Essex emerald

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Essex emerald
Thetidia smaragdaira.jpg
Scientific classification edit
Kingdom: Animalia
Phylum: Euarthropoda
Class: Insecta
Order: Lepidoptera
Family: Geometridae
Genus: Thetidia
Species: T. smaragdaria
Binomial name
Thetidia smaragdaria
(Fabricius, 1787)
  • Phalaena smaragdaria Fabricius, 1787
  • Phorodesma castiliaria Staudinger, 1892
  • Euchloris maritima Prout, 1935
  • Geometra prasinaria Eversmann, 1837
  • Geometra gigantea Milliere, 1874
  • Geometra volgaria Guenee, 1858

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

Illustration from John Curtis's British Entomology Volume 6

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.


  • Thetidia smaragdaria smaragdaria
  • Thetidia smaragdaria gigantea Milliere, 1874
  • Thetidia smaragdaria maritima Prout, 1935
  • Thetidia smaragdaria volgaria Guenee, 1858

External links[edit]