Phascolosoma agassizii   Keferstein  1866 (Marine Worm)
Organism information awaits expert curation
Class: Phascolosomatidea

Trunk 30 mm long, opaque-skinned and with bluntly rounded posterior end. Introvert retracted and about half the length of trunk. Hooks arranged in 10 rows, with indistinct triangular area and without accessory tooth, apex of hook bending at an obtuse angle. Longitudinal muscle layer separated into 19-21 anastomosing bands. Retractor muscles two pairs. Rectum with caecum. Spindle muscle attached posteriorly. Nephridia about half as long as the trunk and attached by their anterior half.

Synonym (s)
Phascolosoma agassizii Keferstein 1866
Physcosoma agassizii Shipley 1903
Phascolosoma (Phascolosoma) agassizii Cutler and Cutler 1979

Common Name (s)
Economic Importance and Threats

Habitat:  Coastal


• Lakshadweep, Kavaratti INDIA (Record: 4/2/1986)

Literature Source(s)
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Haldar, BP (1991) Sipuncula State fauna series 2: Fauna of Lakshadweep ZSI, Calcutta 167-183 Available at - NIO, Goa
  • Cowles, D (2002) Key to invertebrates found at or near the Rosario Beach Marine Laboratory (a campus of Walla Walla University) Fidalgo Island, Anacortes, WA Available at -

Page last updated on:06-04-09

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