Datana perfusa

Adult Datana moths are typically stout-bodied with cryptic brown or gray coloration that provides camouflage against tree bark. The genus can be challenging to identify to species level based on adults alone; genitalic examination is often required for definitive identification. Larvae of Datana species are more readily recognized: they possess distinctive longitudinal stripes, often in black, yellow, and white, with prominent tufts of setae. When disturbed, Datana caterpillars characteristically raise their head and tail ends in a U-shaped defensive posture, a behavior shared with other notodontid larvae. D. perfusa is reportedly among the larger species in the genus, consistent with its common name.

Associated with hardwood forests and woodlands, particularly those containing oak species (Quercus). The genus Datana is found in deciduous and mixed forest habitats where host trees are abundant.

Native to North America. The genus Datana ranges across much of the eastern and central United States, with some species extending into southern Canada and Mexico. Specific distribution records for D. perfusa are sparse, but the species has been documented in the southwestern United States including Arizona.

Adults are active during the warmer months, typically late spring through summer. Larvae are present in summer and early fall, with the genus being noted as late-season defoliators.

Larvae feed on leaves of hardwood trees, particularly oaks (Quercus spp.). The genus Datana is documented as feeding on Fagaceae, with specific host associations varying by species.

• Quercus - larval foodplantoaks

Complete metamorphosis with egg, larva, pupa, and adult stages. Females deposit eggs on host plant foliage. Larvae feed gregariously in early instars, often skeletonizing leaves; later instars may feed individually and consume entire leaves. Mature larvae descend to the ground to pupate in soil or leaf litter, where they overwinter. Adults emerge the following season.

Larvae are gregarious, particularly in early instars, feeding in groups that can cause localized heavy defoliation. When disturbed, larvae adopt a characteristic U-shaped defensive posture with head and tail raised. This behavior, combined with aposematic coloration, likely serves as a warning to predators. Adults are nocturnal and attracted to light.

As a folivore, larvae function as primary consumers in forest ecosystems. Their late-season feeding typically has minimal impact on overall tree health, as most photosynthesis has already occurred. They serve as prey for various parasitoids, predators, and insectivorous birds.

Larvae can cause noticeable defoliation of ornamental and shade trees, occasionally attracting public concern. However, late-season defoliation by Datana species is generally not economically damaging to forest health. Management is rarely necessary; when warranted, mechanical removal of larvae or targeted insecticide applications may be used.

• Datana integerrimaWalnut caterpillar, similar larval morphology and behavior; distinguished by host association (Juglans vs. Quercus) and subtle differences in adult genitalia
• Datana ministraYellow-necked caterpillar, overlaps in range and host use; larvae have more pronounced yellow coloration on the neck region
• Anisota senatoriaOrangestriped oakworm, similar late-season oak defoliator with gregarious larvae; distinguished by orange stripes and lack of prominent setal tufts
• Symmerista spp.Related notodontid moths with similar larval defensive posture; often require examination of adult genitalia or larval host specificity for separation

• defoliator
• oak-feeder
• gregarious larvae
• warning coloration
• notodontidae
• phalerinae
• forest pest
• late-season feeder
• U-posture defense
• prominent moth

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Insects and mites that feed on leaves - AgriLife Extension Entomology
• Bug Eric: Wasp Wednesday: Ammophila procera
• Much Ado About Nothing? End-of-Summer Defoliation Heats Up
• Bug Eric: November 2010
• 2018 Arizona Insect Collecting Trip “iReport” | Beetles In The Bush