Genus Thermonectus

Classification · Explanation of Names · Numbers · Size · Identification · Range · Habitat · Life Cycle · Works Cited

Aquatic beetle - Thermonectus basillaris

Dytiscidae? maybe Eretes sp. - Thermonectus sibleyi

Sunburst Diving Beetle - Thermonectus marmoratus

T. n. nigrofasciatus - Thermonectus nigrofasciatus

Water beetle - Thermonectus basillaris - male

Classification

Kingdom Animalia (Animals)

Phylum Arthropoda (Arthropods)

Subphylum Hexapoda (Hexapods)

Class Insecta (Insects)

Order Coleoptera (Beetles)

Suborder Adephaga (Ground and Water Beetles)

Family Dytiscidae (Predaceous Diving Beetles)

Subfamily Dytiscinae

Tribe Aciliini

Genus Thermonectus

Explanation of Names

Thermonectus Dejean 1833

Numbers

6 spp. in our area, 20 total(1)(2)

Size

7.5-14 mm(3)

Identification

elytron densely punctate but punctures fine and inconspiciuous, AND mesofemur with hind margin setae longer than width of femur(4)

Range

New World, mainly warm temperate to tropical; T. basilaris strays as far north as so. ON(3)

Habitat

Mostly in ponds, both permanent and vernal; 2 spp. in desert streams; come to lights(3)

Life Cycle

adults reported to overwinter on land, breeding in late spring to early summer, larvae develop quickly over the summer, especially in desert regions(3). Newly emerged adults disperse to overwintering sites in late summer and into the fall.

Works Cited

1.	A World Catalogue of the Family Dytiscidae, or the Diving Beetles (Coleoptera, Adephaga) Nilsson and Hajek. 2019. Distributed by authors.

2.	The Water Beetles of Florida Epler J.H. 2010. Florida Department of Environmental Protection. Tallahassee. 414 pp.

3.	Predaceous Diving Beetles (Coleoptera: Dytiscidae) of the Nearctic Region, with emphasis on the fauna of Canada and Alaska D.J. Larson, Y. Alarie, and R.E. Roughley. 2001. NRC 43253.

4.	American Beetles, Volume I: Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia Arnett, R.H., Jr., and M. C. Thomas. (eds.). 2000. CRC Press LLC, Boca Raton, FL.

Contributed by Sean McCann on 28 August, 2006 - 3:09pm
Additional contributions by Robin McLeod, Mike Quinn, Tim Moyer, t.loh, v belov
Last updated 5 June, 2023 - 5:16pm

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