Essex emerald

Essex emerald
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Geometridae
Genus:	Thetidia
Species:	T. smaragdaria
Binomial name
Thetidia smaragdaria (Fabricius, 1787)
Synonyms
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 Geometridae family . 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.

Subspecies

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

External links

• European Butterflies and Moths
• Fauna Europaea
• UK Moths