Botryllus purpureus   (Oka)  1932 (Sea Squirt)
Organism information awaits expert curation
Class: Ascidiacea

Size: Zooids 1 mm in length

Color: Brown, purple or pink in live condition.

Colonies from large irregular investing sheets on the substratum. Test very thin and transparent with sand particles embedded in it and distributed on the surface. Zooids and terminal ampullae of test vessels inconspicuous. Circular system of arrangement of zooids observed.

Branchial aperture terminal with a smooth round border. Atrial aperture narrow. Upper border of atrial opening produced into a large atrial lip. Pigment cells lie scattered on the body wall. 10 branchial tentacles. Branchial sac has 7 rows of stigmata with 14-16 stigmata per row. Gut forms a simple loop across the posterior end of the left side of the body. Stomach small, barrel shaped or spherical with 8 conspicuous folds. Caecum long, curved and swollen at the tip. Anus opens at the level of the fourth row, atrial aperture between the second and fourth row of stigmata. Gonads one on each side of the body. Testis formed of ten spherical follicles.

Synonym (s)

Common Name (s)
Economic Importance and Threats

Habitat:  Rocky, Coastal


• Tamil Nadu, Tuticorin Harbour INDIA (Record: 2006)
• Tamil Nadu, Tirunelveli Coast, Perumanal INDIA (Record: 2006)

Literature Source(s)
  • Meenakshi, VK and Senthamarai, S (2006) First report on two species of ascidians to represent the genus Botryllus Gaertner, 1774 from Indian waters Journal of the Marine Biological Association of India The Marine Biological Association of India, Cochin 48(1) 100-102 Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -

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