The Worms. Phylum Platyhelminthes Phylum Nemertea Phylum Nematoda Phylum Annelida . Bilateral Symmetry. One way to cut and get 2 identical halves Front (anterior) and rear (posterior) Back (dorsal) and belly (ventral) More active in pursuit of prey. Platyhelminthes - Flatworms.
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The Christmas tree worm, Spirobranchus giganteus, is a Christmas tree-shaped serpulid tube-dwelling worm with magnificent twin spirals of plumes used for feeding and respiration. This cone-shaped worm is one of the most widely recognized sedentary polychaete worms.