Thermonectus sibleyi

{{Short description|Species of beetle}}

{{Speciesbox

| image =

| genus = Thermonectus

| species = sibleyi

| authority = Goodhue-McWilliams, 1981

}}

Thermonectus sibleyi is a species of diving beetle native to western Mexico and southern Arizona, United States. T. sibleyi reaches a total length of {{convert|11.4|to|13.8|mm|in}} and has an overall light, speckled color pattern.{{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}}{{cite journal |first=Kenneth L. |last=Goodhue-McWilliams |title= Two new species of Thermonectus (Coleoptera: Dytiscidae) from southwestern United States and western Mexico |journal=The Coleopterists Bulletin |volume=35 |issue=4 |year=1981 |pages=399–407}}