Biology/Natural History: Cyclostome bryozoans are mostly marine, have tubular, calcareous zooecia, and the aperture is usually circular. They have no operculum. Embryos develop in ovicells which are seen as swellings on the colony. The current created by the cilia in this species is surprisingly strong. I watched particles from a distance of 4-5x the length of the lophophore tentacles become entrained in the current, drawn toward the tentacles, and blown away again, all within about 1/2 second. This species does not have a long planktonic stage.