Sunburst Diving Beetle
Thermonectus marmoratus
In a shallow, sun-lit pool in Fish Creek Canyon, Superstition Mts., Pinal Co., Arizona. 31 Aug. 2014.
Dytiscidae -- Diving Beetle Family
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Naturalists will find flecks of gold that swim and devour mosquitoes in the shallow pools of riparian canyons in the Sonoran Desert. The streamlined bodies, 8 to 12mm in length, are encased in hardened elytra that also serve as an aquatic lung by capturing a bubble of air in the space above the abdomen.