Dyschirius (Paradyschirius) affinis
Geographic: NEA
Distribution: Native, New World. Canada – ON, PQ; México – NL, TM; USA – AL, AZ,
CO, CT, DC, IA, IL, KS, MA, MD, ME, MT, ND, NE, NH, NM, NY, OH, OK, PA, TN, TX,
VA, VT, WI, WY.
Common name: Related Discolored Beetle
Synonyms: Dyschirius affinis Fall, 1901:209
Dyschirius duplicatus Fall, 1901:209
Macrohabitat: Lowlands, sea level – 1112 meters altitude, on river banks, margins
of ponds located in sand and gravel pits, lakeshores, and reservoir margins. Microhabitat:
Adults are ground-dwelling on exposed steep, moist or wet, clayish sandy bare substrate,
sometimes mixed with silt and pebbles; they are strictly riparian. Dispersal abilities: Macropterous,
capable of flight; slow runners; strong burrowers. Seasonal occurrence: Adults have
been found in April – October; teneral adults in July – September; probably a spring breeder.
Behavior: Adults are nocturnal, predaceous, and take cover during the day in burrows they
dig in the substrate; they are gregarious and are attracted to lights. They occur in company
of at least two species of Bledius ssp. In the northern part of their range, adults overwinter in
the substrate; in the southern part, they likely aestivate during the dry season in the substrate.