PhylactolaemaPhy*lac`to*l[ae]"ma\, Phylactolaemata \Phy*lac`to*l[ae]"ma*ta\, n. pl. [NL., fr. Gr. ? to guard + ? the gullet.] (Zo["o]l.) An order of fresh-water Bryozoa in which the tentacles are arranged on a horseshoe-shaped lophophore, and the mouth is covered by an epistome. Called also Lophopoda, and hippocrepians.