Eudistoma ovatum   (Herdman,  1886) (Sea Squirt)
Organism information awaits expert curation
Class: Ascidiacea

Image copyrights: FLMNH

Size: 2 cm in length (male)

Color: Sandy, grey

Colonies firm; upper surface of the colony slightly convex towards the middle and thin at the edges; sand evenly distributed throughout the test. Faecal pellets not crowded and test transparent. Circular systems clear and devoid of sand; Zooids are evenly placed.
Zooids are small; Contracted thorax narrow; atrial siphon long and muscular. Lobes rounded. Longitudinal and transverse muscle present; longitudinal muscles extend into abdomen. Gonads and stomach in the posterior.

Synonym (s)
Eudistoma arenaceum (Sluiter, 1901)
Polycitor arenaceus Sluiter, 1909
(Original combination)
Polycitor scaber Sluiter, 1909
(Original combination)
Psammaplidium ovatum Herdman, 1886
(Original combination)

Common Name (s)
Economic Importance and Threats

Habitat:  Demersal


• Tamil Nadu, Mandapam (Lat: 9.28) (Long: 79.12) INDIA
• Tamil Nadu, Morepannai INDIA
• Tamil Nadu, Keezha Kadiappattanam INDIA
• Tamil Nadu, Tiruchendur INDIA
• Tamil Nadu, Chinna Ervadi INDIA
• Tamil Nadu, Mandapam INDIA

Literature Source(s)
  • Rao, DVS (2005) Comprehensive review of the records of the biota of the Indian Seas and the introduction of non-indigenous species Aquatic Conservation: Marine and Freshwater Ecosystems John Wiley and Sons, Ltd. 15(2) 117-146 Available at -
  • van der Land, J UNESCO-IOC Register of Marine Organisms Available at -
  • Sealifebase Available at -
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Florida Museum of Natural History Available at -
  • Meenakshi, VK; Renganathan, TK; Senthamarai, S and Jeyalakshmi, J (2003) Marine biodiversity - Taxonomy of Indian Ascidians Technical report Available at - Biodiversity Informatics Group, NIO, Goa
  • Meenakshi, VK. (2002) Occurrence of a new species of colonial ascidian- Eudistoma kaverium sp.nov. and four new records of Eudistoma to Indian coastal waters Indian Journal of Marine Sciences Scientific Publishers 31(3) 201-206 Available at -

Page last updated on:2011-02-07

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