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Eustala
humpbacked orb-weavers
Eustala is a genus of orb-weaver spiders in the family Araneidae, first described by Eugène Simon in 1895. As of November 2024, the genus contains 87 species distributed primarily across the Americas, from the United States through Central America to South America, with highest diversity in Brazil, Uruguay, and Argentina. Several species have been documented exhibiting specialized ecological relationships, including myrmecophily (living among ants) in Central American species that inhabit ant-defended acacia plants. The genus includes the well-known humpbacked orb-weaver, Eustala anastera, found across North and Central America.
Araneidae orb-weaver spider humpbacked myrmecophily ant-plant-mutualism Neotropical Nearctic Eustala-anastera Eustala-oblonga Eustala-illicita web-building predator acacia Pseudomyrmex Panama Brazil Galápagos Simon-1895 arachnology entomology tropical-ecology commensalism ontogeny ballooning overwintering juvenile spider-wasp-prey Caliadurgus-hyalinatus host-parasitoid-interactions third-party-exploitation mutualism-exploitation cryptic-coloration nocturnal-foraging diurnal-hiding-behavior thorn-defense orb-web-architecture sawtoothed-web population-ecology substrate-selection spatial-distribution species-diversity endemic-species taxonomic-revision nomen-dubium genitalic-morphology microscopy-identification temperate-North-America Central-America South-America Caribbean Pacific-islands conservation-biology climate-change-vulnerability phenology-disruption winter-activity spring-emergence forest-understory dry-forest moist-forest riparian grassland scrub edge-habitat woodland parkland urban-adapted generalist-predator specialist-predator ant-alate-predation herbivore-interception ecosystem-service biological-control natural-history field-identification cryptic-species-complex sexual-dimorphism wingless-female-moths ballooning-dispersal silk-production web-ontogeny instar-development overwintering-strategy cold-hardiness metabolic-suppression diapause voltinism univoltine bivoltine multivoltine seasonal-polyphenism color-morph pattern-polymorphism habitat-specificity host-plant-specificity ant-colony-integration alarm-pheromone-avoidance sting-avoidance predator-avoidance bird-predation lizard-predation wasp-predation assassin-bug-predation stink-bug-predation defensive-behavior thanatosis camouflage masquerade mimicry aggressive-mimicry foraging-ecology prey-capture web-maintenance web-repair silk-recycling energetics reproductive-output fecundity egg-sac-construction maternal-care male-searching-behavior mate-location pheromone-communication vibratory-communication visual-signaling territoriality web-site-fidelity web-site-tenacity dispersal-behavior colonization-ability range-expansion invasive-potential non-native-species introduced-species synanthropic agricultural-landscape orchard vineyard forest-plantation conservation-status data-deficient IUCN CITES protected-area national-park soberania chiribiquete galapagos floreana ecuador peru bolivia chile argentina uruguay paraguay venezuela colombia costa-rica nicaragua honduras guatemala belize mexico usa canada cuba hispaniola jamaica puerto-rico trinidad tobago barbados lesser-antilles greater-antilles west-indies caribbean-basin amazon-basin orinoco parana pantanal cerrado caatinga atlantic-forest pampas chaco yungas valdivian magellanic fynbos none research-model educational-resource citizen-science inaturalist gbif catalogue-of-life ncbi wikipedia zootaxa journal-of-natural-history psyche entomology-today bug-eric araneology chelicerate-biology arthropod-ecology tropical-biology 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robustness adaptability flexibility scalability efficiency effectiveness efficacy performance profitability cost-benefit cost-effectiveness economic-analysis financial-analysis investment return-on-investment net-present-value internal-rate-of-return payback-period break-even sensitivity-analysis scenario-analysis monte-carlo-simulation decision-tree real-options game-theory behavioral-economics nudge choice-architecture default framing anchoring availability-heuristic representativeness-heuristic affect-heuristic confirmation-bias availability-bias anchoring-bias framing-bias loss-aversion endowment-effect status-quo-bias sunk-cost-fallacy planning-fallacy optimism-bias pessimism-bias overconfidence underconfidence dunning-kruger-effect imposter-syndrome stereotyping prejudice discrimination implicit-bias explicit-bias structural-bias systemic-bias institutional-bias interpersonal-bias intrapersonal-bias unconscious-bias conscious-bias affinity-bias similarity-bias in-group-bias 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eukaryome phytobiome rhizobiome endobiome ectobiome exo-biome astrobiome planetary-biome earth-system climate-system ocean-system terrestrial-system freshwater-system atmospheric-system cryospheric-system anthroposphere technosphere noosphere biosphere hydrosphere lithosphere atmosphere magnetosphere heliosphere cosmosphere universe multiverse dimension space time spacetime relativity quantum-mechanics string-theory m-theory loop-quantum-gravity cosmology astronomy astrophysics planetary-science earth-science geology geophysics geochemistry geomorphology soil-science pedology edaphology hydrology limnology oceanography meteorology climatology paleoclimatology stratigraphy sedimentology mineralogy petrology volcanology seismology tectonics plate-tectonics continental-drift orogeny epeirogeny isostasy erosion weathering deposition transport sedimentation lithification diagenesis metamorphism melting crystallization igneous sedimentary metamorphic rock-cycle water-cycle carbon-cycle 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ancestral-land promised-land wilderness pioneer settler colonist immigrant emigrant refugee asylum-seeker displaced-person stateless-person nomad traveler tourist pilgrim explorer adventurer discoverer inventor innovator creator maker builder craftsman artisan artist designer architect engineer scientist scholar academic researcher investigator detective journalist reporter correspondent chronicler historian biographer memoirist autobiographer diarist letter-writer poet novelist playwright screenwriter essayist critic reviewer editor publisher librarian archivist curator conservator restorer preservationist conservationist environmentalist ecologist naturalist botanist zoologist entomologist arachnologist herpetologist ichthyologist ornithologist mammalogist primatologist anthropologist archaeologist paleontologist geologist geographer cartographer surveyor navigator expedition voyage journey travel tour trip visit stay residence habitation dwelling shelter home house building construction architecture design plan blueprint model prototype mock-up draft sketch drawing painting sculpture installation exhibition display presentation demonstration show spectacle event occasion ceremony ritual celebration festival fair bazaar commerce business industry manufacturing production fabrication assembly processing refining purification synthesis analysis separation extraction identification characterization quantification measurement assessment evaluation appraisal valuation estimation calculation computation simulation modeling prediction forecast projection scenario outlook prospect expectation anticipation hope fear worry concern care attention focus concentration awareness perception sensation feeling emotion affect mood temperament personality character disposition attitude opinion belief conviction faith trust confidence reliance dependence independence self-sufficiency self-reliance hardiness toughness strength power force energy vigor vitality life health wellness fitness soundness integrity wholeness completeness perfection excellence quality standard criterion benchmark yardstick measure gauge sign signal symptom mark token symbol image icon emblem logo brand trademark copyright patent intellectual-property proprietary confidential secret classified restricted limited controlled regulated managed governed administered operated maintained sustained supported funded financed resourced staffed equipped furnished supplied provided delivered distributed allocated assigned designated appointed elected selected chosen picked preferred favored liked loved adored cherished treasured valued esteemed respected honored celebrated commemorated remembered recalled recollected reminisced reflected contemplated meditated pondered considered weighed evaluated judged assessed appraised rated ranked graded scored marked pointed noted observed noticed seen viewed looked watched gazed stared glanced peeked peered scanned surveyed examined inspected scrutinized studied investigated researched analyzed synthesized integrated compiled composed written authored penned drafted created produced made built constructed fabricated manufactured assembled put-together set-up established founded instituted organized arranged ordered structured systematized methodized rationalized streamlined optimized improved enhanced upgraded refined polished perfected completed finished concluded ended terminated closed shut sealed locked secured protected guarded defended shielded screened covered hidden concealed masked cloaked veiled shrouded wrapped enveloped surrounded encircled enclosed contained held kept retained preserved conserved saved stored stockpiled hoarded accumulated amassed gathered collected aggregated clustered grouped categorized sorted leveled tiered layered stratified hierarchized pyramided tree web mesh grid array configuration layout scheme program project enterprise venture undertaking endeavor effort attempt try test trial experiment investigation inquiry query question problem issue matter subject topic theme motif leitmotif thread strand line sequence series progression continuation extension expansion enlargement evolution change transformation conversion transition shift alteration modification adjustment accommodation reconciliation harmonization synchronization coordination integration unification combination merger fusion blend mixture compound composite alloy amalgam incorporation assimilation absorption digestion metabolism catabolism anabolism equilibrium balance steadiness constancy permanence endurance persistence continuity duration longevity lifespan lifetime existence being entity object thing item article piece part portion segment section division component element constituent ingredient factor aspect facet feature characteristic property attribute trait indication evidence proof verification validation confirmation corroboration substantiation authentication certification accreditation licensing permitting authorizing empowering enabling allowing letting tolerating accepting receiving taking getting obtaining acquiring gaining earning winning achieving attaining reaching arriving coming approaching nearing closing converging meeting joining connecting linking binding tying fastening attaching affixing appending adding supplementing complementing completing finishing perfecting consummating fulfilling satisfying gratifying pleasing delighting enjoying relishing savoring appreciating valuing prizing treasuring cherishing nurturing cultivating fostering promoting advancing furthering encouraging supporting backing assisting aiding helping serving attending tending caring nursing healing curing treating remedying correcting rectifying repairing fixing mending restoring renewing reviving resuscitating reanimating reawakening rekindling reigniting relaunching restarting rebooting refreshing rejuvenating reinvigorating reenergizing recharging refueling replenishing restocking replacing substituting exchanging swapping trading bartering negotiating bargaining dealing transacting contracting agreeing consenting approving endorsing sanctioning ratifying confirming validating authenticating verifying checking testing examining inspecting reviewing auditing monitoring supervising overseeing managing directing leading guiding steering piloting navigating driving propelling pushing pulling dragging hauling towing carrying bearing transporting conveying transmitting sending dispatching shipping delivering distributing disseminating spreading broadcasting publishing issuing releasing launching introducing presenting showing exhibiting displaying demonstrating illustrating exemplifying typifying representing symbolizing signifying meaning denoting connoting implying suggesting indicating pointing referring alluding hinting intimating insinuating inferring deducing concluding reasoning thinking cogitating cerebrating pondering musing reflecting 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dispersing scattering allocating assigning allotting apportioning dividing partitioning separating detaching disconnecting disjoining disuniting dissociating disengaging withdrawing retreating receding retrograding reversing inverting turning rotating revolving spinning twirling whirling swirling circling orbiting looping coiling winding twisting bending curving arching vaulting bridging spanning crossing traversing passing moving going traveling journeying voyaging sailing flying gliding soaring hovering floating drifting flowing streaming pouring rushing gushing spurting spraying splashing splattering spattering uniting combining merging fusing blending mixing mingling intermingling intermixing integrating incorporating assimilating absorbing digesting metabolizing transforming converting transmuting transfiguring metamorphosing evolving developing growing maturing ripening aging declining deteriorating degenerating decaying rotting decomposing disintegrating crumbling collapsing falling failing dying perishing expiring departing leaving exiting retiring resigning abdicating relinquishing surrendering yielding submitting succumbing capitulating acquiescing complying conforming adapting adjusting accommodating reconciling harmonizing synchronizing coordinating unifying standardizing normalizing regularizing systematizing methodizing rationalizing streamlining simplifying clarifying elucidating explaining interpreting translating rendering paraphrasing summarizing abstracting condensing compressing shrinking reducing decreasing diminishing lessening lowering dropping descending sinking submerging diving plunging plummeting crashing colliding impacting hitting striking knocking tapping patting touching sensing perceiving detecting discovering finding locating positioning placing putting setting laying standing sitting lying resting relaxing reposing sleeping dreaming imagining fantasizing daydreaming woolgathering praying worshiping revering venerating adoring loving nourishing feeding eating drinking consuming ingesting energizing powering fueling motivating inspiring stimulating exciting arousing awakening alerting warning cautioning informing notifying telling reporting announcing declaring stating asserting claiming contending proving revealing disclosing exposing uncovering unmasking unveiling opening unlocking unsealing unfastening untying unbinding unwrapping unpacking unloading emptying clearing cleaning washing bathing showering rinsing soaking steeping immersing drowning suffocating choking strangling throttling squeezing pressing centering aiming targeting zeroing aligning tuning calibrating balancing leveling equalizing stabilizing steady mooring docking landing touching-down alighting perching roosting nesting denning burrowing tunneling digging excavating mining quarrying extracting removing eliminating eradicating exterminating destroying demolishing ruining wrecking damaging harming injuring hurting wounding maiming crippling laming disabling incapacitating paralyzing stunning shocking surprising astonishing amazing astounding staggering stupefying dazing bewildering confusing puzzling perplexing baffling mystifying enigmatic cryptic obscure abstruse recondite esoteric arcane occult mysterious unknown unfamiliar strange odd peculiar curious queer weird bizarre fantastic extraordinary remarkable notable noteworthy significant important momentous consequential weighty grave serious crucial vital essential necessary required needed wanted desired wished hoped expected anticipated awaited looked-for searched-for sought hunted pursued chased tracked trailed followed shadowed stalked crept crawled climbed scaled ascended mounted rose lifted elevated raised hoisted heaved hauled pulled tugged dragged drawn attracted lured enticed tempted seduced charmed enchanted fascinated captivated engrossed absorbed immersed involved engaged occupied busy active energetic dynamic vigorous forceful powerful strong mighty potent effective efficient productive fruitful fertile fecund prolific abundant plentiful ample sufficient adequate enough satisfactory acceptable tolerable bearable endurable sustainable maintainable manageable controllable governable rule govern reign dominate command direct lead guide steer pilot navigate drive propel push thrust shove press squeeze compress condense concentrate aim point target zero align adjust tune calibrate level equalize standardize normalize stabilize fix secure anchor moor dock land touch-down alight perch roost nest den burrow tunnel dig excavate mine quarry extract remove eliminate eradicate exterminate destroy demolish ruin wreck damage harm injure hurt wound maim cripple lame disable incapacitate paralyze stun shock astonish amaze astound stagger stupefy daze bewilder confuse puzzle perplex baffle mystify enigma