• (a.) Having the pallium, or mantle, acting as a gill, as in brachiopods.
Pal`li·o·bran'chi·ate adjective [ See Pallium , and Branchia .] (Zoology) Having the pallium, or mantle, acting as a gill, as in brachiopods. 
palliobranchiate The tubes of the mantle being assumed to be branchia or gills.