Priapulida
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Bacaan lanjut
http://www.discoverlife.org/20/q?search=Priapulida
van der Land, J. 1970. Systematics, zoogeography, and ecology of the Priapulida. Zoologische Verhandelingen Rijksmuseum van Natuurlijke Historie te Leiden 112:1–118.

van der Land, J. and A. Nørrevang. 1985. Affinities and intraphyletic relationships of the Priapulida. Pages 261-273 in The Origins and Relationships of Lower Invertebrates. S. Conway Morris, J. D. George, R. Gibson, and H. M. Platt (eds.). The Systematics Association and Clarendon Press, Oxford, England.

Sumber gambar
http://www.earthlife.net/inverts/priapula.html

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