Dyschirius (Dyschiriodes) dejeanii
Geographic: nea
Distribution: Native, New World. Canada – AB, BC, MB, NB, NF, NS, NT, ON, PE, PQ,
SK; USA – AK, CA, CO, CT, IA, ID, IN, KS, MA, ME, MI, MN, MT, ND, NE, NH, NJ, NM,
NV, NY, OH, OR, PA, RI, SD, UT, VT, WA, WI, WY.
Common name: Dejean’s Discolored Beetle
Synonyms: Clivina punctata Dejean, 1831:498, nomen nudum
Dyschirius dejeanii Putzeys, 1846:545
Dyschirius integer LeConte, 1852:196
Dyschirius apicalis LeConte, 1850:204
Dyschirius nigripes LeConte, 1853:366
Dyschirius transmarinus von Mannerheim, 1853:112
Dyschirius basalis LeConte, 1857:77
Dyschirius dejeani Putzeys, 1866:93
Macrohabitat: Lowlands to mountains, 29 – 2621 meters altitude, in floodplain
forests, on borders of eutrophic marshes, swamps, at the margins of temporary or permanent
ponds and sloughs (both freshwater and alkaline), lakes, pools, slow rivers, brooks, and
irrigation ditches, in the vicinity of cattle water holes, mud flats, wet pastures, cultivated fields
(e.g., carrot), beaver ponds, sand, and in mats of Potamogeton spp. Microhabitat: Adults are
ground-dwelling on exposed moist wet clay or sand-mixed with clay substrate, often rich in
organic matter, sometimes alkaline or saline, with bare spots surrounded by depressed sparse
or moderately dense vegetation. Dispersal abilities: Macropterous, capable of flight; slow
runners and strong burrowers; occasional climbers. Seasonal occurrence: Adults have been
found in January – November; teneral adults in late June – August. Behavior: Adults are
nocturnal, predaceous, and take cover during the day in burrows they dig into the substrate,
or cracks in the substrate, under mats of dead grass, under stones and at the base of plants.
Adults repeatedly found at lights at night and occasionally in drift and wash up; they are gregarious.
Adults overwinter in the substrate in burrows (as deep as 7.5 cm) on higher and drier
substrate, in the upper zone of marsh borders, on lake shores, and at the edge of woods in
moss or leaf litter.