Fabricius, 1780
Body sac- or vase-shaped, often compressed in the tentacular plane. Ciliary comb rows equal in length, extending from the aboral pole to about three quarters the distance toward the mouth. Four meridional canals of each broad side connected orally by means of oral forks of the paragastric canal. Meridional canals with numerous diverticulae, no anastomoses.
Color: mature specimens pink, especially along meridional canals and comb rows. Up to 150 mm in height.