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Biology

Very little is known of the ecology of the species, but it is known that the larvae live and feed inside alder leaves (2). Larvae produce short, serpentine leaf mines culminating abruptly in an enlarged leaf edge 'blotch'. When fully grown, larvae pupate in a rounded leaf edge cocoon. Adults have been found throughout the summer from May to September. It seems likely that they emerge in July and August and hibernate as adults. (This is known to be the case with the commoner closely related R. fagi). Other species of Rhynchaenus are known to produce sound by 'stridulation' in a similar way to grasshoppers; it is not known whether R. testaceus shares this characteristic (5).

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Source: ARKive

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