Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Family Gyrinidae - Whirligig Beetles

Whirlygig Beetle - Dineutus Water bugs - Dineutus Whirligig Beetle - Gyrinus small Whirligig Beetle - Gyrinus hydrophilidae I think - Dineutus whirligig beetle - Dineutus species ?? - Dineutus emarginatus or americanus?? - First PA Datapoint - Dineutus which dineutus? - First DE Datapoint - Dineutus
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Adephaga (Ground and Water Beetles)
Family Gyrinidae (Whirligig Beetles)
Identification
4 Neartic Genera

Spanglerogyrus - < 3mm (1 sp. South, East)
Gyretes - 3-5mm; pronotal/elytral margins pubescent (4 spp. West, South)
Dineutus - 9-15 mm (41 spp. Widespread)
Gyrinus - 4-7 mm (14 spp Widespread)

That should be all you need to key it out... be sure to give a size when you post something
Print References
America Beetles, Vol. 1, Chapter 7 (1)
Works Cited
1.American Beetles, Volume I: Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia
By Arnett, R.H., Jr., and M. C. Thomas. (eds.)