Mouth on ventral side of the collar. Tentacles on the head like a lophophore. Many pairs of gonads in the trunk coelom. Eggs cleave radially. B Taxonomy of the Phylum.
Proboscis cilia collect food.
Saccoglossus, Spengella, Balanoglossus. Rhabdopleura, Cephalodiscus, Atubaria. Assumed to be the larval stage of an unknown hemichordate.