The Essex emerald (Thetidia smaragdaria) is a moth of the family Geometridae . 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 2004 the first record from Sweden was made. But they are still an ongoing Subspecies At the nature reserve in Kent, United Kingdom
The wingspan is 27–35 mm. There is one generation per year with adults on wing from mid June to mid July.
- Thetidia smaragdaria smaragdaria
- Thetidia smaragdaria gigantea Milliere, 1874
- Thetidia smaragdaria maritima Prout, 1935
- Thetidia smaragdaria volgaria Guenee, 1858
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