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Dahlica triquetrella
Narrow Lichen Case-bearer (Hübner, 1813)
Psychidae: Naryciinae
176 / 11.003
Photo © Chris Knott,  26/04/2022 - Great Ellingham, Emerged from overwintered larval case

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Similar Species: None
Foodplant:   Lichens, and decaying plants
Nat Status: pRDB2
Verification Grade:  Adult: 3  Case: C3
Status
Rare.
Hard to distinguish between other related species.
The only way to be certain of the ID of larval cases is to examine the exuviae head-plate under a microscope.

Only the parthenogenetic (does not require the male to reproduce) wingless female of Dahlica triquetrella has been recorded in Britain.

Listed in 1873-4 at Brandon said to be 'abundant on old palings - everything reared apterous females' (C. Barrett)

Two cases of Dahlica triquetrella were found at Breydon saltmarsh in 2012.(J.R.Langmaid, 06/06/12)

Laval case found at Snettisham in February 2022, with wingless parthenogenetic female emerging and laying eggs inside the larval case in March. (J. Stroud, 11/02/22)

Verification Grade Comment: Parthenogenetic

Retained Specimen / Photograph will be Required.

Case: A good quality photo or specimen of the case and plant/pabulum and the bred moth is required.

Recorded in 8 (11%) of 74 10k Squares.
First Recorded in 1874.
Last Recorded in 2025.
Additional Stats

Latest 10 Records
Date#VC10kArea
01/01/2025128TL79Mundford
02/12/2024128TM09Great Ellingham
16/10/20241028TM09Great Ellingham
08/10/2024828TM09Great Ellingham
02/10/2024128TL79Mundford
26/09/2024128TM09Great Ellingham
13/09/2024128TF63Snettisham
07/04/2024128TL79Mundford
07/04/2024128TM09Great Ellingham
07/04/2024127TG10Cringleford / Intwood
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