Thyanta calceata (Say, 1831a) Distribution: United States: AL, AR, CT (Parshley 1917, 1923a; Van Duzee 1917; Rider & Chapin 1992; O’Donnell & Schaefer 2012), DC (Rider & Chapin 1992), FL, GA, IA (Rider & Chapin 1992), IL, IN (Blatchley 1926, Evans 1957, Rider & Chapin 1992), KS (Rider & Chapin 1992), KY (Rider & Chapin 1992), LA (Rider & Chapin 1992), MA (Parshley 1917, Rider & Chapin 1992), MD (Rider & Chapin 1992, Brown & Bahr 2008), MI (Rider & Chapin 1992, Swanson 2012), MO (Froeschner 1941, Rider & Chapin 1992, Sites et al. 2012), MS (Richmond 1962, Rider & Chapin 1992), NC, NE (Wheeler 2015b), NJ (Say 1831a, Van Duzee 1917, Rider & Chapin 1992), NY (Stål 1872, Olsen 1912, Torre-Bueno 1915, Van Duzee 1917, Rider & Chapin 1992, Roch 2020), OH (Furth 1974, Rider & Chapin 1992), OK (Arnold & Drew 1988, Rider & Chapin 1992), PA (Rider & Chapin 1992), SC, TN (Stål 1872, Rider & Chapin 1992, Lambdin et al. 2003), TX, VA, VT (Roch 2020), WV (Rider & Chapin 1992). Comments: This species, in early works, was confused with Thyanta custator custator, both of which have a black, piceous line along each anterolateral pronotal margin. Interestingly, the fact that this species was distinct from Thyanta custator custator was first discovered through the chromosomal work of Wilson (reported on in Barber 1911b), who then sent his specimens to Barber for further morphological work. Wilson determined that this species had twice the number of chromosomes as was present in Thyanta custator custator. Barber (1911b) was then able to document several morphological characters in which the two species were distinct.

Published as part of Rider, David A. & Swanson, Daniel R., 2021, A distributional synopsis of the Pentatomidae (Heteroptera) north of Mexico, including new state and provincial records, pp. 1-69 in Zootaxa 5015 (1) on page 38, DOI: 10.11646/zootaxa.5015.1.1, http://zenodo.org/record/5159085