Introduction to Phoronida

The Phoronida is one of the smallest and least familiar phyla; there are about twelve or so living species in two genera, Phoronis and Phoronopsis. However, phoronids -- or "horseshoe worms," as they are sometimes called - may be abundant in shallow marine sediments at certain localities.

Publisher - University of California Museum of Paleontology

Subjects - Phoronida, Horseshoe Worms

http://www.ucmp.berkeley.edu/brachiopoda/phoronida.html

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Citation: Collins AG. 1995. Introduction to Phoronida. Berkeley, CA: University of California Museum of Paleontology. http://www.ucmp.berkeley.edu/sipuncula/sipuncula.html