Amphicteis posterobranchiata   Fauvel,  1932 (Marine Worm)
Organism information awaits expert curation
Class: Polychaeta

Size: upto 42 mm. by 5 mm.

17 setigerous segments with dorsal capillary setae; 13 abdominal segments with uncinigerous pinnules. Prostomium lobed, with a median groove and two diverging glandular ridges. Edge of the nuchal organs raised into a curved pad. Buccal segment as long as the three succeeding segments. Golden yellow paleae ending in a very slender straight or curved tip, about 20-25 on either side. Eight large subulate gills, the first six disposed in two crowded groups of three, on the first setigerous segment, separated in the middle of the dorsal surface by a raised rectangular cushion. The fourth pair is set far back from the first three on the third setigerous segment. Dorsal ramus cylindrical, with a small club-shaped cirrus on the last thoracic segments. Uncinigerous pinnules shaped as a flattened knob, pedunculate and bearing a single retrogressive row of pectiniform uncini with three large bent teeth. In the abdomen, the pinnules are flattened, sub rectangular, with a very short, dorsal, blunt process. The dorsal cirri, reduced to a pedunculate small knob, persist in place of the setigerous lobes. Two anal cirri. Tube membranaceous coated with mud.

Synonym (s)
Amphicteis posterobranchiata Fauvel, 1932
Amphicteis posterobranchiata Fauvel, 1953

Common Name (s)
• Ragworm (English)
• Lugworm (English)
Economic Importance and Threats



• Bay of Bengal (Lat: 15) (Long: 90) INDIA
• Arabian Sea

Literature Source(s)
  • (2001) Sanctuary Asia natural history species: Species checklist: Reptiles Sanctuary Asia Sanctuary Magazine Available at -
  • Wehe, T and Fiege, D (2002) Annotated checklist of the polychaete species of the seas surrounding the Arabian Peninsula: Red Sea, Gulf of Aden, Arabian Sea, Gulf of Oman, Arabian Gulf Fauna of Arabia 19 7-238 Available at -
  • Khan, AS and Murugesan, P (2005) Polychaete diversity in Indian estuaries Indian Journal of Marine Sciences National Institute of Science Communication And Information Resources, CSIR, New Delhi, India, in association with Indian National Science Academy, New Delhi, INDIA 34(1) 114-119 Available at -
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Fauvel, P (1953) The fauna of India including Pakistan, Ceylon, Burma and Malaya: Annelida, Polychaeta The Indian press ltd., Allahabad 507 pp Available at - NIO, Goa

Page last updated on:2011-04-19

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