Abstract
Here we present a review of the 18 species of the Macrosiphini genus Macrosiphoniella (Hemiptera: Aphididae) known to occur in the United States of America, representing two subgenera, Macrosiphoniella and Phalangomyzus Börner, 1939. We report key features for all species including colour in life and pigmentation on slides of apterous and alate viviparous females of all 18 species. Distributional data, host plants, and biological notes of the reviewed species are presented. Apterous, alate and oviparous females of a new native USA species, Macrosiphoniella sunshine sp. nov., associated with Eriophyllum lanatum (Asteraceae) are described from specimens collected in California, Oregon, and Washington. Keys to apterous and alate viviparous females of the Macrosiphoniella in the USA are also provided. http://zoobank.org/urn:lsid:zoobank.org:pub:A15D7190-8E74-4AC6-84B2-6B8AE9A4454C http://zoobank.org/urn:lsid:zoobank.org:act:3C3FA8B4-9EA5-4F09-ABF0-31EDC3826E13
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