Kaliwatan sa insekto ang Philopterus underwoodi.^[1] Una ning gihulagway ni Carriker Jr. ni adtong 1903.^[2] Ang Philopterus underwoodi sakop sa kahenera nga Philopterus, ug kabanay nga Philopteridae.^[1][3] 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: 54693611. Retrieved 2019-11-11. {{cite web}}: |author= has generic name (help)CS1 maint: multiple names: authors list (link)
2. ↑ Carriker Jr. (1903) Mallophaga from birds of Costa Rica, Central America. , Nebraska Univ. Studies 3:123-192
3. ↑ Johnson K.P., Smith V.S., Hopkins H. & Eades D.C. (2019). SF Psocodea: Psocodea Species File (version 5.0, Jun 2018). 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.