Synchlora aerata

Adult distinguished from other emerald moths (Geometrinae) by the fine, wavy white lines across the wings rather than straight or angled lines. The combination of small size, emerald green ground color, and wavy white patterning is diagnostic. Larva unmistakable due to its behavior of attaching plant material to dorsal spines; no other North American caterpillar exhibits this precise form of active camouflage. When plant material is removed, the underlying green body with prominent dorsal spines distinguishes it from other loopers.

Found in diverse open habitats including prairies, meadows, fields, gardens, and woodland edges. Associated with areas supporting its host plants, particularly composites (Asteraceae) and other flowering plants. Larvae occur on the host plants themselves, often on flower heads where they attach bits of petals and other floral parts for camouflage.

Widespread across most of North America. Documented from Canada (Alberta, Manitoba, Saskatchewan, southern Ontario, Newfoundland) throughout the United States including the Northeast, Midwest, Southeast, and Southwest. Three recognized subspecies with somewhat different ranges: S. a. aerata in the eastern and central U.S. and southern Ontario; S. a. albolineata from Newfoundland to Alberta and south to Minnesota, Wisconsin, New York, and New England; and S. a. liquoraria from California, Arizona, New Mexico north to British Columbia and Alberta.

Adults active primarily in spring and summer, with timing varying by region. In the Northeast, adults fly from April through October with peak activity in summer. Larvae present during growing season when host plants are available. Overwinters as partially grown larva, resuming feeding in spring before pupation.

Larva feeds on composite flowers (Asteraceae) and various other flowering plants and shrubs. Recorded hosts include Aster, Rudbeckia, Liatris, Solidago, Artemisia, Achillea, Rubus, chrysanthemum, daisy, goldenrod, ragweed, raspberry, rose, sage, St. John's wort, and yarrow. Adult feeding habits not well documented but likely minimal or restricted to nectar.

• Aster - larval food plantNative composite, preferred host
• Rudbeckia - larval food plantBlack-eyed Susan and congeners
• Solidago - larval food plantGoldenrods, abundant late-season host
• Artemisia - larval food plantSage, wormwood
• Achillea - larval food plantYarrow
• Rubus - larval food plantRaspberry, blackberry
• Chrysanthemum - larval food plantOrnamental cultivars

Complete metamorphosis with four stages. Egg laid on host plant foliage or flowers. Larva passes through multiple instars, actively collecting and attaching plant material to dorsal spines for camouflage. Larva overwinters in partially grown state, protected by plant debris camouflage. Development resumes in spring; mature larva pupates in loose cocoon on host plant or in ground litter. Adult emerges, mates, and females lay eggs on suitable host plants. Number of generations per year varies by region, with one to multiple broods possible in warmer areas.

Larva exhibits unique active camouflage behavior: uses silk to attach bits of plant tissue—flower petals, leaves, anthers, or other plant parts—to several large dorsal spines. This material is regularly replaced as the larva moves to new feeding sites, ensuring continuous matching with background vegetation. The camouflage serves dual purpose of concealment from visual predators (particularly birds) and possibly disruption of chemical detection by smaller predators and parasitoids. Larva moves with characteristic looping gait common to Geometridae. When disturbed, may sway gently to enhance illusion of being a plant part moved by wind.

Herbivore consuming flowers and foliage of various plants, with preference for composites. Serves as prey for birds, predatory insects, and parasitoids despite camouflage defenses. Contributes to pollination indirectly through flower feeding and movement between plants. Larval camouflage behavior represents notable example of plant-animal interaction where insect actively manipulates plant material for survival.

Occasional minor pest of ornamental chrysanthemums and other garden flowers, though damage usually limited. More commonly appreciated for its remarkable camouflage behavior, making it a subject of interest for naturalists, photographers, and educators. Adult moth attracted to light. No significant economic impact documented.

• Other Synchlora speciesTwelve species in North America; S. aerata is the only widespread eastern species. Other species restricted to Southeast or Southwest, requiring range and subtle wing pattern differences for separation.
• Other Geometrinae (emerald moths)Share green coloration but differ in wing pattern—most have straight or angled lines rather than wavy pattern of S. aerata. Size and precise line patterning distinguish adults.
• Other Geometridae larvae (inchworms/loopers)Share looping locomotion but lack the dorsal spines and active camouflage behavior with plant material attachment. S. aerata larva unique in this regard.

• camouflage
• looper
• inchworm
• emerald moth
• plant-animal interaction
• active camouflage
• composite feeder
• North American
• Geometridae

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