''Pemphigus obesinymphae'' is a species of
gall-forming aphid. It creates galls on the leaves of ''
Populus fremontii
''Populus fremontii'', commonly known as Frémont's cottonwood, is a cottonwood (and thus a poplar) native to riparian zones of the Southwestern United States and northern through central Mexico. It is one of three species in ''Populus'' sect ...
''.
The species is the only North American aphid known to have soldiers, first
instar
An instar (, from the Latin '' īnstar'', "form", "likeness") is a developmental stage of arthropods, such as insects, between each moult (''ecdysis''), until sexual maturity is reached. Arthropods must shed the exoskeleton in order to grow or ...
nymphs that defend the colony.
References
Eriosomatinae
Hemiptera of North America
Insects described in 1994
{{Aphididae-stub