Micromus posticus

Micromus posticus can be distinguished from similar brown lacewings by two key wing venation characters: the inner gradate veins on the forewing are separated by a distance less than or equal to their length, and the face lacks conspicuous markings. These traits require examination of the wing under magnification. The species is smaller than many green lacewings (Chrysopidae), and lacks the bright green coloration typical of that family. Accurate identification to species level within Micromus typically requires reference to specialized keys and examination of genitalic characters.

Adults measure 7–9.5 mm from head to wingtip. Adults are macropterous (fully winged). The forewing has inner gradate veins separated by a distance less than or equal to their length. The face lacks conspicuous markings. Like other brown lacewings, adults are generally brown in coloration, though they may appear more reddish or pinkish in autumn and spring.

Found in diverse environments where aphid prey occurs, including forests, agricultural areas, and suburban gardens. Adults overwinter and become active in early spring. Has been observed at blacklights in residential yards, indicating presence in human-modified landscapes. Specific microhabitat preferences for larvae are poorly documented but likely include vegetation with aphid colonies.

Caribbean, Central America, and North America. Documented from the eastern United States (including Vermont) through the Caribbean and into Central America. The species has been recorded as far north as the northeastern United States.

Adults are active year-round in warmer regions, with winter survival as adults. In temperate North America, adults become active in early spring (March–April), with observations at blacklights beginning in mid-March. Activity continues through the growing season. The species likely has multiple generations per year in warmer parts of its range, though specific phenology is poorly documented.

Both larvae and adults are predatory, feeding on aphids. The species is an aphid predator throughout its life stages.

Eggs, larval, pupal, and adult stages occur. Larvae are predatory on aphids. Adults overwinter, becoming active in early spring. Specific details of developmental duration, number of generations, and overwintering site selection are not well documented in available sources.

Adults are nocturnal and attracted to ultraviolet and mercury vapor lights. They are active predators, hunting aphids on vegetation. Adults overwinter and resume activity in early spring when temperatures permit. Both life stages are predatory.

Functions as a biological control agent of aphid populations. As a generalist aphid predator, it may help suppress pest aphid outbreaks in natural and agricultural ecosystems. Its role in food webs includes consumption of herbivorous insects (aphids) and likely serves as prey for larger predators such as birds and other insects.

Potentially beneficial in agriculture and horticulture due to aphid predation. May contribute to natural biological control of aphid pests without human intervention. Not known to be a pest or to have negative impacts on human activities. Occasionally encountered by citizen scientists during blacklighting activities.

• Micromus variegatusAnother brown lacewing in the same genus; requires examination of wing venation and genitalia for separation
• Hemerobius stigmaBrown pine lacewing in the same family; differs in host associations and wing venation patterns
• Chrysoperla speciesGreen lacewings are larger, bright green, and in a different family (Chrysopidae); easily distinguished by color and size

• Neuroptera
• Hemerobiidae
• brown lacewing
• aphid predator
• biological control
• nocturnal
• blacklight attractant
• North America
• Caribbean
• Central America

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Bug Eric: Blacklighting Already?
• Reuse of science for the benefit of all: the beauty of open access | Blog
• Pensoft blog - Part 136
• Life History of Micromus Posticus Walker1