Editing Aphid (section)

===Taxonomy===
Late 20th-century reclassification within the Hemiptera reduced the old taxon "Homoptera" to two suborders: [[Sternorrhyncha]] (aphids, whiteflies, [[scale insect|scales]], [[Psylloidea|psyllids]], etc.) and [[Auchenorrhyncha]] ([[cicada]]s, [[leafhopper]]s, [[treehopper]]s, [[planthopper]]s, etc.) with the suborder [[Heteroptera]] containing a large group of insects known as the [[true bugs]]. The infraorder Aphidomorpha within the Sternorrhyncha varies with circumscription with several fossil groups being especially difficult to place but includes the Adelgoidea, the Aphidoidea and the Phylloxeroidea.<ref>{{cite book |url=https://archive.org/stream/fundamentalsofpa09rohd#page/267/mode/1up|pages=267–274 |title=Fundamentals of Paleontology. Volume 9. Arthropoda, Tracheata, Chelicerata |editor=Rohdendorf, B. B. |year=1991 |publisher=[[Smithsonian Institution]] and [[National Science Foundation]]}}</ref> Some authors use a single superfamily Aphidoidea within which the [[Phylloxeridae]] and Adelgidae are also included while others have Aphidoidea with a sister superfamily Phylloxeroidea within which the Adelgidae and Phylloxeridae are placed.<ref>{{cite book |pages=27–31 |title=Encyclopedia of Insects |chapter=Aphids |editor1=Resh, Vincent H.|editor2=Cardé, R. T. |edition=2 |publisher=Academic Press |year=2009 |author=Sorensen, J. T.}}</ref> Early 21st-century reclassifications substantially rearranged the families within Aphidoidea: some old families were reduced to subfamily rank (''e.g.'', [[Eriosomatidae]]), and many old subfamilies were elevated to family rank. The most recent authoritative classifications have three superfamilies Adelgoidea, Phylloxeroidea and Aphidoidea. The Aphidoidea includes a single large family [[Aphididae]] that includes all the ~5000<ref name="Zyla2017"/> extant species.<ref name="ASF">{{cite web |url=http://aphid.speciesfile.org/Common/basic/Taxa.aspx?TaxonNameID=1159459 |title=Superfamily Aphidoidea, Latreille, 1802 |publisher=Aphid: species file |access-date=3 February 2018 |archive-date=6 November 2017 |archive-url=https://web.archive.org/web/20171106005419/http://aphid.speciesfile.org/Common/basic/Taxa.aspx?TaxonNameID=1159459 |url-status=live }}</ref>