Web Directory

» Hemichordata
   Information from Wikipedia on this phylum of worm-shaped marine deuterostome organisms.
   http://en.wikipedia.org/wiki/Hemichordate

» Hemichordata (Acorn Worms and Pterobranchs)
   Photograph of an acorn worm (Saccoglossus kowalevskii).
   http://tolweb.org/tree?group=Hemichordata&contgroup=Metazoa

» Introduction to the Hemichordata
   UCMP Berkeley's introduction to the acorn worms. Includes information on graptolites.
   http://www.ucmp.berkeley.edu/chordata/hemichordata.html

» The Phylum Hemichordata
   An introduction to the hemichordates including their characteristics and the two classes Enteropneusta and Pterobranchia.
   http://www.earthlife.net/inverts/hemichordata.html