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The Adelgidae is a small family of the Hemiptera closely related to the aphids, and often traditionally included in the Aphidoidea with the Phylloxeridae. Adelgids are often known as "woolly conifer aphids". The family is composed of species associated with pine spruce or other conifers, known respectively as "pine aphids" or "spruce aphids". This family includes the former family Chermesidae, or "Chermidae", the name of which was declared invalid by the ICZN in 1955.〔insects being called "chermes" sometimes. Another name that was common was "dreyfusia" in other locations ((''The Balsam Woolly Aphid Problem in Oregon and Washington'' ), Norman E. Johnson and Kenneth H. Wright, Research paper No. 18, United States Forest Service, United States Department of Agriculture, April, 1957).〕 There is still considerable debate as to the number of genera within the family, and the classification is still unstable and inconsistent among competing authors.〔(''A Historical Review of Adelgid Nomenclature'' ), Matthew S. Wallace, Third Symposium on Woolly Hemlock Adelgids〕 There are about fifty species of adelgids known. All of them are native to the northern hemisphere, although some have been introduced to the southern hemisphere as invasive species. Unlike aphids, the adelgids have no tail-like cauda and no cornicles.〔''Bugs of the World'', George C. McGumo, (Facts on File ), 1993, ISBN 0-8160-2737-4〕 Adelgids only lay eggs, and never give birth to live nymphs as aphids do. Adelgids are covered with dense woolly wax. A complete adelgid life cycle lasts two years.〔 Adelgid nymphs are known as sistentes, and the overwintering sistentes are called neosistens.〔page 724 of (''Imms' General Textbook of Entomology'' ), Tenth Edition, volume 2, Augustus Daniel Imms, Richard Gareth Davies, Owain Westmacott Richards, Springer, 1977, ISBN 0-412-15220-7〕 Rain can kill adelgids by dislodging eggs and sistentes from trees.〔(''The Balsam Woolly Aphid Problem in Oregon and Washington'' ), Norman E. Johnson and Kenneth H. Wright, Research paper No. 18, United States Forest Service, United States Department of Agriculture, April, 1957〕 ==Genera== * ''Adelges'' * ''Aphrastasia'' * ''Cholodkovskya'' * ''Dreyfusia'' * ''Eopineus'' * ''Gilletteella'' * ''Pineus'' * ''Sacchiphantes'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Adelgidae」の詳細全文を読む スポンサード リンク
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