- Holotype: LSUMZ 75985 (originally USL 23933), adult ♀, collected by Tom Hardaway on 15 August 1975.
- Type locality: “Mexico, Puebla-Veracruz state line at Mexico Highway 125 [number in error, it is Highway 150 that extends north from Tehuacan, Puebla, to the state line at Puerto del Aire]”.
- Etymology: Named after Roger Conant.
- Rossman, D.A. & Burbrink, F.T. 2005. Species limits within the Mexican garter snakes of the Thamnophis godmani complex. Occasional Papers of the Museum of Natural Science 79: 1–43. Full article (PDF). Reference page.