title: Review of Oxystigma Selys with the synonymy of Oxystigma williamsoni Geijskes (Odonata: Heteragrionidae).
abstract: Oxystigma williamsoni Geijskes, 1976 is synonymized with Oxystigma petiolatum (Selys, 1862), based on a reexamination of an extensive series of both taxa identified by D. Geijskes in the RMNH. Illustrations of the variability for both taxa and illustrations, maps, and keys for all species are provided.
authors.affiliation: Plant Pest Diagnostic Branch, California Department of Food and Agriculture, Sacramento, United States of America.; Email: rgarrison@cdfa.ca.gov.
authors.forename: Rosser W
authors.initials: RW
authors.lastname: Garrison
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D049628:Body Size; D005260:Female; D008297:Male; D063191:Odonata / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development