Platynus parmarginatus is a species of ground beetles in the family Carabidae. It is found in North America.
References
Bousquet, Yves (2012). "Catalogue of Geadephaga (Coleoptera, Adephaga) of America, north of Mexico". ZooKeys, issue 245, 1–1722.
Further reading
Arnett, R.H. Jr., and M. C. Thomas. (eds.). (2000). American Beetles, Volume I: Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia. CRC Press LLC, Boca Raton, FL. Arnett, Ross H. (2000). American Insects: A Handbook of the Insects of America North of Mexico. CRC Press. Richard E. White. (1983). Peterson Field Guides: Beetles. Houghton Mifflin Company.