Nysius aa

{{short description|Species of Wēkiu bug}}

{{Speciesbox

| image = 2017-Nysius аа.jpg

| taxon = Nysius aa

| authority = 1996

}}

Nysius aa is a species of wēkiu bug (a type of seed bug in the genus Nysius) endemic to the area around the summit of Mauna Loa, on the island of Hawai{{okina}}i.{{cite web

| url =http://www.malamamaunakea.org/library/reference/index/refid/1276-nysius-aa-heteroptera-lygaeidae-a-new-species-of-micropterous-wekiu-bug-from-the-summit-of-mauna-loa-volcano-hawaii|title =Nysius AA (Heteroptera: Lygaeidae), a new species of micropterous wekiu bug from the summit of Mauna Loa volcano, Hawaii|publisher=Office of Mauna Kea Management|year=2004|accessdate = 2017-02-01 }} It is closely related to Nysius wekiuicola, which is another species of wēkiu bug endemic to the nearby Mauna Kea.