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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 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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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