Umbraculum umbraculum   (Roeding,  1798) (Sea Slug)
Organism information awaits expert curation
Class: Gastropoda

Image copyrights: Atoll Shells

Size: Max length 12.0 cm TL (male)

Large external shell covering the dorsum. The shell is usually covered with encrusting plant and animal growths. The body is circular, with large pustules. Even when crawling the animal does not elongate and the position of the head can only be determined by the tubular rhinophoral tentacles which extend out from beneath the shell. Below these tentacles the body is split by a "mid-anterior cleft" in which the permanently protruded penis sits and the mouth opens. The radula is very broad with many small rasping teeth. The proboscis does not evert, so in feeding, the anterior cleft must be spread open so that the mouth can be pressed against the sponge colony.

Synonym (s)
Patella ombracula Blainville, 1819
Umbraculum bermudense (Morch, 1875)
Umbraculum botanicum Hedley, 1923
Umbraculum indicum (Lamarck, 1819)
Umbraculum mediterraneum (Lamarck, 1819)
Umbraculum ovalis (Carpenter, 1856)
Umbraculum plicatulum (Martens, 1881)
Umbraculum pulchrum Lin, 1981
Umbraculum sinicum (Gmelin, 1791)
Umbrella indica Lamarck, 1819
Umbrella mediterranea Lamarck, 1819

Common Name (s)
• Umbrella Pleurobranch (English)
Economic Importance and Threats

Habitat:  Demersal
Prey:  Sponges


• Tamil Nadu, Gulf of Mannar (Lat: 8.5) (Long: 79) INDIA

Literature Source(s)
  • Subba Rao, NV (2003) Indian seashells Records of the Zoological Survey of India ZSI, Kolkata (Part 1) 416 pp Available at - NCL, Pune
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Global Biodiversity Information Facility (GBIF) Available at -
  • Eddie, H Hardy's internet guide to marine gastropods Available at -
  • (1998) Sea Slug Forum Australian Museum Available at -
  • Sealifebase Available at -

Page last updated on:2011-03-10

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