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Genus Agabus

Predaceous Diving Beetle - Agabus griseipennis - male Agabus bicolor Kirby - Agabus bicolor Agabus clavicornis Sharp - Agabus clavicornis - male Agabus erytropterus (Say) - Agabus erytropterus - male Agabus phaeopterus (Kirby) - Agabus phaeopterus - male Agabus phaeopterus (Kirby) - Agabus phaeopterus - male Agabus phaeopterus (Kirby) - Agabus phaeopterus - male Agabus tristis Aubé - Agabus tristis - female
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 Agabinae
Genus Agabus
Explanation of Names
Agabus was an early follower and prophet of Christianity during the 1st century AD. See here for more info.
Author: Leach (1817)
Numbers
Large and diverse holarctic genus; North America: 106 species (1)
Size
5-12.5 mm
Identification
Adults:
Eyes notched at antennal bases
Row of setae present on the ventral posterior apical angle (point where tibia and femur meet) of the hind femur
Hind tarsal claws subequal in length (compared to unequal claws in Ilybius)
Males can be separated from females by the broadly expanded front tarsi, which also bear numerous adhesive setae.
Species identification is often difficult given the large number of species in the genus and close similarities in appearance between species. However, there are a few exceptions that can be easily identified by colour alone. Examination of male specimens is often most reliable for species ID.
Larvae: similar in appearance to Ilybius larvae
2 whorls of hair on cerci (urogomphi) with or without secondary setae
lateral sides of the head without horizontal keel; row of lateral head spines do not meet the eye but run in an oblique angle below it (unlike Ilybius)
Range
Continent-wide in North America, more diverse in the northern regions
Habitat
Various freshwater habitats- 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 (1)
Food
Both adults and larvae are predaceous on smaller aquatic insects
Life Cycle
Various; most have been reported to overwinter as adults with breeding, egg laying and immature stages occuring in spring and summer but others may overwinter as larvae and/or eggs. (1)
See Also
Print References
For keys, full descriptions of biology and ecology, and range information for all known North American Agabus species see:
Larson DJ, Y. Alarie, and RE Roughley. 2000. Predaceous Diving Beetles (Coleoptera: Dysticidae) of the Nearctic Region, with emphasis on the fauna of Canada and Alaska. pp. 481-694.
Internet References
MCZ: Excellent images of pinned specimens representing 33 species
Discover Life in America: images and descriptions of several species