Spirobranchus corniculatus

Spirobranchus corniculatus
	Surat Thani, Thailand, 2023
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Annelida
Clade:	Pleistoannelida
Clade:	Sedentaria
Order:	Sabellida
Family:	Serpulidae
Genus:	Spirobranchus
Species:	S. corniculatus
Binomial name
	Spirobranchus corniculatus; (Grube, 1862)

Spirobranchus corniculatus, commonly referred to as the Indo-Pacific Christmas tree worm, is a species of tube-building annelid fanworms in the family Serpulidae.^[1]^[2] Belonging to the class Polychaeta, it is recognized for its bristle-like tentacles and the presence of a structure called radioles. It is widely encountered and recognized for its unique resemblance to a conifer and its diverse array of colors.^[3] Initially presumed to be part of a species group including Spirobranchus cruciger and Spirobranchus gaymardi, it has been determined to be a singular, morphologically adaptable species inhabiting the Central Indo-Pacific region.^[4]

Description

The Christmas tree worm is very vibrant in color and changes its color based on depth, camouflage, and a scare tactic.^[5] It has bright spiral rings around its body segments or radioles, which can number more than 200 segments.^[6] The body is abnormally large, ranging up to 45 mm (1.8 in) long and 0.5 mm (0.020 in) wide.^[6]

Biology

The species predominantly engages in reproduction throughout its lifespan. Males use their coloration to attract females.^[5] During mating, females emit a pheromone that signals males to release sperm. In turn, females release eggs; this action is called spawning.^[7] Larvae are characterized by an elongated body.^[8] The species also uses its color to make predators second guess their meal. The species primarily consumes suspended food particles, phytoplankton, and microalgae.^[5]

Distribution and habitat

Spirobranchus corniculatus can be found in the tropical Indo-Pacific, specifically in corals such as Porites lobata, which are typically found in Hawaiian waters.^[6] The Christmas tree worm inhabits depths of 3–30 m (9.8–98.4 ft)^[8] and can also be found living on almost every species of coral.^[5] It is mostly encountered in the eastern side of the globe, spanning Southeast Asia, the Indian Ocean, the central Pacific, and the northern region of Australia.^[5]

Gallery

References

^ WoRMS. "Spirobranchus corniculatus (Grube, 1862)". World Register of Marine Species. Retrieved 2024-02-05.
^ "Indo-Pacific Christmas Tree Worm (Spirobranchus corniculatus)". iNaturalist. Retrieved 2024-03-05.
^ "Spirobranchus corniculatus, Marshall Islands". www.underwaterkwaj.com. Retrieved 2024-03-05.
^ Kupriyanova, Elena (2015-04-17). "Exploring the diversity of Christmas tree worms in Indo-Pacific coral reefs". The Australian Museum. Retrieved 2024-03-05.
^ ^a ^b ^c ^d ^e Perry, Orly; Sapir, Yuval; Perry, Gad; Hove, Harry Ten; Fine, Maoz (June 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. Bibcode:2018JMBUK..98..791P. doi:10.1017/S0025315416002022. ISSN 0025-3154.
^ ^a ^b ^c Reef and shore fauna of Hawaii. 2/3. Bishop Museum special publication. Honolulu, Hawai'i: Bishop Museum Press. 1987. ISBN 978-0-930897-11-6.
^ Idris, Izwandy; Mohd-Salleh, Nadia Azeera; Ahmad Fadzil, Nur Dalia Natasya (2022), "Host Preferences and Colouration of Christmas Tree Worms, Spirobranchus corniculatus (Grube, 1862) from Bidong Island, South China Sea", Bidong Island, Cham: Springer International Publishing, pp. 177–187, doi:10.1007/978-3-030-91924-5_15, ISBN 978-3-030-91923-8, retrieved 2024-03-04
^ ^a ^b "Spirobranchus corniculatus". www.sealifebase.ca. Retrieved 2024-03-04.