Styela clava

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Styela clava
Styela clava.JPG
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Tunicata
Class: Ascidiacea
Order: Stolidobranchia
Family: Styelidae
Genus: Styela
Species: S. clava
Binomial name
Styela clava[1]
Herdman, 1881

The Stalked Sea Squirt, Styela clava, is a solitary, hermaphroditic, ascidian tunicate that is found off Australia[2] and New Zealand,[3] both coasts of North America,[4] and Europe.[5]

These sea squirts are characterized by their brown or yellow, rough and wrinkled surface. They can grow to be about 6 in (15 cm) tall and can be found on lobster pots, pilings, and fishing nets. This species of sea squirts is native to Korea and Japan. It may have been carried to New England waters from Europe (where it arrived in the early 1950s) in ballast water or ship fouling.[6]

Styela clava is called Mideodeok(미더덕) in Korea and primarily consumed in there as food.

Other names[edit]

  • Club or Clubbed Tunicate
  • Solitary Sea Squirt
  • Rough Sea Squirt
  • Leathery Sea Squirt
  • Asian Sea Squirt


Populations around Los Angeles, CA grow 1-1.5 cm/month for 6 months, reaching maturity and slowing growth at about 9 cm in size. Broadcast spawning occurs late spring to early fall. They occur to at least 25 m deep, and filter approximately 150 mL of water / minute / gram body weight.[7]


  1. ^ "Styela clava". Integrated Taxonomic Information System. Retrieved February 17, 2007. 
  2. ^ Hewitt, C. et al. (1999). "Marine biological invasions of Port Phillip Bay, Victoria.". Centre for Research on Introduced Marine Pests CSIRO Technical Report (20): 344. 
  3. ^ Davis MH and Davis ME (2006). "Styela clava (Tunicata: Ascidacea) a new edition to the fauna of New Zealand.". Porcupine Marine Natural History Society Newsletter 20: 23–28. 
  4. ^ Wonham MJ and Carlton JT (2005). "Trends in marine biological invasions at local and regional scales: the Northeast Pacific Ocean as a model system.". Biological Invasions 7 (3): 369–392. doi:10.1007/s10530-004-2581-7. 
  5. ^ Davis MH and Davis ME (2005). "Styela clava (Tunicata: Ascidacea) a new edition to the fauna of the Portuguese coast". Journal of the Marine Biological Association of the United Kingdom 85 (2): 403–404. doi:10.1017/S002531540501132Xh. 
  6. ^ RH Morris, DP Abbott & EC Haderlie. 1980. Intertidal Invertebrates of California. Stanford University Press: Stanford, CA. p. 207-208.

External links[edit]