Kaliwatan sa insekto ang Philopterus quadraticeps.^[1] Una ning gihulagway ni Kellogg ni adtong 1896.^[2] Ang Philopterus quadraticeps 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: 54693573. Retrieved 2019-11-11. {{cite web}}: |author= has generic name (help)CS1 maint: multiple names: authors list (link)
2. ↑ Kellogg (1896) New Mallophaga, I, with special reference to a collection made from maritime birds of the Bay of Monterey, California. , Proceedings of the California Academy of Sciences 2 6:31-168
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.