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Zelus leucogrammus

Zelus leucogrammus

Chinche Asesina

Family: Reduviidae
Order: Hemiptera
Class: Insecta
Phylum / Division: Arthropoda
Kingdom: Animalia

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Records from Santo Tomé


Description


Characterized by a slender and highly elongated body shape, this true bug belongs to the assassin bug family Reduviidae and measures between 12 and 16 millimeters in length. Its general coloration exhibits a blend of light green, yellowish, and brownish tones, which are strikingly contrasted by distinct white or cream-colored longitudinal stripes running along the lateral margins of the pronotum and abdomen, from which its specific epithet is derived. The head is noticeably elongated and narrowed behind the large, prominent eyes, featuring a robust, three-segmented piercing-sucking mouthpart called a rostrum, which curves downward toward the prosternum. The antennae are long, delicate, and divided into four segments. Its forelegs are slightly thickened and specialized for prey capture, frequently covered with specialized, glandular hairs that produce a sticky, viscous secretion designed to enhance grip during hunting.

Geographical distribution: Occurs widely across the South American continent, with established and well-documented populations in countries such as Brazil, Argentina (particularly in northern and central provinces), Paraguay, Uruguay, and eastern regions of Bolivia. It is particularly common within the Río de la Plata basin and across the vast Chaco ecoregion, where environmental conditions favor its development.

Habitat: Shows a strong preference for the herbaceous and shrub layers of diverse ecological zones, including the Cerrado, temperate transition forests, humid grasslands, and riparian corridors. Additionally, it has adapted remarkably well to agroecosystems, making frequent appearances in agricultural crops (such as soybeans, maize, alfalfa, and cotton), orchards, and suburban gardens where prey populations are dense and vegetation cover is stable.

Feeding: Functions as a highly voracious, generalist predator with strictly zoophagous dietary habits. Its prey spectrum includes a wide variety of soft-bodied arthropods, such as lepidopteran larvae, aphids, phytophagous beetles, thrips, and the nymphs of other hemipterans. During a hunt, it stalks its prey quietly, secures it using its specialized forelegs, and inserts its stylet to inject a complex saliva filled with neurotoxins and proteolytic enzymes. This specialized chemical cocktail rapidly paralyzes the prey and liquefies its internal tissues, allowing the bug to ingest the predigested fluid extraorally.

Behavior: Displays primarily diurnal activity patterns, becoming highly active during the warmest hours of the day. It moves slowly and deliberately through foliage, relying on its pale green coloration as a form of crypsis to remain virtually invisible to both potential prey and larger predators, such as birds or spiders. The hunting strategy is versatile, alternating between sit-and-wait ambush and active foraging on leaves. A notable behavioral adaptation is its use of sticky fluids secreted by dermal glands on its tibiae and femora, which function as an adhesive physical trap to prevent prey from escaping prior to the fatal bite.

Reproduction: Undergoes a hemimetabolous developmental cycle, and its reproductive process is entirely sexual. Mating is preceded by cautious courtship maneuvers, as the male must approach the female with extreme care to avoid being treated as prey due to her larger size. Following successful copulation, the female deposits her eggs in compact masses or clusters glued to the undersides of leaves or green stems. These egg masses are covered with a protective, frothy substance that solidifies quickly, shielding them from environmental desiccation and micro-parasitoids. Upon hatching, the young nymphs emerge, progressing through five distinct instars before reaching adulthood, displaying gregarious tendencies during early stages before dispersing into solitary, territorial hunters.

Conservation status: Has not been evaluated by the International Union for Conservation of Nature (IUCN), meaning it currently lacks an official global conservation rating. However, its populations are widely recognized as stable, resilient, and highly abundant throughout its range. Because it serves as a highly beneficial biological control agent within agricultural matrices, its conservation is naturally supported by integrated pest management practices that restrict the indiscriminate use of broad-spectrum chemical pesticides.



Compilation and publication: EcoRegistros – 18/08/2026




Geographic distribution


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Latest feeding records





Species photographs

Last published photographs

Foto
Photography ID: 447429
  Nymph

Santo Tomé
Santa Fe
Argentina
05/03/2021
Eduardo Beltrocco
Foto
Photography ID: 444035
  Nymph

Santo Tomé
Santa Fe
Argentina
04/30/2021
Eduardo Beltrocco
Foto
Photography ID: 441450
  Nymph

Santo Tomé
Santa Fe
Argentina
04/18/2021
Eduardo Beltrocco
Foto
Photography ID: 439060
  Nymph

Santo Tomé
Santa Fe
Argentina
03/31/2021
Eduardo Beltrocco
Foto
Photography ID: 394196
  Adult

Santo Tomé
Santa Fe
Argentina
02/15/2019
Eduardo Beltrocco
Foto
Photography ID: 391600
 
Santo Tomé
Santa Fe
Argentina
01/06/2020
Eduardo Beltrocco
Foto
Photography ID: 367762
  Nymph

Santo Tomé
Santa Fe
Argentina
06/10/2017
Eduardo Beltrocco
Foto
Photography ID: 359934
♂ ♀
  Adult

Santo Tomé
Santa Fe
Argentina
10/13/2019
Eduardo Beltrocco
Foto
Photography ID: 324417
  Nymph

Santo Tomé
Santa Fe
Argentina
03/28/2019
Eduardo Beltrocco
Foto
Photography ID: 316211
  Adult

Santo Tomé
Santa Fe
Argentina
02/09/2019
Eduardo Beltrocco
Foto
Photography ID: 316210
  Adult

Santo Tomé
Santa Fe
Argentina
02/09/2019
Eduardo Beltrocco
Foto
Photography ID: 211382
  Nymph

Santo Tomé
Santa Fe
Argentina
05/14/2017
Eduardo Beltrocco



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 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
140949003/05/2021ArgentinaSanta FeSarmiento y Centenario, Santo ToméEduardo Beltrocco
140121030/04/2021ArgentinaSanta FeSarmiento y Centenario, Santo ToméEduardo Beltrocco
139476518/04/2021ArgentinaSanta FeSarmiento y Centenario, Santo ToméEduardo Beltrocco
138681431/03/2021ArgentinaSanta FeSarmiento y Centenario, Santo ToméEduardo Beltrocco
123107306/01/2020ArgentinaSanta FeCostanera (iriondo y skate), Santo ToméEduardo Beltrocco
112362413/10/2019ArgentinaSanta FeCostanera (iriondo y skate), Santo Tomé2Eduardo Beltrocco
90220528/03/2019ArgentinaSanta FeSarmiento y Centenario, Santo ToméEduardo Beltrocco
123529015/02/2019ArgentinaSanta FeSarmiento y Centenario, Santo ToméEduardo Beltrocco
88545809/02/2019ArgentinaSanta FeSarmiento y Centenario, Santo ToméEduardo Beltrocco
114726510/06/2017ArgentinaSanta FeHumedal lindante al Rio Salado, Santo ToméEduardo Beltrocco
Page 1

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Recommended citation
Please use the following reference when citing this species account.
EcoRegistros. 2026. Zelus leucogrammus – Species account. Accessed from www.ecoregistros.org on 19/09/2026.