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Species Pemphigus populicaulis

Pemphigus populicaulis, gall on cottonwood - Pemphigus populicaulis Pemphigus populicaulis & cottonwood gall - Pemphigus populicaulis Pemphigus gall? - Pemphigus populicaulis Pemphigus populicaulis? - Pemphigus populicaulis Pemphigus populicaulis? - Pemphigus populicaulis Pemphigus populicaulis? - Pemphigus populicaulis Pemphigus populicaulis? - Pemphigus populicaulis Cottonwood gall - Pemphigus populicaulis
Classification
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 Aphidoidea
Family Aphididae (Aphids)
Subfamily Eriosomatinae (Woolly Aphids and Gall-making Aphids)
Tribe Pemphigini
Genus Pemphigus
Species populicaulis (Pemphigus populicaulis)
Synonyms and other taxonomic changes
First described in 1859 by Asa Fitch under the name Pemphigus populicaulis
Explanation of Names
populicaulis is from Latin populus, the scientific name for the poplar tree + caulis- "stalk or stem", probably both in the genitive case- thus meaning "of poplar stalks or stems". Fitch gave this species the common name "Poplar-stem Gall-louse", based on the obsolete name of "Plant Lice" for aphids.
Remarks
Causes twisted, subglobular galls with oblique openings at the base of cottonwood (Populus) leaf blades. (1)
Internet References
Works Cited
1.Plant Galls and Gall Makers
Ephraim Porter Felt. 1940. Comstock Publishing Company, Inc., Ithaca NY.