Ascidia andamanensis   Oka  (Sea Squirt)
Organism information awaits expert curation
Class: Ascidiacea

Solitary ascidian, longish oval, somewhat flattened obliquely. In some places of attachment the test is expanded into a margin. Both siphons on the upper (right) side, almost sessile, with eight branchial and six atrial lobes. The surface is naked, even and smooth. Size 35 mm * 20 mm. Test is rather thick, cartilaginous and semi-transparent. Mantle is very thin and transparent. Tentacles are simple, filiform, more than 30, all of one size, arranged irregularly. Well developed branchial sac with numerous internal longitudinal bars. Meshes anterio-posteriorly long with mostly two stigmata in each. Very short wart-like papillae at the angle of the meshes. No intermediate papillae. Dorsal lamina is a simple broad membrane. No teeth or ribs. Alimentary canal forms a double loop on the left side of the branchial sac in the posterior third of the body. An oval mass of testes and ovarian follicles within the first and second loop of the intestine.

Synonym (s)

Common Name (s)
Economic Importance and Threats



• Andaman and Nicobar Islands, Andamans INDIA

Literature Source(s)
  • Sebastian, VO and Kurian, CV (1981) Indian Ascidians Mohan Primlani, Oxford & IBH Publishing Co., New Delhi 153 pp Available at - NIO, Goa

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