Echiura (spoon worms)
Jensen, K. (2005). Echiura (spoon worms), in: Rohde, K. (Ed.) Marine parasitology. pp. 246-248
In: Rohde, K. (Ed.) (2005). Marine parasitology. CSIRO Publishing (Commonwealth Scientific and Industrial Research Organization): Collingwood. ISBN 0-643-09025-8. 565 pp., more
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