Hemichordate acorn worms (Phylum Hemichordata) burrow deeply in fine, loose, sandy sediments. The casting here is a result of their feeding activities in which they swallow sediments (deposit feeding) then cast out the undigested parts in large coiled piles at the surface. They are not true worms, but are related to starfishes and chordates. Similar castings are widespread around the world on sand and mud flats. Dive site Tanjung Bacatan or Playgound, Lembata, Nera, Indonesia. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Carleton Ray, G. |
Taille de l’image : | 4608 px × 3456 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |