Rearing immatures of Euschistus tristigmus tristigmus in a range of split photophases during each 24 h period and in constant light showed that the adult dimorphic response in shoulder shape and number of midventral spots could be produced; individuals reared in photoperiods in which each scotopnase was at least 2 h in length developed into the tristigmus (short-day) form.
McPherson, J. E. and Paskewitz, S. M.
"Effects of Various Split Developmental Photophases and Constant Light During 24 Hour Period on Adult Morphology in Euschistus Tristigmus Tristigmus (Hemiptera: Pentatomidae),"
The Great Lakes Entomologist, vol 15
Available at: https://scholar.valpo.edu/tgle/vol15/iss3/3