Platynereis polyscalma   Chamberlin,  1919 (Marine Worm)
Organism information awaits expert curation
Class: Polychaeta

Size: 10-20 mm.

Atocous condition still unknown. Heteronereis stage: Prostomium snout-like, protruding, broadly rounded in front. Tentacles small, ventral, pointing backwards; the palps have a similar disposition, but concealed under the head and lowered over the mouth. Four enormous eyes with lenses, the anterior pair much larger than the posterior and nearly ventral in position. Proboscis; III=pectinate cluster; IV=crescentic clusters of small pectinate denticles; V=0 (or 1?); VI=on each side a round or oval cluster of pectinate paragnaths; VII-VIII a row of several oval clusters. Tentacular cirri reaching backwards to the 6th-9th segment. Anterior dorsal cirri of the male swollen, the succeeding ones crenulated. Two large anal cirri with a filiform tip and a rosette of papillae. Swimming bristles compound, with long oval blades, bearing, on one side, below the apex, very long and spine like delicate marginal teeth projecting at an angle. In the last segments simple setae with a ribbed blade.
In the male specimens, the epitocous transformations commence on the 15th setigerous segment. The inferior ventral ligule has three processes and the dorsal lamella of the ventral cirrus is bifurcated. The last 15-16 segments resemble a kind of narrow, slender, tail but the appearance is rather delusive as all these segments are provided with epitocous bristles and lamellae, only the ventral division is much smaller. The anus is surrounded by a rosette of minute hollow papillae and the pygidium bears two anal filiform cirri.

Synonym (s)
Platynereis integer Treadwell, 1920

Common Name (s)
Economic Importance and Threats



• Andaman and Nicobar Islands, Great Nicobar Island INDIA
• Andaman and Nicobar Islands, Andaman Islands INDIA

Literature Source(s)
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) 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 -
  • 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:2011-03-18

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