Kaliwatan sa muragwati ang Sphaerosyllis hystrix^[1]. Una ning gihulagway ni Jean Louis René Antoine Édouard Claparède ni adtong 1863.^[2] Ang Sphaerosyllis hystrix sakop sa kahenera nga Sphaerosyllis, ug kabanay nga Syllidae.^[1][3]

Kini nga matang hayop na sabwag sa:

• sidlakang Dagat Mediteraneo
• Kanal La Mancha
• Dagat Amihanan
• Baie de Fundy (luuk sa Kanada, Nova Scotia)
• amihanang Kadagatang Atlantiko
• Dagat Adriyatiko
• Aegean Sea
• Exclusive Economic Zone sa Espanya
• Exclusive Economic Zone sa Suwesya
• Israel
• Wimereux
• Dagat Mediteraneo
• Plymouth
• East Coast of Spain
• Roscoff
• North West Italy

Usa ka matang nga nahiubos niini atong makita S. h. anoculata.^[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: 54376275. Retrieved 2019-11-11. {{cite web}}: |author= has generic name (help)CS1 maint: multiple names: authors list (link)
2. ↑ Bellan, G. (2001) Polychaeta, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification , Collection Patrimoines Naturels. 50: 214-231
3. ↑ Read G. & Fauchald K. (eds). (2019). WoRMS Polychaeta: World Polychaeta database (version 2019-03-05). 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.