Yponomeutidae : Yponomeutinae
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Photo © Allan Eaton,  30/6/20 Kessingland

Similar Suffolk Species
Swammerdamia pyrella
Little Ermine
Paraswammerdamia albicapitella
White-headed Ermine
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Swammerdamia caesiella
Birch Ermine

(Hübner, 1796)437 / 16.015

Morley’s Final Catalogue: By no means common, on birch. Bentley Woods in late April 1895 (Mlv); Ipswich 1931 (Whit); Orford in July 1902 (Gibbs); Aldeburgh in 1892 (Ctw); Leiston (Grey), Blythbro Wood.

Recent Status: Recorded commonly in the Sandlings.

Life Style: A double brooded species that may be found from May to August. The larvae feed under a web on the top-side of Betula leaves. They pupate in a white web covered cocoon on the ground

Identification: This species is very similar to Paraswammerdamia nebulella. S. caesiella is smaller on average does not have a clear line of black dots along the base of the costa and has a clear usually double white spot on the costa before the apex. When this is distinction is unclear genitalia dissection is required for identification. More Info

Verification Grade Comment: Poorly marked / worn examples Grade 4

Recorded in 26 (45%) of 58 10k Squares.
First Recorded in 1892.
Last Recorded in 2020.
Additional Stats

Pseudoswammerdamia combinella  |  Swammerdamia pyrella >

Determination
List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
17/10/2020+26TL77 - Mildenhall
10/10/2020+25TM46 - Minsmere/Leiston
10/10/2020+25TM46 - Minsmere/Leiston
04/10/2020+26TM04 - Hadleigh
15/08/2020125TM46 - Minsmere/Leiston
Show Details | 1990 to 2020 | 2000 to 2020 |
Express Record Swammerdamia caesiella
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Copyright © Jim Wheeler 2021
   

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Wingspan: 9-13mm
Flight: Two Generations. May-Jun. Jul-Sep.
Foodplant:   Birch
Nat Status: Common
Verification Grade:  Adult: 2
 Immature Adult
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Underlying maps using Digital Map Data © Norfolk Online Lepidoptera Archive - NOLA™ - Suffolk 2021. © James Wheeler - Norfolk Moths 2007 - 2021. Data © NOLA™ - Suffolk 2021
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