Feather Duster Worm (Sabellastarte spectabilis) ケヤリムシ
Feather Duster Worms are a type of Polychaete worm living in a tube. Polychaete worms are Bristle Worms. Feather Dusters have a fan for collecting food. The fan can be retracted for feeding and if it senses danger. It is hard to find a good guide for distinguishing the species. Most likely you would have to examine the worm in the tube for some. Here are a few examples of the Feather Dusters. Enoshima
Feather Duster Worm (Bispira tricyclia)? カタマキケヤリ Amami
Feather Duster Worm (Sabella fusca)? ホンケヤリムシ
Feather Duster Worms are a type of Polychaete worm living in a tube. Polychaete worms are Bristle Worms. Feather Dusters have a fan for collecting food. The fan can be retracted for feeding and if it senses danger. It is hard to find a good guide for distinguishing the species. Most likely you would have to examine the worm in the tube for some. Here are a few examples of the Feather Dusters. Izumo
Feather Duster Worm (Sabellastarte spectabilis)? インドケヤリ Amami