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Phylum Hemichordata Acorn Worms 1 Phylum Hemichordata Phylum Hemichordata 2 Defining characteristics – A conspicuous dorsal extension of the pharynx forms an anterior buccal tube or stomochord Phylum Hemichordata Acorn Worm Habits 3 Rarely found on the surface this group is found in the mud flats of our sounds and creeks – Burrow through sediment and ingest it, assimilating what is of value Some species remain in mucus lined burrows Phylum Hemichordata Tube Dweller 4 Phylum Hemichordata Body Structure 6 Phylum Hemichordata Feeding 7 Phylum Hemichordata Internal Transport 8 Possess a true circulatory system – The blood lacks pigment and runs in dorsal and ventral blood vessels Phylum Hemichordata Reproduction Fertilization occurs in the water and forms a feeding planktonic larva – 9 Tornaria Phylum Hemichordata