Kaliwatan sa kaka ang Neospintharus rioensis^[1]. Una ning gihulagway ni Harriet Exline ug Levi ni adtong 1962.^[2] Ang Neospintharus rioensis sakop sa kahenera nga Neospintharus, ug kabanay nga Theridiidae.^[1][3]

Kini nga matang hayop na sabwag sa:

• Brasil
• Argentina

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: 54090152. Retrieved 2019-11-11. {{cite web}}: |author= has generic name (help)CS1 maint: multiple names: authors list (link)
2. ↑ Exline, H., Levi, H. W. (1962) American spiders of the genus Argyrodes (Araneae, Theridiidae) , Bulletin of the Museum of Comparative Zoology 127: 75-204
3. ↑ Kropf C., Nentwig W., Blick T. & Gloor D. (organizing board). (2019). WSC: World Spider Catalog (version 19.5, Jan 2019). 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.