cryptocyst (noun; Greek
kryptos, hidden;
kystis, bladder): (
Bryozoa: Gymnolaemata) 1. One of the two basic wall morphologies of bryozoans consisting of wholly interior walls, leaving a superficial hypostegal coelom uniting contiguous zooids
See also: gymnocyst. 2. A calcareous plate that functions as a hydrostatic organ in Cheilostomata.