Trochochaeta watsoni   (Fauvel,  1916) (Marine Worm)
Organism information awaits expert curation
Class: Polychaeta

Color: Thorax fleshy orange. Abdomen white in spirit.

Body wormiform, divisible into a dorsoventrally flattened thoracic region and a cylindrical abdominal region. Prostomium fusiform, slightly notched with the crest extending slightly beyond first setiger; four eyes, two dorsal and two lateral. Postsetal lobes of notopodia and neuropodia of the first two segments lanceolate, projecting anteriorly and the neurosetae long, slender, fan-shaped ending in capillary tips directed beyond prostomium. Capillary notosetae shorter and slender. On setiger 2, neuro setae include four transparent arched acicular spines ending in round tips with alternating arched strong setae tapering to fine tips. Mouth large and ventral, the anterior margin of the second segment forming the lower lip. Fan-shaped slender capillary notosetae in the 3rd setiger. The neurosetae include 4-6 stout curved acicular spines with black or dark brown shades. The post-setal lobes elongated and ovoid and not serrated. In setiger 4, the notosetae are long thin capillary, the neurosetae shorter, slightly stouter tapering to fine tips. The post-setal lobes oval. The rest of the thoracic segments, setigers, 5-9 have strongly limbate neurosetae with curved tapering fine tips; dark brown to black as the acicular spines of setiger 3. The limbate curved margin striated. Capillary neurosetae long, thin and doubly curved, distinct in the smaller specimen. The notosetae, straight or slightly curved, capillary, appear like fan-shaped bundles. No spinuous appearance. In the doubly curved neurosetae also the spinous appearance is not much clear, Post-setal lobes of the thoracic setigers ovoid. Notopodia absent from setiger 10 onwards. The neuropodial setae are transitional. Conical neuropodia with 3-4 acicular setae having fine curved tips and in the posterior region 1-3 slender acicular setae and fine hairy capillary setae. Digitiform neuropodial post-setal lobe with subpodial undulating thin flanges extending posteriorly to the next setiger. The posterior region continues to the achaetous segments and end with pygidiura having fleshy conical lobes.

Synonym (s)
Disoma watsoni Fauvel, 1916
(Objective synonym)
Trochochaeta watsoni Pettibone, 1963

Common Name (s)
Economic Importance and Threats

Habitat:  Muddy


• Kerala, Off Azhikode INDIA (Record: 11/01/1968) (Depth: 27-54 mts)
• Kerala, Azhikode INDIA

Literature Source(s)
  • Achari, GPK (1968) Studies on new or little known Polychaetes from Indian seas 1. Trocmochaeta watsoni (Fauve) and Poecilochaetus serpens Allen Journal of the Marine Biological Association of India Marine Biological Association of India 10(1) 99-106 Available at -
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • James, PSBR ; Thomas, PA ; Pillai, CSG and Achari Kumaraswamy, GP (1969) ´╗┐Catalogue of types and of sponges, corals, polychaetes, crabs and echinoderms in the reference collections of the Central Marine Fisheries Research Institute Bulletin of Central Marine Research Institute CMFRI, Cochin 7 1-66 Available at -

Page last updated on:2011-03-16

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