Thetys vagina


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Present in tropical and temperate waters of the Pacific, Atlantic and Indian Ocean.
Occurs to depths of about 150 m.
Aggregate generation: to 250 mm; solitary generation: to 300 mm
Filter feeders; phytoplankton and other small particles.
Medusae, siphonophores, ctenophores, heteropods, sea turtles, marine birds and many fish.
Useful Facts or Characters: 

The aggregate generation zooid possesses a thick, rigid tunic and is covered in small protubrances.  The gut causes a swelling of the tunic at the posterior end.  The aggregate has five body muscle bands.  The solitary generation zooid posesses a very thick, rigid tunic covered in small protubrances and two conspicuous trailing projections that sometimes appear dark green to black.  It has twenty or more body muscle bands.  

Natural History: 

The largest species of salp along the West Coast of the U.S.


Bone, Q. (1998) The biology of pelagic tunicates. Oxford University Press, Oxford.

Wrobel, D. and Mills, C. (1998) Pacific Coast pelagic invertebrates:  a guide to the common gelatinous animals.  Sea Challengers, Monterey Bay Aquarium, Monterey, CA.

Yount, J.L. (1954) The taxonomy of the Salpidae (Tunicata) of the central Pacific Ocean. Pacific Science 8: 276-330.