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

Image copyrights: Scott Godwin

Trunk 10-28 mm long, thick-skinned with rather tapering posterior end. Introvert three-fourths to one and a quarter as long as the trunk, with about 20 tentacles at its tip and 30-45 complete rows of obtuse-angled hooks at its distal end, each hook with a clear transparent streak slightly expanded in middle and base but without triangular area. Longitudinal muscles grouped into 23-27 bands. Retractor muscles two pairs. Rectum short and without caecum. Spindle muscle attached posteriorly. Fixing muscle single and bifurcated. Nephridia half as long as trunk and partly attached.

Synonym (s)
Phascolosoma nigrescens Keferstein 1865
Phascolosoma nigrescens Cutler, Cutler and Nishikawa 1984

Common Name (s)
Economic Importance and Threats

Habitat:  Coastal


• Lakshadweep, Andrott INDIA (Record: 19/12/1979)
• Lakshadweep, Agatti INDIA (Record: 5/4/1984)
• Lakshadweep, Minicoy INDIA (Record: 18/02/1986)

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
  • Botany University of Hawai'i at Manoa Available at -

Page last updated on:2010-11-26

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