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Essex emerald
Species of moth From Wikipedia, the free encyclopedia
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The Essex emerald (Thetidia smaragdaria) is a moth of the family Geometridae. The species was first described by Johan Christian Fabricius in 1787 as Phalaena smaragdaria.[1] It is distributed throughout the Palearctic region with records from many European countries. The British subspecies Thetidia smaragdaria maritima was last seen in 1991 in Kent and is now presumed extinct.[2] In 2004 the moth was first recorded from Sweden.

The wingspan is 27–35 mm. There is one generation per year with adults on wing from mid-June to mid-July.
The larvae feed on Artemisia maritima and Achillea millefolium. Larvae can be found from July to June the following year. It overwinters in the larval stage.
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Subspecies
- Thetidia smaragdaria smaragdaria
- Thetidia smaragdaria gigantea Milliere, 1874
- Thetidia smaragdaria maritima Prout, 1935
- Thetidia smaragdaria volgaria Guenee, 1858
References
External links
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