Tiny worm-like animals (less than 1 mm) that live
between grains of sand, they have 11 cuticular rings and a spiny,
introvertible head or snout that is used for locomotion and grazing
single-celled organisms.
Echinoderes horni
YO-257 wreck, Waikiki, Oahu, 100 feet
Found in sediments subtidally in Hawaii. About 0.3 mm.
