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Pemphigus Obesinymphae, a New American Aphid Species with Defenders and Swollen Nymphs (Homoptera: Aphidoidea: Pemphigidae)

Shigeyuki Aoki and Nancy A. Moran
Journal of the New York Entomological Society
Vol. 102, No. 2 (Apr., 1994), pp. 251-260
Stable URL: http://www.jstor.org/stable/25010079
Page Count: 10
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Pemphigus Obesinymphae, a New American Aphid Species with Defenders and Swollen Nymphs (Homoptera: Aphidoidea: Pemphigidae)
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Abstract

Pemphigus obesinymphae, n. sp., which is closely allied to P. populitransversus Riley, was discovered in Arizona and Utah and is described here. The new species forms galls on leaf petioles of Populus fremontii Watson, and produces 1st instar nymphs that possess heavy sclerotization and stout legs. The 2nd and 3rd instar nymphs are swollen and look superficially like wingless adults. The fundatrix, the 1st instar, 2nd instar and adult (alate) fundatrigeniae, the 1st instar exule deposited by the alate, the sexupara, and the gall are described. The differences found between the new species and the most similar previously described species, P. populitransversus and P. knowltoni Stroyan, are given.

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