken retreats rather than prey-capture webs and hunts actively for small prey. The species epithet "pygmaea" refers to its small size relative to other members of the genus.
Clubiona spiralis
sac spider
Clubiona spiralis is a species of sac spider in the family Clubionidae, first described by Emerton in 1909. It occurs in the United States and Canada. Like other members of its genus, it is an active hunter that does not build webs for prey capture.
Ctenus exlineae
Arkansas wandering spider
Ctenus exlineae is a wandering spider in the family Ctenidae, first described by Peck in 1981. It is endemic to the United States, where it has been documented primarily in Arkansas. The species is commonly known as the Arkansas wandering spider. Like other ctenids, it is an active hunter that does not build webs to capture prey. It is among the more frequently observed Ctenus species in North America, with 97 iNaturalist observations as of the source date.
Drassodes neglectus
Neglected Ground Hunter Spider
Drassodes neglectus is a ground spider in the family Gnaphosidae, characterized by its ground-dwelling hunting behavior. The species occurs across a broad geographic range spanning Russia (Far East, Middle to East Siberia), Kazakhstan, and North America. It belongs to a genus of active hunters that do not construct webs for prey capture. Available records indicate it has been documented in 35 iNaturalist observations.
Ebo evansae
Evans's Running Crab Spider
Ebo evansae is a species of running crab spider in the family Philodromidae. The genus Ebo is characterized by extremely elongated second legs that are at least twice the length of the other legs, giving these small spiders the greatest relative leg span for their body size among North American spiders. Body length ranges from 2–6 mm depending on species. The genus name derives from a medieval German diminutive meaning 'prince' or 'lord'. Ebo evansae occurs in the United States and Mexico.
Ebo latithorax
running crab spider
Ebo latithorax is a species of running crab spider in the family Philodromidae. It belongs to a genus characterized by exceptionally long second legs that are at least twice the length of the other legs, giving these small spiders an unusual 'wingspan' relative to their body size. The species is found in the United States and Canada, with records from Alberta, Manitoba, and Saskatchewan. Like other philodromids, it is an active hunter that prowls for prey among vegetation rather than building webs to capture food.
Ebo pepinensis
running crab spider
Ebo pepinensis is a species of running crab spider in the family Philodromidae, first described by Gertsch in 1933. It is a small spider with a body length of 2–6 mm, characterized by its extremely elongated second pair of legs that are at least twice as long as the other legs. The species is found across the United States and southern Canada. Like other philodromids, it is an active hunter that prowls for prey among grasses and foliage rather than building webs to capture food.
Euryopis formosa
Euryopis formosa is a species of cobweb spider in the family Theridiidae, first described by Banks in 1908. It belongs to the genus Euryopis, a group of small ant-hunting spiders that exhibit unusual behavioral traits for their family. The species is found in the United States and Canada. Like other members of its genus, it does not construct prey-catching webs but instead employs active hunting strategies targeting ants.
Euryopis mulaiki
Euryopis mulaiki is a minute cobweb spider (Theridiidae) in the subfamily Hadrotarsinae, distinguished by its unusual hunting behavior. Unlike web-building relatives, this species is an active ant predator that immobilizes prey by flinging silk rather than constructing capture webs. Adults are exceptionally small, with body lengths of 1.3–4.7 mm, and exhibit a characteristic sub-triangular abdominal shape with bold color patterns. The species was described by Levi in 1954 and occurs in the southwestern United States and Mexico.
Hamataliwa grisea
Lynx spider
Hamataliwa grisea is a species of lynx spider in the family Oxyopidae, first described by Keyserling in 1887. This small to medium-sized spider is known from the southwestern United States and Mexico. Like other oxyopids, it is an active hunter that relies on vision and speed rather than web-building to capture prey. The species is part of a genus characterized by distinctive eye arrangements and spiny legs adapted for ambush predation.
Hentzia mitrata
White-jawed Jumping Spider
Hentzia mitrata, commonly known as the white-jawed jumping spider, is a small jumping spider species in the family Salticidae. The species was first described by Nicholas Marcellus Hentz in 1846 and has undergone several taxonomic revisions, with multiple synonyms now synonymized under the current name. It is widely distributed across eastern North America, from southeastern Canada through the eastern United States to Nebraska, with additional records from the Bahamas. The species exhibits sexual dimorphism in size, with females slightly larger than males, and displays distinctive coloration patterns on the cephalothorax and abdomen.
Oxyopes occidens
Oxyopes occidens is a species of lynx spider in the family Oxyopidae, first described by Brady in 1964. The species is known from the United States and Mexico. Like other lynx spiders, it is an active predator that hunts rather than building webs to capture prey. Available information on this species is limited, with most records coming from general taxonomic databases and few detailed biological studies.
Paramaevia poultoni
Three-lined Maevia
Paramaevia poultoni is a species of jumping spider in the family Salticidae, commonly known as the Three-lined Maevia. It is a small to medium-sized jumping spider found in North America. The species exhibits the characteristic large anterior median eyes and active hunting behavior typical of salticids.
Pardosa albomaculata
Thin-legged wolf spider
Pardosa albomaculata is a species of thin-legged wolf spider in the family Lycosidae, originally described by Emerton in 1885. It was previously treated as a synonym of P. groenlandica but has been reestablished as a distinct species based on morphological differences in male palpal structures and female epigynes. It belongs to the glacialis/groenlandica species complex, a group of closely related Holarctic Pardosa species. The species is part of the most abundant genus of wolf spiders in North America.
Pardosa atlantica
Atlantic wolf spider, thin-legged wolf spider
Pardosa atlantica is a species of wolf spider in the family Lycosidae, described by Emerton in 1913. As a member of the genus Pardosa, commonly known as thin-legged wolf spiders, it belongs to one of the most abundant wolf spider genera in North America. The species is found in the United States, though specific details about its ecology and biology remain limited in available literature. Like other Pardosa species, it is likely a ground-dwelling, active hunter.
Pardosa lowriei
Lowrie's Thin-legged Wolf Spider
Pardosa lowriei is a species of thin-legged wolf spider in the family Lycosidae, first described by Kronestedt in 1975. As a member of the genus Pardosa, it is characterized by long spines on the legs that are nearly perpendicular to the leg axis, distinguishing it from other wolf spider genera. The species is found in the United States and Canada. Like other Pardosa species, it is likely a ground-dwelling active hunter, though specific behavioral details for this species are not well documented.
Pardosa pauxilla
thin-legged wolf spider
Pardosa pauxilla is a small wolf spider in the family Lycosidae, first described by Montgomery in 1904. It belongs to the genus Pardosa, commonly known as thin-legged wolf spiders, characterized by distinctive long leg spines perpendicular to the leg axis. The species is documented from the United States, with 626 observations recorded on iNaturalist. Like other Pardosa species, it likely inhabits diverse environments including wetlands, woodlands, and open fields.
Pardosa tuoba
Pardosa tuoba is a species of wolf spider in the family Lycosidae, first described by Chamberlin in 1919. It belongs to the genus Pardosa, commonly known as thin-legged wolf spiders, which are among the most abundant wolf spiders in North America. The species is known from the United States, though specific details about its ecology and distribution remain limited in available sources. As with other Pardosa species, it is likely a ground-dwelling active hunter.
Pardosa uintana
Pardosa uintana is a species of thin-legged wolf spider in the family Lycosidae, described by Gertsch in 1933. Like other members of the genus Pardosa, it is characterized by long spines on the legs that are nearly perpendicular to the leg axis. The species occurs in western North America, with records from Alberta and British Columbia in Canada. As with most Pardosa species, identification to species level requires microscopic examination of genitalia.
Pasimachus sublaevis
Moderately Smooth Warrior Beetle
Pasimachus sublaevis is a large ground beetle in the family Carabidae, commonly known as the Moderately Smooth Warrior Beetle. The species occurs across North America and is one of several species in the genus Pasimachus, which are notable for their robust build, large mandibles, and active predatory behavior. Warrior beetles are among the more conspicuous carabids in open habitats due to their size and diurnal activity patterns.
Peucetia viridans
Green Lynx Spider
Peucetia viridans is the largest North American lynx spider, distinguished by its bright green coloration and active hunting behavior. Unlike web-building spiders, it pursues prey with agility comparable to jumping spiders, pouncing in a cat-like manner that inspired its common name. Females exhibit extended maternal care, guarding egg sacs and early spiderlings while reducing their own foraging activity. The species occupies a notable position in agricultural ecosystems, where it preys on both crop pests and beneficial insects.
Phidippus cardinalis
cardinal jumper
Phidippus cardinalis is a jumping spider in the family Salticidae, commonly known as the cardinal jumper. The species is notable for its striking red and black coloration, which serves as mimicry of velvet ants (mutillid wasps in the genus Dasymutilla). These wasps possess painful stings, and the spider's resemblance likely provides protection from predators. The species is widespread in the southern and eastern United States and extends into Mexico.
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t-identificationhaving-having-basis-identificationhaving-having-foundation-identificationhaving-having-ground-identificationhaving-having-reason-identificationhaving-having-cause-identificationhaving-having-motive-identificationhaving-having-rationale-identificationhaving-having-explanation-identificationhaving-having-interpretation-identificationhaving-having-understanding-identificationhaving-having-comprehension-identificationhaving-having-grasp-identificationhaving-having-apprehension-identificationhaving-having-insight-identificationhaving-having-intuition-identificationhaving-having-wisdom-identificationhaving-having-knowledge-identificationhaving-having-information-identificationhaving-having-data-identificationhaving-having-fact-identificationhaving-having-truth-identificationhaving-having-reality-identificationhaving-having-actuality-identificationhaving-having-happening-identificationhaving-having-taking-place-identificationhaving-having-coming-about-identificationhaving-having-coming-to-pass-identificationhaving-having-transpiring-identificationhaving-having-unfolding-identificationhaving-having-developing-identificationhaving-having-evolving-identificationhaving-having-progressing-identificationhaving-having-advancing-identificationhaving-having-proceeding-identificationhaving-having-continuing-identificationhaving-having-persisting-identificationhaving-having-lasting-identificationhaving-having-enduring-identificationhaving-having-remaining-identificationhaving-having-staying-identificationhaving-having-abiding-identificationhaving-having-subsisting-identificationhaving-having-surviving-identificationhaving-having-living-identificationhaving-having-existing-identificationPhilodromus exilis
Philodromus exilis is a species of running crab spider in the family Philodromidae. It is found in the United States and Canada. The species belongs to a family characterized by laterigrade legs adapted for sideways movement and active hunting behavior rather than web-building.
Philodromus imbecillus
running crab spider
Philodromus imbecillus is a species of running crab spider in the family Philodromidae, first described by Keyserling in 1880. It occurs in the United States and Canada. Like other members of its genus, it is an active hunter that does not build webs to capture prey.
Philodromus infuscatus
Running crab spider
Philodromus infuscatus is a running crab spider in the family Philodromidae, part of the infuscatus species group comprising 20 species and 2 subspecies. The species is divided into two subspecies: P. i. infuscatus in the eastern United States and P. i. utus Chamberlin in the western United States. It is the only member of its species group to reach Canada. These spiders are active hunters that do not build webs to capture prey.
Philodromus keyserlingi
running crab spider
Philodromus keyserlingi is a species of running crab spider in the family Philodromidae. It occurs in the United States and Canada. Like other members of its genus, it is an active hunter that does not build webs to capture prey, instead relying on speed and ambush. The species is part of a diverse genus of crab spiders commonly encountered on vegetation and structures.
Philodromus possiblepratariae
Running crab spider
Philodromus possiblepratariae is a running crab spider in the family Philodromidae. Like other members of this genus, it is an active hunter that does not build webs to capture prey. The species is part of a diverse genus of spiders commonly found on vegetation and structures, where they rely on speed and camouflage to ambush prey. The specific epithet suggests possible taxonomic uncertainty or similarity to P. pratariae.
Philodromus vulgaris
longlegged crab spider
Philodromus vulgaris is a running crab spider in the family Philodromidae, commonly known as the longlegged crab spider. It is a small to medium-sized spider found across North America, including the United States and Canada. The species belongs to a genus known for its flattened body form and laterigrade leg orientation, adaptations that facilitate sideways movement and hunting on flat surfaces. It is one of numerous Philodromus species documented in the region, though specific biological details remain limited in published literature.
Platycryptus
Tan Jumping Spider
Platycryptus is a genus of jumping spiders (Salticidae) described by D. E. Hill in 1979. The name derives from Greek 'platy' (flat) and 'crypt' (hidden), referring to their flattened bodies and habit of hiding in crevices. These spiders are characterized by cryptic gray and brown coloration with hairy bodies. They are active hunters found on tree bark and wooden structures, with four recognized species distributed across North America, Central America, and Brazil.
Tibellus
Slender Crab Spiders
Tibellus is a genus of active-hunting spiders in the family Philodromidae, commonly called slender crab spiders. They are characterized by elongated, flattened bodies with longitudinal dorsal stripes that provide camouflage on grasses and vegetation. Unlike web-building spiders, they pursue prey directly on low vegetation. The genus contains 51 recognized species distributed across Eurasia, Africa, the Americas, and Australia. Adults range from 4–15 mm in body length.
Tibellus oblongus
oblong running spider, slender crab spider
Tibellus oblongus is a Holarctic spider in the family Philodromidae. It is an active hunter that does not construct webs, instead pursuing and ambushing small insect prey. The species exhibits distinctive elongated body morphology with longitudinal striping that provides camouflage in grassy vegetation. Adult females measure 6–11 mm in body length, with males slightly smaller at 5–8 mm. Females construct flattened egg sacs and guard them until spiderlings emerge.
Varacosa parthenus
Varacosa parthenus is a species of wolf spider in the family Lycosidae. It is endemic to the Southeastern United States. The species was described by Chamberlin in 1925. Like other wolf spiders, it is a ground-dwelling, active hunter that does not build webs to capture prey.
Wulfila
ghost spiders
Wulfila is a genus of ghost spiders (family Anyphaenidae) comprising at least 40 described species. These spiders are active hunters that do not construct webs for prey capture. They are commonly found in urban environments, where research has documented their association with scale-infested trees and shrubs. As members of the hunting spider guild, they contribute to biological control of pest insects in managed landscapes.
Wulfila albens
ghost spider
Wulfila albens is a species of ghost spider in the family Anyphaenidae, first described by Hentz in 1847. It is found in the United States and Jamaica. As an active hunting spider, it does not construct webs to capture prey. The species has been documented as part of natural enemy communities in urban landscapes, particularly in association with scale-infested trees.
Yersiniops
Grasshopper Mantises
Yersiniops is a genus of ground-dwelling mantids native to the Americas, distinguished by their cursorial hunting strategy of actively running down prey rather than ambushing from vegetation. The genus is characterized by pointed, 'horned' eyes and predominantly gray coloration. Two species, Y. solitarius and Y. sophronicus, occur in the United States, where they inhabit arid western regions. These small mantids represent one of two ground mantid genera in North America, alongside Litaneutria.