The sparkling beetles were prioritised for conservation due to vulnerability to flooding and declining numbers.
The site at York St John has been specially developed with "hundreds of tansy plants cultivated to sustain the rare beetles", a spokesperson for the university said. A university spokesperson said the first breeding pairs of beetles were introduced last summer, but had "failed to thrive due to scorching temperatures".
Dr Geoff Oxford, from the Tansy Beetle Action Group, said "The beetle is known as the Jewel of York because for a long time it was believed to only be living here.
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