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Biology

Very little is currently known about the ecology of this species. The adults are associated with bracken (Pteridium aquilinum), and feed on climbing corydalis (Ceratocapnos claviculata), leaving distinctive 'half-moon' feeding damage on the leaves (5). Studies have shown that in captivity, the adults are usually nocturnal, and hide in bracken litter during the day (5). Adults have been found in the wild between March and August and December and January. Highest numbers occur from late April to the end of June. This suggests that this species breeds in summer, and the new generation of adults overwinters  after emerging in August. However, more research is needed to determine if this is the case (2). Larvae belonging to this group of weevils live inside plant roots, however, the larvae of this weevil have not yet been found in the wild, and so the details of its life cycle are a mystery. The roots of climbing corydalis are too thin to accommodate them, and it is thought they may live inside bracken rhizomes, although searches have so far proven unsuccessful (2).

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Source: ARKive

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