Zoomorphology. Double-horned operculum extends from between radioles. Spirobranchus essentially translates to "spiral gills", referring to the worm's unique crown. These cone-shaped worms are one of the most widely recognized sedentary polychaete worms. The variously colored worm crowns make extremely popular underwater photographic subjects for sport divers. Worms onDiploria strigosa were larger in all size parameters than those onMontastrea annularis, which were larger than those onMontastrea … Conlin, B.E. This site uses Akismet to reduce spam. Taxonomy [Spirobranchus giganteus] [Phylum: Annelida] [Class: Polychaeta] [Family: Serpulidae] The Christmas Tree Worm is its common nickname but in fact this member of the tube-dwelling marine sea worm family is found mostly on coral reefs and is scientifically called Spirobranchus giganteus. They are very sensitive to light, shadows and motion (Sajem, 2016). ... Habitat: Size (cm) Diet: Behaviour: Sex : Co: 4 (crown) Pla: I: F: These are highly modified prostomial palps, which are specialized mouth appendages. The serpulid polychaete Spirobranchus giganteus (Pallas) is an obligate associate of live coral. As the species is widespread and relatively common, no conservation efforts focus on this species (or polychaetes in general). On Barbados reefs it is known to occur more commonly on some coral species than on others. Spirobranchus giganteus has an indirect lifecycle, like all the lophotrochozoans, a group that includes many Phylums of animals, molluscs included. GBIF network ~ OBIS distribution map ~ AquaMaps. Like other polychaetes, S. giganteus excretes with fully developed nephridia. They come in many colors including orange, yellow, blue, and white and, though they are small with an average 3.8cm in span, they are easily spotted due to their shape, … Christmas tree worms are widely distributed throughout the world's tropical oceans. 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