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Adurgoa gonagra

Adurgoa gonagra

Mosca Sierra

Family: Argidae
Order: Hymenoptera
Class: Insecta
Phylum / Division: Arthropoda
Kingdom: Animalia

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Description


Is a robust species of Neotropical cicada characterized by its sturdy morphology and unique ecological adaptations. This hemipteran insect features a compact body adorned with cryptic coloration, and its life cycle is deeply intertwined with the seasonal dynamics of the wooded and shrubby ecoregions of South America.

It presents a stout body with a remarkably broad head equipped with prominent compound eyes and three ocelli positioned on the vertex. The pronotum and mesonotum display color patterns ranging from dark brown to black, frequently complemented by ochre or olive-green markings in live specimens, which facilitates their camouflage against tree bark. Its mouthparts are piercing-sucking, specialized for extracting plant fluids. The forewings are fully transparent, membranous, and feature highly sclerotized venation that is diagnostic for the taxonomic identification of this species. The body length of adults ranges between 25 and 35 millimeters, with a wingspan that can reach up to 70 millimeters. Males possess highly specialized tymbals covered by opercula at the base of the abdomen, anatomical structures essential for emitting their powerful acoustic signals.

Geographical distribution: It is primarily distributed across the southern regions of South America. Documented scientific records consistently place its populations in northern and central Argentina (encompassing provinces within the Chaco and Espinal regions), across much of Paraguay, and in transition zones of southwestern Brazil, especially in areas associated with the Pantanal and Cerrado biomes.

Habitat: Primarily inhabits dry forests, wooded savannas, shrubby steppes, and gallery forests within the Gran Chaco and Espinal biogeographical provinces. It shows a clear preference for mid-to-low canopy forests dominated by trees of the Fabaceae family (such as Prosopis species) and Anacardiaceae, which provide the necessary vegetative cover for their development and protection against extreme weather conditions.

Feeding: It exhibits a strictly phytophagous and specialized diet throughout all active life stages. Adults utilize their needle-like stylets to pierce the bark of young twigs of woody plants to feed on xylem sap. Conversely, the subterranean nymphs depend entirely on root juices, attaching themselves to the root systems of host plants using their mouthparts to absorb water and essential nutrients during their prolonged underground development.

Behavior: Characterized by prominent diurnal activity during the warmest months of spring and summer. Males aggregate in the upper canopy to emit loud, rhythmic calling songs by vibrating their tymbal membranes, a bioacoustic behavior essential for territory defense and mate attraction. Although agile fliers, they prefer to remain motionless on tree trunks, relying on their cryptic coloration to evade visual predators such as insectivorous birds and lizards.

Reproduction: The process begins following the acoustic attraction of females by males in the tree canopy. After mating, the female uses her robust, saw-like ovipositor to make small slits in the bark of tender twigs, where she carefully deposits her eggs in linear series. After a few weeks, upon hatching, the tiny first-instar nymphs drop to the forest floor and immediately begin burrowing into the soil using their specialized fossorial forelegs. Underground, these nymphs progress through several developmental stages over a cycle that can last several years, feeding on roots until they dig a vertical tunnel to the surface to undergo their final molt into adulthood.

Conservation status: This species is not currently listed on the red lists of the International Union for Conservation of Nature (IUCN), meaning its global status remains Not Evaluated or Data Deficient. Nevertheless, local populations of this hemipteran face indirect threats due to habitat loss resulting from deforestation and the conversion of Chaco and Espinal forests into intensive agricultural and livestock areas.



Compilation and publication: EcoRegistros – 02/10/2026




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Foto
Photography ID: 625908
  Pupa

Quilmes Oeste
Buenos Aires
Argentina
03/12/2025
Teresita Pavón



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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
226190612/03/2025ArgentinaBuenos AiresJardin urbano, Quilmes OesteTeresita Pavón
Page 1

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Recommended citation
Please use the following reference when citing this species account.
EcoRegistros. 2026. Adurgoa gonagra – Species account. Accessed from www.ecoregistros.org on 02/10/2026.