Chrysoperla

Separation from similar green lacewing genera requires examination of male genitalia, specifically the combination of arcuate tignum, lack of gonapsis, and presence of spinellae on the gonosaccus. Wing venation provides additional characters: the short intramedian cell that does not overlap the first crossvein from the radial sector. Species-level identification within Chrysoperla is particularly challenging as many species are morphologically identical; reliable separation often requires analysis of species-specific vibrational courtship songs produced by abdominal vibration against substrates, or examination of male genitalia details. DNA barcoding and mitochondrial haplotype analysis are increasingly used to distinguish cryptic species, particularly within the C. carnea species complex which contains at least 20 species and multiple undescribed 'song species'.

Adults have delicate bodies with large, transparent, highly-veined wings held roof-like over the body. A pale yellowish stripe runs down the middle of the body. The short intramedian cell (im) in the wing does not overlap the first crossvein from the radial sector. Coloration varies seasonally; adults may appear brown, pink, or reddish in autumn and spring rather than bright green. Male genitalia contain diagnostic features: an arcuate tignum, absence of gonapsis, and presence of spinellae on the gonosaccus. Larvae are alligator-like with prominent sickle-shaped mandibles and lack the debris-carrying behavior seen in some other chrysopid genera.

Found in diverse terrestrial habitats including agricultural landscapes, gardens, forests, and arid regions. Adults overwinter in sheltered locations. Specific habitat associations vary by species; for example, Chrysoperla zastrowi is adapted to hot, arid environments while other species occupy more mesic conditions. Agricultural fields and greenhouse environments are common habitats due to abundant aphid prey.

Cosmopolitan distribution with particular abundance in Europe and North America. The genus occurs across temperate and tropical regions globally. Chrysoperla zastrowi, originally Afro-Eurasian, has naturalized in the southwestern United States, Mexico, and Guatemala within the last 10-15 years. The C. carnea species complex has a holarctic distribution.

Adults are active during warmer months with activity patterns varying by latitude and species. Many species overwinter as adults, becoming active in early spring when temperatures permit. In temperate regions, adults may be found from March through autumn, with peak activity in summer. Some species show bivoltine or multivoltine life cycles with multiple generations per year.

Larvae are predatory, feeding on aphids, mites, and other soft-bodied insects and their eggs. Adults of some species feed on honeydew, nectar, and pollen; others may supplement with prey. Laboratory rearing has utilized artificial diets including milk, eggs, fruit, sugar, yeast, and wheat germ for adult maintenance.

Holometabolous development with egg, larva, pupa, and adult stages. Eggs are laid on stalks, typically attached to vegetation. Larvae pass through three instars before pupating in silken cocoons. Duration of developmental stages varies with temperature and species. Some species overwinter as adults; others may have diapausing egg stages. Cannibalism among larvae can occur under crowded conditions.

Adults produce species-specific vibrational courtship songs by vibrating their abdomens against leaves or twigs, creating substrate-borne signals. Males and females engage in duetting behavior, with either sex initiating and the other responding; successful matching of songs leads to copulation. These songs are inaudible to humans without specialized equipment. Adults are attracted to light and may be collected at blacklights. They are active hunters, seeking aphid colonies to oviposit near.

Important biological control agents in natural and agricultural ecosystems. Larvae function as predators of aphids, mites, and other soft-bodied herbivores, contributing to regulation of pest populations. Adult feeding on nectar and pollen may provide minor pollination services. The genus is among the most widely used natural enemies in augmentative biological control programs globally.

Widely used in biological pest control in greenhouses and field crops. Commercial insectaries rear multiple species for sale as biocontrol agents, particularly for aphid management. The historical conflation of multiple cryptic species under the name 'Chrysoperla carnea' has complicated biocontrol efficacy, as species vary in climatic suitability and prey preferences. Recent recognition of species-specific climatic adaptations, such as C. zastrowi's suitability for hot, arid regions, offers potential for improved matching of biocontrol agents to target environments. Some species harbor specialized gut yeasts (Metschnikowia chrysoperlae, Candida picachoensis, Candida pimensis) that may be transmitted vertically.

• ChrysopaHistorically confused with Chrysoperla; distinguished by presence of gonapsis in male genitalia and different wing venation patterns
• AtlantochrysaFormerly included Chrysoperla as a subgenus; separated by genitalic and larval characteristics
• Other Chrysopini generaShare green lacewing general morphology but differ in male genitalia structure, particularly the combination of arcuate tignum, absence of gonapsis, and presence of spinellae on gonosaccus that define Chrysoperla

The name 'Chrysoperla carnea' was historically applied to a supposedly single holarctic species, but research since the 1990s has revealed this to be a complex of at least 20 cryptic species distinguishable primarily by vibrational songs and subtle morphological or genetic differences. Commercial biocontrol products labeled as C. carnea may contain multiple species with different ecological requirements, potentially reducing efficacy in target environments.

• biological control
• predator
• green lacewing
• vibrational communication
• cryptic species
• aphid predator

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Primary Type List | Entomology Research Museum
• Drought-Tolerant, Aphid-Hungry Lacewing Species Arrives in Americas
• Bug Eric: Last Night to Blacklight?
• Sulfoxaflor Found to Be Less Harmful to Beneficial Predators of Soybean Aphids
• Stories about small insects and making a big difference - Buglife Blog - Buglife
• Bug Eric: Blacklighting Already?
• Rearing of the common green lacewing, Chrysoperla carnea Stephens, in the laboratory Gojenje navadne tenčičarice (Chrysoperla carnea Stephens) v laboratorijskih razmerah
• Life History Comparison of Two Green Lacewing SpeciesChrysoperla johnsoniandChrysoperla carnea(Neuroptera: Chrysopidae)
• Metschnikowia chrysoperlae sp. nov., Candida picachoensis sp. nov. and Candida pimensis sp. nov., isolated from the green lacewings Chrysoperla comanche and Chrysoperla carnea (Neuroptera: Chrysopidae)
• A Thermo-Sensitive Molecular Switch: Pyrexia-1 Dynamically Regulates Low-Temperature Adaptation in Chrysoperla nipponensis.