Entoprocta, or Kamptozoa, is a phylum of tiny sessile aquatic animals ranging from 0.1 to 7 millimetres (0.004 to 0.28 in) long. Mature individuals are goblet-shaped, on relatively long stalks. They are filter-feeders, with a crown of tentacles whose cilia generate water currents towards the mouth. Both the mouth and anus lie inside the crown. The superficially similar Bryozoa (Ectoprocta) have the anus outside a 'crown' of hollow tentacles. Most families of entoprocts are colonial, and all but 2 of the 150 species are marine. A few solitary species can move slowly.