Surf these sites: Chordata introduction - Phylum Hemichordata -- A brief introduction to the hemichordates from the Biological Sciences at the University of Paisley. Hemichordata -- The Tree of Life hemichordate page, mainly notable for its beautiful photograph of an acorn worm. Introduction to the Hemichordata -- UCMP Berkeley''s introduction to the acorn worms. The site includes information on graptolites. Protochordates -- Hemichordata and some chordate groups are described and illustrated with drawings and photographs from this lab manual published by the University of Sydney, Australia.
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