Creseis virgula

Taxon-Order: 
Thecosomata

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Distribution: 
Found in the Atlantic and the Pacific, usually south of Point Conception.
Habitat: 
Epipelagic.
Size: 
5 - 10 mm
Diet: 
Phytoplankton and protozoa.
Useful Facts or Characters: 

Transparent uncoiled shell that is curved dorsally.  The shell is long and narrow.

Natural History: 

An escape response is to drop the mucus feeding web and sink with the shell pointed vertically.  Several forms reported; here no attempt is made to distinguish them.

References: 

video source: http://www.youtube.com/watch?v=qwjIE8KuOso