Kaliwatan sa insekto ang Pepsis gracillima.^[1] Una ning gihulagway ni Taschenberg ni adtong 1869.^[2] Ang Pepsis gracillima sakop sa kahenera nga Pepsis, ug kabanay nga Pompilidae.^[1][3]

Kini nga matang hayop na sabwag sa:

• Venezuela
• Ecuador
• Colombia

Walay nalista nga matang nga sama niini.^[1]

1. ↑ ^{1.0 1.1 1.2} Roskov Y., Kunze T., Orrell T., Abucay L., Paglinawan L., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Decock W., De Wever A., Didžiulis V. (ed) (2019). "Species 2000 & ITIS Catalogue of Life: 2019 Annual Checklist". Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-884X. TaxonID: 37510320. Retrieved 2019-11-11. {{cite web}}: |author= has generic name (help)CS1 maint: multiple names: authors list (link)
2. ↑ Taschenberg, E. (1869) Die Pompiliden des Museums der Universität Halle. , Zeitschrift fu¨r die Gesammten Naturwissenschaften 34: 25-75
3. ↑ Kroupa A.S., Lohrmann V., Pulawski W.J. & Schmid-Egger C. (2019). HymIS: Hymenoptera Information System (version Jul 2017). In: Species 2000 & ITIS Catalogue of Life, 2019 Annual Checklist (Roskov Y., Ower G., Orrell T., Nicolson D., Bailly N., Kirk P.M., Bourgoin T., DeWalt R.E., Decock W., Nieukerken E. van, Zarucchi J., Penev L., eds.). Digital resource at www.catalogueoflife.org/annual-checklist/2019. Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-884X.