 Leuconid sponges grow to over in diameter, and the fact that growth in any direction increases the number of choanocyte chambers enables them to take a wider range of forms, for example "encrusting" sponges whose shapes follow those of the surfaces to which they attach.All freshwater and most shallow-water marine sponges have leuconid bodies.The networks of water passages in glass sponges are similar to the leuconid structure.