Willem Kolvoort Onderwaterfotografie
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Beeldschoonwater, streams in Drenthe
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Underwater Insects
Water boatman ( Corixa punctata )
Pond olive ( Cloëon dipterum ) spawning
Pond olive ( Cloëon dipterum ) larvae
Damselfly ( Erythroma najas ) on yellow water-lily
Caddis fly ( Phryganea spec. ) larvae and Stone loach
Caddis fly ( Phryganea spec. ) larva
Caddis fly ( Phryganea spec. ) larva
Caddis fly ( Phryganea spec. ) larva
Caddis fly ( Phryganea spec. ) larvae
Caddis fly ( Phryganea spec. ) larvae
Caddis fly ( Phryganea spec. ) larvae
Dragonfly larva
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