Priapulida
Calloway, C.B. (1988). Priapulida, in: Higgins, R.P. et al. Introduction to the study of meiofauna. pp. 322-327
In: Higgins, R.P.; Thiel, H. (1988). Introduction to the study of meiofauna. Smithsonian Institution Press: Washington D.C.ISBN 0-87474-488-1. 488 pp., more
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