Galerucella calmariensis

Galerucella calmariensis is a species of leaf beetle in the family Chrysomelidae. It is commonly known as the black-margined loosestrife beetle and is native to Europe and Asia where both adults and larvae feed on purple loosestrife (Lythrum salicaria). It has been introduced in North America as a biological control agent for purple loosestrife. =...
Found on http://en.wikipedia.org/wiki/Galerucella_calmariensis
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