Phylum Echiura
Pilger, J.F. (2002). Phylum Echiura, in: Young, C.M. et al. (Ed.) Atlas of marine invertebrate larvae. pp. 371-373
In: Young, C.M.; Sewell, M.A.; Rice, M.E. (Ed.) (2002). Atlas of marine invertebrate larvae. Academic Press: San Diego. ISBN 0-12-773141-5. XIV, 626 pp., more
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