CHRISTMAS TREE WORM (Spirobranchus sp) Location:Jeddah,Saudi Arabia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Jeddah,Saudi Arabia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Jeddah,Saudi Arabia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

Cynarina Location:Jeddah,Saudi Arabia is a genus of stony coral in the family Lobophylliidae. It is monotypic and the only species in the genus is Cynarina lacrymalis. It is variously known as the flat cup coral, the solitary cup coral, the button, doughnut or cat's eye coral

Colonial frost worm (Filogranella elatensis) Location:Jeddah,Saudi Arabia Crowns ro 1 cm. Colonial masses of fine calcareous tubes. Biology: in rubble or sand along reef edges.

Arabian ascidian (Rhopalaea sp.) Location:Jeddah,Saudi Arabia To 5 cm. Solitary; transparent with white sperm duct. Biology: hard bottoms of reef flats and slopes.

Sabellidae (feather duster worms) are sedentary marine polychaete tube worms where the head is mostly concealed by feathery branchiae. They build tubes out of parchment, sand, and bits of shell. Location:Jeddah,Saudi Arabia

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Jeddah,Saudi Arabia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Jeddah,Saudi Arabia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

Large worm shell (Dendropoma maxima) Location:Jeddah,Saudi Arabia To 20 cm, operculum to 15 mm across. Embedded in corals. Biology: in large coral heads of reef flats and upper slopes. Lives in a calcareous tube which it secretes. Produces a fine mucus veil which filters plankron and is hauled in about every 15 minutes by day and night. Jueveniles grow within tube!

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Jeddah,Saudi Arabia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

Ascidiacea (commonly known as the ascidians or sea squirts) is a class in the subphylum Tunicata of sac-like marine invertebrate filter feeders. Ascidians are characterized by a tough outer "tunic" made of the polysaccharide tunicin, as compared to other tunicates which are less rigid. Location:Raja Ampat,Indonesia

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Raja Ampat,Indonesia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Raja Ampat,Indonesia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Raja Ampat,Indonesia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Raja Ampat,Indonesia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Jeddah,Saudi Arabia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

Siphonogorgia cf. godeffroyi Location:Raja Ampat,Indonesia To 60 cm. Forms fans; rusty red with white polyps. Biology: usually on current-swept fore-reef slopes below 15 m. Sometimes near entrance of caves

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Raja Ampat,Indonesia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Raja Ampat,Indonesia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

Arabian ascidian (Rhopalaea sp.) Location:Jeddah,Saudi Arabia To 5 cm. Solitary; transparent with white sperm duct. Biology: hard bottoms of reef flats and slopes.

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Raja Ampat,Indonesia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

CHRISTMAS TREE WORM (Spirobranchus sp) Location:Raja Ampat,Indonesia This species has twin spiral tentacles with extremely variable colors. They are round and look like Christmas trees. They have a yellowish operculum. They live in hard corals such as coral heads and penetrate with a calcareous tube.

Feather sea pen (Pteroeides sp.) Location:Lembeh,Indonesia To 10 cm. Specialized octocorals with a single stalk anchored into sediment by a muscular peduncle. Three families, this one broad and feather-like. Biology: sandy expanses and slopes. Feeds on zooplankron,

Ascidiacea (commonly known as the ascidians or sea squirts) is a class in the subphylum Tunicata of sac-like marine invertebrate filter feeders. Ascidians are characterized by a tough outer "tunic" made of the polysaccharide tunicin, as compared to other tunicates which are less rigid. Location:Raja Ampat,Indonesia

Red cup coral (Tubastrea coccinea) Location:Jeddah,Saudi Arabia To 30 cm. Orange with yellow tentacles. Biology: in caves and under overhangs, to 25 m. Lacks zooxanrhellae, feeds on zooplankton.