The hemichordates form a small phylum of a few hundred species. They are worm-like creatures with their bodies divided into 3 parts, a pre-oral lobe, a collar and a trunk. Their name means “half chordate” and they have certain primitive features that resemble those of true chordates. The three main groups are the Enteropneusta, or acorn worms, the Pterobranchia and the Graptolithina.
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- Introduction to the Hemichordata UCMP Berkeley's introduction to the acorn worms. Includes information on graptolites.
- Hemichordata (Acorn Worms and Pterobranchs) Photograph of an acorn worm (Saccoglossus kowalevskii).
- Hemichordata Information from Wikipedia on this phylum of worm-shaped marine deuterostome organisms.
- The Phylum Hemichordata An introduction to the hemichordates including their characteristics and the two classes Enteropneusta and Pterobranchia.
- Phylum Hemichordata Brief description of the phylum with images of some fossil species.