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Family Geocoridae - Big-eyed Bugs

Big eyed bug - Geocoris uliginosus Big-Eyed Bug - Geocoris uliginosus Little red bug Big-eyed bug from Montana 10.07.08 - Geocoris atricolor Geocoris Geocoridae, ventral - Geocoris limbatus Big-eyed Bug? - Geocoris Big-eyed bug - Geocoris
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hemiptera (True Bugs, Cicadas, Hoppers, Aphids and Allies)
Suborder Heteroptera (True Bugs)
Infraorder Pentatomomorpha
Superfamily Lygaeoidea
Family Geocoridae (Big-eyed Bugs)
Synonyms and other taxonomic changes
formerly treated under Lygaeidae
~30 spp. in 2 genera in our area (all in Geocorinae), 275 spp. in 25 genera worldwide; Geocoris, with 25 spp. in NA and ~170 worldwide, is by far the largest genus(1)(2)
ca. 3-5 mm
Habitus distinctive: Body oblong-oval; eyes prominent, dorsal view their posterior edge curves backwards on the sides, partially wrapping around the front of the pronotum. The dorsal width across the eyes is slightly broader than the thorax. The head & pronotum are both broader than long. Dorsum of body conspicuously punctate. Claval commisure of the wings (see figure here) very short or absent.
Throughout NA(2) and worldwide(1)
Geocorinae are predatory, the rest (2 small subfamilies, not in NA) are assumed to be phytophagous, probably granivorous(1)
Print References
Barber, H.G. (1935) New Geocoris from the United States, with key to species (Lygaeidae: Geocorinae). Journal New York Entomological Society, 43, 131–137. (Full Text)
McAtee, W.L. (1914) Key to the nearctic genera and species of Geocorinae (Heteroptera: Lygaeidae). Proceedings of the Biological Society of Washington, 27, 125–136. (Full Text)
Internet References
Curated Geocoridae images from the Spencer Entomological Collection of the University of British Columbia.
Works Cited
1.Zoological catalogue of Australia: Hemiptera: Heteroptera (Pentatomomorpha)
Cassis G., Gross G.F. 2002. CSIRO Publishing, 751 pp.
2.American Insects: A Handbook of the Insects of America North of Mexico
Ross H. Arnett. 2000. CRC Press.