Erannis is a geometer moth

Geometer moth

The geometer moths or Geometridae are a family of the order Lepidoptera...

 genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of the subfamily Ennominae

Ennominae

Ennominae is the largest subfamily of the geometer moth family with some 9,700 described species in 1,100 genera. They are usually fairly small moth species, though some grow considerably larger. This subfamily has a global distribution. It includes some species that are notorious defoliating...

. It is placed by some entomologists in the tribe

Tribe (biology)

In biology, a tribe is a taxonomic rank between family and genus. It is sometimes subdivided into subtribes.Some examples include the tribes: Canini, Acalypheae, Hominini, Bombini, and Antidesmeae.-See also:* Biological classification* Rank...

 Erannini as the type genus, but others merge this group into the tribe Boarmiini

Boarmiini

The Boarmiini are a large tribe of geometer moths in the Ennominae subfamily.-Description and systematics:...

 or Bistonini

Bistonini

The Bistonini are a tribe of geometer moths in subfamily the Ennominae. As numerous ennomine genera have not yet been assigned to a tribe, the genus list is preliminary. In addition, the entire tribe is sometimes merged into a much-expanded Boarmiini...

.

The adults of these smallish moths typically live in the crowns of their host trees. The genus is most diverse in the Holarctic

Holarctic

The Holarctic ecozone refers to the habitats found throughout the northern continents of the world as a whole. This region is divided into the Palearctic, consisting of Northern Africa and all of Eurasia, with the exception of Southeast Asia and the Indian subcontinent, and the Nearctic,...

; few of the 12 or so known species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 occur in adjacent regions.

Selected species

Erannis species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 include:

• Erannis ankeraria (Staudinger, 1861)
• Erannis caspica László, 2003
• Erannis declinans (Staudinger, 1879)
• Erannis defoliaria – Mottled Umber
  Mottled Umber
  The Mottled Umber is a moth of the family Geometridae. It is a common species throughout the Palearctic region and the Near East....
  
  
• Erannis golda Djakonov, 1929
• Erannis jacobsoni
  Erannis jacobsoni
  Jacobson's Spanworm is a moth of the Geometridae family. It is found in Europe and Asia .The larvae feed on Larix species, including Larix gmelinii and Larix sibirica....
  
  Djakonov, 1926
• Erannis kashmirensis László, 2003
• Erannis potopolskii Viidalepp, 1988
• Erannis tiliaria
  Erannis tiliaria
  The Linden Looper , also known under the rather ambiguous name "winter moth", is a moth of the Geometridae family...
  
  – Linden Looper, "winter moth
  Winter Moth
  The Winter Moth is a moth of the family Geometridae. It is an abundant species of Europe and the Near East and one of very few Lepidoptera of temperate regions in which the adults are active in the depth of winter....
  
  "
• Erannis vancouverensis (sometimes in E. tiliaria)

Synonyms

The genus has also beenm listed under the following now-obsolete alternate names:

• Chimadia Speyer, 1839
  
• Erranis (lapsus
  Lapsus
  A lapsus is an involuntary mistake made while writing or speaking. According to Freud's early psychoanalytic theory, a lapsus represents a missed deed that hides an unconscious desire....
  
  )
  
• Hibernia (lapsus)
  
• Hyberna (lapsus)
  
• Hybernia Berthold, 1827
  
• Lampetia Stephens, 1827
  
• Thriptera Gistel, 1848 (non Solier, 1836: preoccupied)