Order SIPUNCULIFORMES
Introduction
After Edmonds (2000)
Sipunculiformes are distinguished by having the longitudinal musculature of the body wall grouped into bands and coelomic extensions (canals or sacs) in the body wall (except in Phascolopsis). The order comprises a single family, Sipunculidae.
General References
Edmonds, S.J. 2000. Phylum Sipuncula. pp. 375-400 in Beesley, P.L., Ross, G.J.B. & Glasby, C.J. (eds). Polychaetes & Allies: The Southern Synthesis. Fauna of Australia Vol. 4A Polychaeta, Myzostomida, Pogonophora, Echiura, Sipuncula. Melbourne : CSIRO Publishing Vol. 4 Part A xii 1-465 pp.