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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 nitrogen-cycle phosphorus-cycle sulfur-cycle oxygen-cycle hydrogen-cycle biogeochemical-cycle nutrient-cycle trophic-pyramid food-chain ecological-network interaction-web mutualistic-network antagonistic-network competition-network facilitation-network ecosystem-function ecosystem-process provisioning-service regulating-service cultural-service supporting-service habitat-service refuge nursery corridor stepping-stone buffer-zone core-area periphery matrix patch landscape seascape riverscape skyscape soundscape smellscape tastescape touchscape mindscape dreamscape memoryscape heritagescape futurescape possibility-space scenario-space decision-space policy-space governance-space institutional-space social-space cultural-space economic-space political-space legal-space ethical-space moral-space spiritual-space sacred-space profane-space liminal-space transitional-space threshold boundary edge frontier margin center core hinterland heartland homeland motherland fatherland native-land 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 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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 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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 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