Graduate Thesis Or Dissertation
 

Revision of the genus Platylygus (Heteroptera: Miridae)

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9019s494q

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  • The genus Platylygus Van Duzee was erected in 1915 and revised by Kelton and Knight in 1970 describing 26 new species from United State and Mexico. Despite this prior revision, taxonomic problems have been encountered with the use of the keys and in the identification given the close similarity among species. The present study includes a revision of the most important collections in Canada, United States and Canada, limited collecting in the state of Oregon, study of male and female genitalia, analysis of the external morphology, study of host associations and the study of biogeography and a cladistic analysis. In the current revision, five species are synonymized (Platylygus alpinus, P. fuliginosus, P. hirtus, P. intermedius, and P. magnus). Species of this genus are distributed from The Yukon Territory to the south State of Chiapas, Mexico; four in Canada, 14 in the United States, and nine in Mexico. Concentrations of species are found in northwestern California, southeastern Arizona and southwestern New Mexico region, and Central and southwestern Mexico. Of the twenty-six species of Platylygus, 23 are associated with species of Pinus, two with species of Pseudotsuga, two with species Abies, and one with Picea. Twenty-five species of Pinus serve as hosts for these insects from about 82 species of pines known from the American Continent. Previous collecting in Mexico has shown the potential for more species diversity considering the great variety of pines (about 50 species). Limited collecting, particularly in Mexico, points out the need for further research in order to clarify the uncertainty about species only known from a few specimens. Morphological variation among the species of this genus is still poorly understood. The male and female genitalia provide the most definitive tools for species separation. Variation of some characters appears to be more evident in the species present in the southern point of the distribution of the genus. The primary observations of close related genera Proba and Lygus are not definitive and more research is needed to understand the coevolutionary relationships of the genus. The cladistic analysis shows close relationship of most species of the genus except for the species P. vanduzeei, and P. keltoni.
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