Series 1-3 References:

  1. Perry, O., Sapir, Y., Perry, G., Ten Hove, H., & Fine, M. (2018). Substrate selection of Christmas tree worms (Spirobranchus spp.) in the Gulf of Eilat, Red Sea. Journal of the Marine Biological Association of the United Kingdom, 98(4), 791–799. https://doi.org/10.1017/S0025315416002022

  2. Read, G. B. et al. (2016). 37 Spirobranchus species currently recognized… [summary].

  3. Pillai, T. (2009). Spirobranchus triqueter in the Arctic.

  4. Rzhavsky, A. et al. (2014). Distribution of Spirobranchus species.

  5. Nygaard, K. (2008). S. giganteus on octocorals, rubble, and man-made structures.

  6. Skinner, L. F., Tenório, A. A., Penha, F. L., & Soares, D. C. (2012). First record of Spirobranchus giganteus (Pallas, 1766) on southeastern Brazilian coast: new biofouler and free to live without corals? Pan-American Journal of Aquatic Sciences, 7(3), 117–124. https://www.vliz.be/imisdocs/publications/288863.pdf

  7. Hoeksema, B. W., & Ten Hove, H. A. (2014). Antler-shaped spines on opercula of Spirobranchus spp.

  8. Hoeksema, B. W., et al. (2017). Tube morphology and spikes on Christmas tree worms.

  9. van der Schoot, R., Scott, C. M., Ten Hove, H. A., & Hoeksema, B. W. (2016). Christmas tree worms as epibionts of giant clams at Koh Tao, Gulf of Thailand. Marine Biodiversity, 46(4), 751–752. https://doi.org/10.1007/s12526-015-0439-0

  10. Hoeksema, B. W., Wels, D., van der Schoot, R. J., & Ten Hove, H. A. (2019). Coral injuries caused by Spirobranchus opercula with and without epibiotic turf algae at Curaçao. Marine Biology, 166(5), Article 60. https://doi.org/10.1007/s00227-019-3504-6

  11. Bennett-Smith, M. F., Froehlich, C. Y. M., Vizer, L. F., & Buston, P. M. (2025). Evidence of novel symbiotic relationships between Christmas tree worms and coral reef blennies and gobies. Symbiosis, 96(2), 163–176. https://doi.org/10.1007/s13199-025-01067-w

  12. Petrocelly, C. (2022). The Christmas Tree Worm (Spirobranchus giganteus) as a potential bioindicator of coral reef health. Berkeley Scientific Journal, 27(1). https://escholarship.org/content/qt305555sk/qt305555sk.pdf

  13. DeVantier, L. M., Reichelt, R. E., & Bradbury, R. H. (1986). Does Spirobranchus giganteus protect host Porites from predation by Acanthaster planci. Marine Ecology Progress Series, 32, 307–310.

  14. Marsden, J. R. (1987). Coral preference behaviour by planktotrophic larvae of Spirobranchus giganteus corniculatus.Coral Reefs, 6, 71–74.

  15. Nishi, E., & Nishihira, M. (1996). Age-estimation of the Christmas tree worm Spirobranchus giganteus living buried in the coral skeleton. Fisheries Science, 62, 400–403.

  16. Hoeksema, B. W., Lau, Y. W., & Ten Hove, H. A. (2015). Octocorals as secondary hosts for Christmas tree worms off Curaçao. Bulletin of Marine Science, 91, 489–490.

  17. Glynn, P. W., & Manzello, D. P. (2015). Polychaete bioerosion and coral health.

  18. Willette, D. A., Iñiguez, A. R., Kupriyanova, E. K., Starger, C. J., Varman, T., Toha, A. H., Maralit, B. A., & Barber, P. H. (2015). Christmas tree worms of Indo-Pacific coral reefs: untangling the Spirobranchus corniculatus complex. Coral Reefs, 34(3), 899–904. https://doi.org/10.1007/s00338-015-1294-y

  19. Hoeksema, B. W., García-Hernández, J. E., van Moorsel, G. W. N. M., Olthof, G., & Ten Hove, H. A. (2020). Extension of the recorded host range of Caribbean Christmas tree worms (Spirobranchus spp.). Diversity, 12(3), 115. https://doi.org/10.3390/d12030115

  20. Isdianto, A., Amanda, S. S., Yamindago, A., Dewi, C. S. U., Aliviyanti, D., Luthfi, O. M., Fathah, A. L., Atikawati, D., Putri, B. M., & Puspitasari, I. D. (2024). Water quality impact Christmas tree worms (Spirobranchus spp.) distribution and community structure on hard corals at Sempu Island Nature Reserve, Malang, Indonesia. Journal of Ecological Engineering, 25(5), 175–186. https://doi.org/10.12911/22998993/186161

  21. Hutchings, P. (2011). Bioeroders and coral structural integrity.

  22. Samimi Namin, K., et al. (2010). High-density effects of Spirobranchus on corals.

  23. Borger, T. (2005). Spirobranchus stress on surrounding polyps.

  24. Schuhmacher, H. (1977). Empty worm tubes as habitat for cryptofauna.

  25. Clarke, J., & Tyler, P. (2003). Turf algae colonization of dead worm tubes.

  26. Hoeksema, B. W., et al. (2018, 2019). Spirobranchus and host coral stress.

  27. Sapir, Y., et al. (2018). Distribution of Spirobranchus spp. among corals.

  28. Barus, B., et al. (2018). Effect of temperature on coral productivity.

  29. Moira, A., et al. (2020). Effect of salinity on coral and worm survival.

  30. Çinar, M. E., & Dagli, E. (2021). Polychaete bioeroders on calcareous structures.

  31. Nygren, A. (2014). Cryptic lineages in polychaetes.

  32. Ten Hove, H. A. (1970). Serpulinae (Polychaeta) from the Caribbean: I – The genus Spirobranchus.

  33. Bastida-Zavala, J. R. (2008). Serpulidae and Sabellidae in fouling communities.

  34. Tovar-Hernandez, M., et al. (2009). Importance of polychaetes in benthic communities.

  35. Fiege, D., & Ten Hove, H. A. (1999). Redescription of type B as Spirobranchus gaymardi.

  36. Smith, C. (1985). Intermediate forms of Spirobranchus opercula.

  37. Martin, D., & Britayev, T. A. (2018). Symbiotic polychaetes revisited: an update of the known species and relationships (1998–2017). Oceanography and Marine Biology: An Annual Review, 56, 371–448.

Photo References

National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS) https://oceanservice.noaa.gov


Nick Hobgood – “Spirobranchus giganteus (Red and white Christmas tree worm)”. Wikimedia Commons: CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0/


Philippe Bourjon - “Porites lutea – Réunion”. Wikimedia Commons: CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0/


James St. John - “Thalassoma bifasciatum (bluehead wrasse), San Salvador Island, Bahamas”. Wikimedia Commons: CC BY 2.0 https://creativecommons.org/licenses/by/2.0/


James St. John - “Spirobranchus giganteus (Christmas tree worm) – San Salvador Island, Bahamas. Wikimedia Commons: CC BY 2.0 https://creativecommons.org/licenses/by/2.0/


Pauline Walsh Jacobson - “Caribbean Christmas Tree Worm (Spirobranchus giganteus) – United States Virgin Islands”. Wikimedia Commons: CC BY 4.0 https://creativecommons.org/licenses/by/4.0/


Montipora informis – Jim Maragos, National Park Service (Public Domain)

Matthew T. Rader - “Sergeant Major Fish (Abudefduf saxatilis), Curaçao”. Wikimedia Commons: CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0/


Nick Hobgood - “Christmas tree worms (Spirobranchus giganteus), East Timor”. Wikimedia Commons: CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0/


Albert Kok - “Feather duster worm (Spirographe)”. Public domain


Rickard Zerpe - “2017, Cuba, Jardines Aggressor, Cachiboca I, Christmas Tree Worms”. Wikimedia Commons: CC BY 2.0 https://creativecommons.org/licenses/by/2.0/


Kevin King - “Spirobranchus giganteus – White Christmas Tree Worm”. Wikimedia Commons: CC BY 2.0 https://creativecommons.org/licenses/by/2.0/


James St. John - “Porites astreoides (mustard hill coral), San Salvador Island, Bahamas”. Wikimedia Commons: CC BY 2.0 https://creativecommons.org/licenses/by/2.0/


Christian Gloor - “Coral polyps (UV shot)”. Wikimedia Commons: CC BY 2.0 https://creativecommons.org/licenses/by/2.0/


Hillewaert, H. (n.d.). Alitta succinea (epitoke) [Photograph]. Wikimedia Commons. Licensed under CC BY-SA 4.0. https://commons.wikimedia.org/wiki/File:Alitta_succinea_(epitoke).jpg


Burek, F., & Burek, J. (2014). Pseudodiploria strigosa, surrounded by Colpophyllia natans. NOAA. Public Domain.

Diego Delso - “Christmas tree worm (Spirobranchus giganteus), Anilao, Philippines”. Wikimedia Commons: CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0/