Order PHASCOLOSOMATIFORMES
Introduction
After Edmonds (2000)
Phascolosomatiformes are distinguished by having an anterior trunk which is not modified to form an anal shield and four introvert retractor muscles. The order includes one family, Phascolosomatidae.
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.