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Lesser Treble-bar
Aplocera efformata (Guenée, 1857)
Geometridae: Larentiinae
1868 / 70.193
Photo © Tuck Mr N,  05/08/2017 - Thetford Forest CC Site

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Similar Species
Treble-bar
Aplocera plagiata
Forewing: 16-19mm.
Flight: Two generations May-June. Aug-Sept.
Foodplant:   St John's-worts.
Red List: Least Concern (LC)
GB Status: Common
Verification Grade:  Adult: 3
Status
Much rarer than Treble-bar.

Lesser Treble-bar is usually slightly smaller, with less intense dark cross-bands.
The most reliable way to separate the two species is by looking at the tip of the abdomen.

Treble-bar Male has a straighter, more pointed abdomen tip.
Female showing a distinctive tubular shape to the terminal segment of the abdomen.

Lesser Treble-bar Male abdomen is shorter and blunter, with slightly curved claspers.
Female abdomen blunt. This is less obvious and care should be taken.

(see abdomen comparison diagram)

Please retain / photograph all possible Lesser Treble-bar specimens.

Retained Specimen / Photograph will be Required.

Recorded in 21 (28%) of 74 10k Squares.
First Recorded in 1940.
Last Recorded in 2023.

Latest 10 Records
Date#VC10kArea
22/08/2023128TF62King's Lynn
26/06/2023+28TL79Cranwich Heath
03/09/2022128TF51Walpole Highway
29/08/2022127TG20Poringland
08/06/2022127TG20Poringland
11/09/2021128TF41West Walton
08/09/2021128TF41West Walton
18/08/2021128TF93Thursford
06/06/2021127TG20Poringland
06/09/2020128TF74Brancaster
Further info: Aplocera efformata
 
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