70.236 : 1915 : 7636
Geometridae : Ennominae

September Thorn

ENNOMOS erosaria ([Denis & Schiffermüller], 1775)
Picture
Life Cycle Guide
Picture
Description
Wingspan: 38-42mm
Worldwide Distribution: Europe to Caucasus
UK Distribution: Well distributed/fairly frequent in England and Wales : Northern England/Scotland-local : Channel Isles-Jersey-local/occasional
UK Conservation Status -
  • NERC S.41 : 2008 (England) & NERC S.42 : 2009 (Wales) - Species "of principle importance for the purpose of conserving biodiversity
  • Common = >300 10Km Squares
  • BAP : 2007 - Priority Species
  • Endangered
European Conservation Status -
  • Least Concern
Original Species Name -
  • Phalaena erosaria ([Denis & Schiffermüller], 1775)
Type Species - Ennomos
  • Eugonia autumnaria Werneburg, 1859
Type Locality -
  • Austria-near Vienna
Flight Period: South-Mid June to October : Elsewhere-July to early October
Habitat: Woods : Gardens : Parkland
Similar Species -
  • August Thorn Ennomos quercinaria Hufnagel, 1767
Larva: The final instar larva is in shades of brown or grey once again giving the appearance of a food plant twig thus providing maximum camouflage.At abdominal segments 4 & 7 and behind the head there are the appearance of lateral buds on top of the the larva giving the appearance of new growth.
Pupa: Pupates among spun leaves
Overwinters as: Ovum
Observations: The antemedian cross-line on the August Thorn E.quercinaria Hufnagel, 1767 turns at a sharp angle back to the basal area just before it reaches the costa.
The postmedian cross-line for the similar species also kinks just before the costa whereas the September Thorn cross-line is a smooth line to the costa.
There is a steady convergence of the cross-lines from the costa to the dorsum.

The moth is attracted to light and is a regular visitor to the light trap where it can appear in good numbers.
Photo Gallery
Larval Food Plants Worldwide
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Taxonomy
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Type Species - ENNOMOS:

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Forms/Aberrations:
Animalia
Eumetozoa
Arthropoda
Hexapoda
Insecta
Lepidoptera
Geometroidea
Geometridae
Ennominae
Ennomini
ENNOMOS Treitschke 1825
Ennomos erosaria ([Denis & Schiffermüller], 1775)
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Eugonia autumnaria Werneburg, 1859
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PHALAENA erosaria ([Denis & Schiffermüller], 1775)
= Ennomos erosarius Denis & Schiffermüller, 1775
= Phalaena quercinaria, Borkhausen, 1794
= Ennomos tiliaria Hübner, 1799
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Ankündung eines systematischen Werkes von den Schmetterlingen der Wienergegend : Title Page : p.103 - n.4
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Austria-near Vienna
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E.e.f.tiliaria Hübner, 1788-wings straw yellow
E.e.f.aurantiaca Lempke, 1951-Wing base colour can be orange
E.e.f.approximata Lempke, 1951-cross-lines closr together
E.e.f.tangens Lemke, 1951-cross-lines touch
E.e.f.obsoleta Lempke, 1951-cross-lines missing
E.e.f.albescans Lempke, 1970-wing base colour whitish
E.e.f.rufescens Lempke, 1970-wing base colour russet
E.e.f.fuscata Lempke, 1970-dark tones beyond cross-lines
E.e.f.nigrolineata Lempke, 1970-specled with dark tones beyond cross-lines,cross lines black
E.e.f.angularia Demaison, 1918-cross line join up then break towards inner margin