Aquatic Ape Theory

Phylum Hemichordata Phylum Hemichordata- Brief description of the phylum with images of some fossil species. The Phylum Hemichordata The Phylum Hemichordata- An introduction to the hemichordates including their characteristics and the two classes Enteropneusta and Pterobranchia. Hemichordata Hemichordata- Information from Wikipedia on this phylum of worm-shaped marine deuterostome organisms. Hemichordata (Acorn Worms and Pterobranchs) Hemichordata (Acorn Worms and Pterobranchs)- Photograph of an acorn worm (Saccoglossus kowalevskii). Introduction to the Hemichordata Introduction to the Hemichordata- UCMP Berkeley's introduction to the acorn worms. Includes information on graptolites.