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 |