Nant Wern Ddu: Invertebrate & water
Description
Nant Llysiog, above Llwyn-on. One of two branches of Nant Wern Ddu. November 1971
Caddis larvae tubes of pebbles and sand. Nant Wern Ddu
Marys species name: Caddis
Scientific name: Trichoptera
Common name: Caddisfly
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