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Not sure of the species but these are the nets formed by the caddis fly. There are three families of caddis flies who spin nets. The aquatic caddisfly larvae secrete silk through their mouths from modified salivary glands--siIk similar to that spun by the caterpillars of butterflies and moths. And, certain caddisfly larvae construct silken nets to capture food from the water--structures similar to those used by commercial fishermen.
Polycentropid larvae I think
Spotted on Jul 24, 2011
Submitted on Jul 24, 2011