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Brusca, R.C. and G.J. Brusca, 1990. Invertebrates. Sinauer Associates Inc., Sunderland, U.S.A. 922 pp.

Burdon-Jones, C., 1957. Hemichordata. Enteropneusta, Family Ptychoderidae. Tornaria larvae. Fiches d'Identification du Zooplancton, 70 (1957). Conseil International pour l'Exploration de la Mer, Kopenhagen.

Hayward, P.J. and J.S. Ryland, 1995. Handbook of the Marine Fauna of North-West Europe. Oxford University Press, Oxford. 800pp.

Todd, C.D. and M.S. Laverack, 1991. Coastal marine zooplankton: A practical manual for students. Cambridge University Press, Cambridge. 106 pp.

Class Enteropneusta