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Genus Unaspis

Euonymous Scale - Unaspis euonymi - female Euonymous Scale - Unaspis euonymi - male - female Unknown insect on our Golden Euonymus - Unaspis euonymi My Euonymus bushes get covered with these every summer. - Unaspis euonymi - male - female Infested Citrus Tree - Unaspis citri scale - Unaspis euonymi Scales on Euonymus Americana - Unaspis euonymi - female Unaspis euonymi
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hemiptera (True Bugs, Cicadas, Hoppers, Aphids and Allies)
Suborder Sternorrhyncha (Plant-parasitic Hemipterans)
Superfamily Coccoidea (Scales and Mealybugs)
Family Diaspididae (Armored Scale Insects)
Genus Unaspis
Explanation of Names
Author of genus: MacGillivray, 1921
2 species in North America listed at
adult female 1.5-3 mm
adult male about 1 mm
Adult Female: covering brownish-gray, shaped like an oyster shell, broadly rounded posteriorly, tapering to a point anteriorly, with oval prosomal plate; body (only visible with covering removed) yellow, sac-like, pear-shaped, with 5 abdominal segments but no appendages or eyes
Adult Male: covering white, oblong or elongate, with middorsal and two lateral ridges; head yellowish-brown; body (only visible with covering removed) pale orange with wings

Nymph (Crawler): pale yellow to orange with no covering
many areas of the world
in North America, mainly eastern United States and southeastern Canada, but liable to occur anywhere via shipments of cultivated and ornamental plants
on leaves and stems of hostplant
nymphs and adults feed on the sap of leaves - mainly Citrus species in U. citri, and Euonymus species in U. euonymi
Life Cycle
overwinters as a fertilized female; one generation per year in the north, to three or four in the south
Internet References
live adult image of male and female U. euonymi on host plant (U. of California at Davis)
drawings and overview of U. euonymi (North Carolina State U.)
drawings of adult female and male U. citri (Commonwealth Scientific and Industrial Research Organisation, Australia)
diagnosis of genus; PDF doc with detailed description of microscopic anatomy (European and Mediterranean Plant Protection Organization)