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Lesser Treble-bar
Aplocera efformata (Guenée, 1857)
Geometridae: Larentiinae
1868 / 70.193
Photo © Bill Urwin

Similar Norfolk 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
Norfolk Status
Much rarer than Treble-bar (A.plagiata).

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 from below.

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 19 (26%) of 74 10k Squares.
First Recorded in 1940.
Last Recorded in 2022.

Latest 5 Records
Date#VC10k Area
08/06/2022127TG20 - Norwich
11/09/2021128TF41 - W.Walton/Walpole
08/09/2021128TF41 - W.Walton/Walpole
18/08/2021128TF93 - Fakenham/Walsingham
06/06/2021127TG20 - Norwich
Further info: Aplocera efformata
 
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