Reductoderces cawthronella is a moth of the Psychidae family. It was described by Alfred Philpott in 1921 and named in honour of the Cawthron Institute. It is endemic to New Zealand and has been collected in Nelson on the Maitai Valley side of the Botanical Hill. The larvae inhabits a fragile, pear shaped case and it has been hypothesised that they are lichen or alga browsers. Larvae pupate at the end of June and adults emerge at the beginning of August until the middle of October.

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