Melaphis
Walsh, 1867
staghorn sumac aphid
Melaphis is a of in the , subtribe Melaphidina. The genus contains at least three cryptic in North America: Melaphis rhois (the staghorn sumac aphid), Melaphis asafitchi, and Melaphis minuta. These aphids are notable for inducing on sumac and exhibiting in sexual females.
Pronunciation
How to pronounce Melaphis: //məˈlæfɪs//
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Identification
Distinguishing among within Melaphis requires molecular and morphometric analysis; the three recognized species (M. rhois, M. asafitchi, M. minuta) are cryptic and . The can be recognized by its woolly appearance and -forming habit on sumac.
Images
Habitat
Associated with sumac (Rhus) and moss as . Sexual females migrate to sumac in spring, where offspring induce .
Distribution
North America; records include Ontario and Quebec in Canada, and Vermont and other parts of the United States.
Seasonality
Spring to sumac occurs when sexual females produce offspring that establish .
Diet
Phloem-feeding on sumac (Rhus) and moss as .
Host Associations
- Rhus - primary sumac; induced on this
- moss - secondary in
Life Cycle
Complex involving alternation between sumac and moss . Sexual females are , each producing a single offspring that migrates to sumac and induces a . Within the gall, the proliferates clonally. The exhibits cyclic .
Behavior
Sexual females exhibit , a relatively unusual trait among . on sumac triggers localized clonal proliferation within the protective gall structure.
Ecological Role
formation on sumac creates specialized microhabitats. Low genetic diversity and restricted among suggest limited and localized ecological impact.
Similar Taxa
- SchlechtendaliaBoth belong to subtribe Melaphidina and share -forming habits on sumac; molecular analysis is required for differentiation.
Misconceptions
Melaphis rhois was long considered the sole North representative of Melaphidina; molecular studies revealed at least three cryptic . The name Melaphis minuta cannot be definitively assigned to either M. rhois or M. asafitchi.