Image of six cadddisfly Helicopsyche boreal shells.

Grazers 2. The caddisfly Helicopsyche boreals scrapes algae from rock surfaces. This species uses silk
to fashion together a case of fine sand grains that spiral like a snail shell. Snails are algal grazers too.
Photo reprinted,by permission, from Skip Hodges.

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Some images 2004

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