Thermonectus basillaris

{{Short description|Species of beetle}}

{{Speciesbox

| image = Thermonectus basillaris 5.JPG

| image_caption =

| genus = Thermonectus

| species = basillaris

| authority = Harris, 1829

}}

Thermonectus basillaris is a species of diving beetle native to the eastern United States, southern Ontario, Canada, and Cuba.{{cite journal |first1=Y. |last1=Alarie |first2=Y.S. |last2=Megna |first3=A. |last3=Deler-Hernandez |title=First West Indies records of Thermonectus succinctus (Aubé, 1838), with notes on other Cuban species (Coleoptera: Dytiscidae) |journal=Koleopterologische Rundschau |year=2009 |pages=5–16 |volume=79 |url=http://www.cercyon.eu/Deler/2009_Thermonectus.pdf |accessdate=August 17, 2014 |archiveurl=https://web.archive.org/web/20140819091100/http://www.cercyon.eu/Deler/2009_Thermonectus.pdf |url-status=live |archivedate=August 19, 2014}} T. basillaris is a pioneering species that occurs in temporary ponds and readily fly. Adults are {{convert|8.1|to|10.7|mm|in}} long and {{convert|4.7|to|5.9|mm|in}} wide.{{cite book |first1=D. J. |last1=Larson |first2=Y. |last2=Alarie |first3=R. E. |last3=Roughley |title=Predaceous diving beetles (Coleoptera: Dytiscidae) of the Nearctic Region, with emphasis on the fauna of Canada and Alaska |publisher=Natural Research Council of Canada |year=2000 |isbn=0-660-17967-9}}