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For Insects, Spiders & Their Kin
For the United States & Canada
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Genus Agabus

Predaceous Diving Beetle - Agabus antennatus - male Agabus infuscatus Aube - Agabus infuscatus Diving Beetle under rock - Agabus Agabus kootenai (Larson) - Agabus kootenai - female Agabus antennatus Leech - Agabus antennatus - male Agabus ancillus (Fall) - Agabus ancillus - male Agabus arcticus (Paykull) - Agabus arcticus - male Agabus semipunctatus - male
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Adephaga
Family Dytiscidae (Predaceous Diving Beetles)
Subfamily Agabinae
Tribe Agabini
Genus Agabus
Explanation of Names
Agabus Leach 1817
51 spp. in our area, >170 spp. in 3 subgenera total(1)(2)
5-14 mm
primarily Holarctic, with a few spp. in SE Asia and Subsaharan Africa (at high altitudes)(1)
from vegetation-rich permanent ponds to lotic environments (streams and rivers); some also occur in temporary pools, others inhabit barren, mineral-rich aquatic environs in the arctic and alpine zones(3)
aquatic insects
Life Cycle
most overwinter as adults with breeding, egg laying and immature stages occuring in spring and summer; others may overwinter as larvae and/or eggs(3)