Thermonectus marmoratus
| Sunburst Diving Beetle | |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Coleoptera |
| Suborder: | Adephaga |
| Family: | Dytiscidae |
| Genus: | Thermonectus |
| Species: | T. marmoratus |
| Binomial name | |
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Thermonectus marmoratus Gray, 1832 |
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Thermonectus marmoratus is a species of diving beetle known by the common names sunburst diving beetle and spotted diving beetle. The beetle has recently become notable when it was discovered that its aquatic larval stage has been found to have used in its principal eyes two retinas and two distinct focal planes that are substantially separated, in the manner of bifocals to switch their vision from up-close to distance, for easy and efficient capture of their prey, mostly mosquito larvae. This is the first ever recorded use of bifocal technology in the animal world.
The adult beetle reaches a maximum length of about one centimeter, or half an inch, with females slightly larger than males. The sunburst diving beetle has a black and streamlined carapace covered with bright yellow or golden spots. The male has a suction disk on each foreleg.
Sunburst diving beetles live in ponds and lakes and swim well. When their water source dries up they will fly to a new one.
Sunburst diving beetles are found in extreme Southern California, Arizona, New Mexico, Texas, and Mexico, requiring at least a temporary water source. Seen in Moab, Utah.
In the wild, these beetles are useful because they eat other invertebrates including mosquito larvae and pupae. Spotted diving beetles have also been observed swarming a prey item and feeding en masse. In captivity, these beetles will feed on flake fish food and live crickets.
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Wikipedia