Double fanworm

Bispira volutacornis is one of the beautiful fanworms of Aegean Sea. Fanworms are worms that prefer living in membranous tubes that creates over steady items even buried in mud or between rocks. The only part of these animals which is visibly is the tube and the double feather-crown that filters water for feeding and breathing. I usually find it on clear shallow waters like solitarily beaches. Its eyes alert the animal if the danger approaches it and rapidly hides its double crown inside the tube. When it is hidden the entrance of the tube closes and makes a peculiar 8. Its crown colour variation is from white (and pinkie white) to brown or reddish brown and depends on the sex and the sexually mature of the animal. B.volutacornis usually prefers solitarily living but sometimes you can meet a couple of them (photo) or more.