Tiny particles of stones

Harry Luft Verne FletcherThe water garden, Londres, John Lehmann, 1951, p. 176.

The larvae of Caddis Flies, May Flies and Alder Flies all spend their life in the water. The most interesting is that of the Caddis Fly, for it makes a case out of any material available, leaves, twigs, or, which seems to be the most common, tiny particles of stone. They are often found attached to the underside of stones which may be in the pool. The China Mark Moth larva also spends its larval stage in the water , and, like the Caddis Fly makes a case but of tiny leaves such as those of the Duckweed.