Phlebobranchia

(from the article `tunicate`) ...simple, unfolded and without longitudinal vessels or bars; digestive tract and genital organs in posterior part of body.Order PhlebobranchiaGills ...
Found on http://www.britannica.com/eb/a-z/p/58

Phlebobranchia

Phlebobranchia is a suborder of sea squirts in the order Enterogona. The group includes both colonial and solitary animals. They are distinguished from other sea squirts by the presence of longitudinal vessels in the pharyngeal basket. This provides the etymology of their name: in ancient greek, φλέψς, φλεβός means `blood vessel`. An .....
Found on http://en.wikipedia.org/wiki/Phlebobranchia
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