Quesada gigas

Distinguished from other cicadas by its exceptionally large size (body up to 50 mm), making it one of the largest cicadas in the Americas. The genus Quesada contains only two species; Q. gigas is the more widespread and larger of the two. In regions where it overlaps with other large cicadas, size and geographic range are key distinguishing features. The large, robust exuviae can serve as an indicator of presence.

One of the largest cicada species in the Americas, with body length up to 50 mm (approximately 2 inches). The cast exuviae are notably large and robust. Adults presumably exhibit typical cicada morphology with large compound eyes, membranous wings held rooflike over the body, and prominent tymbal organs for sound production in males.

Tropical and subtropical regions of the Americas, particularly in agricultural landscapes including coffee plantations and paricá reforestation plantations. Also found in surrounding areas with dry weed vegetation and urban ecosystems. Climate modeling indicates preference for areas with high isothermality and high precipitation during the wettest month.

Native to North, Central, and South America with the widest geographic range of any cicada in the Western Hemisphere. Documented from the United States (southern regions) through Mexico, Central America, and throughout South America including Brazil (Minas Gerais, São Paulo, Pará, Maranhão, Mato Grosso, Mato Grosso do Sul, Acre, Alagoas, Amapá, Amazonas), with high climatic suitability in southeastern Brazil. Climate models suggest potential suitable areas in Africa, Asia, and Oceania, though no confirmed records exist outside the Americas.

Emergence period occurs at the beginning of the rainy season. Adults active during warmer months; in Argentina, observed during March (late summer). Nymphal development spans multiple years (semivoltine), with overlapping generations present in the soil.

Nymphs feed on sap from roots of host plants, constructing underground galleries and remaining there throughout development. Adults possess piercing-sucking mouthparts typical of Hemiptera; specific adult feeding habits not documented in sources but presumed to involve xylem or phloem sap from woody plants.

• Coffea - primary hostcoffee, major pest in Minas Gerais and São Paulo states, Brazil
• Schizolobium parahyba var. amazonicum - primary hostparicá, main pest in commercial plantations in Pará, Maranhão, and Mato Grosso
• Conyza spp. - oviposition site onlynon-host for nymphal development due to annual life cycle

Hemimetabolous development with prolonged nymphal period. Females lay eggs in dry twigs and branches; egg nests average 26.5 eggs (range 16-43) arranged in a double row inclined to the branch axis. Eggs are milky white and fusiform. Upon hatching, nymphs fall to the ground, burrow into soil, and construct single underground galleries at depths of 8-35 cm depending on instar. Nymphs feed continuously on host root sap from within galleries. Development is semivoltine (multi-year, likely 2+ years) with overlapping generations; 4th and 5th instars most commonly encountered in soil samples. Adults emerge at the beginning of the rainy season.

Females exhibit low selectivity in oviposition site choice, using dry branches of non-host plants when suitable hosts are unavailable nearby. Nymphs display gregarious habits with aggregated spatial distribution, clustering in foci due to limited mobility; distribution is not necessarily centered around attacked trees. Males produce species-specific acoustic signals for mate attraction; singing males are alert and difficult to approach.

Significant agricultural pest causing economic damage to coffee and paricá plantations. Estimated up to 20% production loss or premature tree death in severe infestations of paricá; long-standing pest of coffee. Nutrient flux associated with mass emergences documented in urban ecosystems. Low oviposition selectivity may facilitate population persistence in fragmented agricultural landscapes.

Major pest of commercially important crops, particularly coffee and paricá forestry. Management complicated by semivoltine life cycle, overlapping generations, and low oviposition selectivity including use of non-host weeds. Chemical control of nymphs is difficult due to subterranean habit; management strategies must account for alternative oviposition sites in surrounding vegetation.

• Other Quesada speciesGenus contains only two species; Q. gigas distinguished by larger size and much wider geographic range
• Large Tibicen speciesSimilar large size in some North American species, but Q. gigas distinguished by Neotropical distribution and association with coffee/paricá in South America
• Cacama valvataAnother large cicada associated with cacti in western North America; distinguished by host association and geographic range

• agricultural pest
• coffee pest
• semivoltine
• root feeder
• subterranean nymph
• gregarious
• low oviposition selectivity
• climate change model
• Neotropical
• wide distribution

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Cicadidae | Beetles In The Bush | Page 3
• Brazil Bugs #2 | Beetles In The Bush
• Brazil Bugs | Beetles In The Bush | Page 2
• The cyber-centipede: From Linnaeus to big data | Blog
• Spatial distribution and gallery depths of Quesada gigas nymphs in parica plantations
• Oviposition of Quesada gigas in weed no hostess: implication in pest management
• Predicting the Potential Distribution of Quesada gigas Under Current and Future Climate Conditions Using MaxEnt
• Nutrient flux associated with the emergence of Quesada gigas Olivier (Hemiptera: Cicadidae) in an urban ecosystem
• Insecta, Hemiptera, Cicadidae, Quesada gigas (Olivier, 1790), Fidicina mannifera (Fabricius, 1803), Dorisiana viridis (Olivier, 1790) and Dorisiana drewseni (Stål, 1854): first records for the state of Mato Grosso do Sul, Brazil