Kaliwatan sa muragwati ang Placostegus tridentatus^[1]. Una ning gihulagway ni Fabricius ni adtong 1779.^[2] Ang Placostegus tridentatus sakop sa kahenera nga Placostegus, ug kabanay nga Serpulidae.^[1][3]

Kini nga matang hayop na sabwag sa:

• sidlakang Dagat Mediteraneo
• amihanang Kadagatang Atlantiko
• Exclusive Economic Zone sa Espanya
• Scotland (apil sa nasod)
• Dagat Mediteraneo

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: 54376567. Retrieved 2019-11-11. {{cite web}}: |author= has generic name (help)CS1 maint: multiple names: authors list (link)
2. ↑ PESI (A Pan-European Species directories Infrastructure) focal points ,
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.