Practice question

Lophophore is complex tentacular ciliated feeding organ definitively characteristic of lophotrochozoan phyla Phoronida, Brachiopoda and Bryozoa. Morphologically consists of elevated ridge bearing hollow tentacles each containing extension of mesocoel coelom and cilia generating downstream water current toward mouth, filtering phytoplankton and detritus via mucus-ciliary mechanism. Shape variable: circular, U-shaped horseshoe, spiral supported by brachidium in brachiopods. Beyond feeding assists respiration and brooding. Hence primarily sessile suspension-feeding adaptation for aquatic microphagous lifestyle maximizing particle capture efficiency in low-energy benthic environments and competitive sessile communities where current generation crucial.