| Family: | Cosmopterigidae | 
| Subfamily: | Cosmopteriginae | 
| Genus: | Cosmopterix | 
| Species: | lienigiella | 
| Authority: | Lienig & Zeller, 1846 | 


The abundance in each month is indicated as follows:
 No records
 No records Very occasional
 Very occasional Irregular
 Irregular Uncommon
 Uncommon Off-peak, but not unusual
 Off-peak, but not unusual Off-peak, but not unusual
 Off-peak, but not unusual Main flight time
 Main flight time| J | F | M | A | M | J | J | A | S | O | N | D | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Adult |  |  |  |  |  |  |  |  |  |  |  |  | 
| Larval |  |  |  |  |  |  |  |  |  |  |  |  | 
| Site | Date | Quantity | Recorder | Stage | 
|---|---|---|---|---|
| The Wilderness, nr. Rooksley (SZ58) | 22/09/1977 | - | AMEmmet, EC Pelham-Clinton, Dr JD Bradley, RWJ Uffen | Mine | 
| Brading (SZ68) | 13/10/2005 | - | David G Green & Susan A Clarke | Larval | 
| Centurion's Hill (SZ68) | 13/10/2005 | - | David G Green & Susan A Clarke | Larval | 
| Freshwater (SZ38) | 14/10/2005 | - | David G Green & Susan A Clarke | Larval | 
| Yarmouth (SZ38) | 08/10/2006 | one | J R Langmaid, D T Biggs, T J Norriss, M J Wall | Mine | 
| Yarmouth (SZ38) | 08/10/2006 | - | John R Langmaid | Mine (vacated) | 
| Seaview (SZ69) | 12/10/2006 | - | David Biggs | Mine | 
| Afton Marsh (SZ38) | 03/07/2014 | - | Brian Elliott | Adult | 
| Afton Marsh (SZ38) | 07/06/2016 | one | Stephen Plummer | Adult | 
| Afton Marsh (SZ38) | 11/07/2016 | two | Iain Outlaw | Adult | 
| Afton Marsh (SZ38) | 15/07/2016 | five | Iain Outlaw | Adult | 
| Afton Marsh (SZ38) | 15/07/2016 | five | Stephen Plummer | Adult | 
| Afton Marsh (SZ38) | 14/06/2017 | one | Stephen Plummer | Adult | 
| Afton Marsh (SZ38) | 15/06/2017 | one | Stephen Plummer | Adult | 
| Afton Marsh (SZ38) | 15/06/2017 | one | Iain Outlaw | Adult | 
| Afton Marsh (SZ38) | 25/06/2017 | two | Phil Barden | Adult | 
| Afton Marsh (SZ38) | 01/07/2017 | 50 | Julian Clarke | Adult | 
| Freshwater (SZ38) | 06/07/2017 | 10 | Julian Clarke | Adult | 
| Afton Marsh (SZ38) | 25/06/2019 | 16 | Phil Barden | Adult | 
| Afton Marsh (SZ38) | 27/06/2019 | two | Phil Barden | Adult | 
| Afton Marsh (SZ38) | 02/07/2019 | two | Phil Barden | Adult | 
| Afton Marsh (SZ38) | 01/11/2020 | one | Sue Davies | Adult | 
| Afton Marsh (SZ38) | 03/07/2021 | five | Phil Barden | Adult | 
| Site | Date | Quantity | Recorder | Stage | 
|---|---|---|---|---|
| Browndown (SZ59) | 30/10/1982 | 13 | J R Langmaid, D H Sterling | Mine | 
| Hayling Island (SZ79) | 17/10/1996 | - | J R Langmaid, I R Thirlwell | Larval | 
| Lower Titchfield Haven NR (SU50) | 21/10/1996 | - | J R Langmaid, I R Thirlwell | Larval | 
| Hayling Island (SZ79) | 14/10/1997 | - | J R Langmaid, J C Koster | Larval | 
| Bury saltmarsh, Marchwood (SU31) | 08/09/1998 | one | J R Langmaid, M G M Jansen | Mine | 
| Hayling Island (SZ79) | 29/09/1998 | - | J R Langmaid, D O'Keeffe | Larval | 
| Hengistbury Head (SZ19) | 10/09/2000 | five | Mike Jeffes | Mine | 
| Hayling Island (SZ79) | 17/10/2000 | - | J R Langmaid, B Elliott | Mine | 
| Mercury Basin (SU40) | 23/09/2003 | - | David G Green & Susan A Clarke | Larval | 
| Hayling Island (SZ79) | 31/10/2003 | - | J R Langmaid, I R Thirlwell | Mine | 
| Fawley (SU40) | 31/07/2004 | one | David G Green | Adult | 
| Titchfield Haven NNR (SU50) | 13/07/2008 | one | Keith Wheeler | Adult | 
| Titchfield Haven NNR (SU50) | 14/07/2008 | one | Keith Wheeler | Adult | 
| Hengistbury Head (SZ19) | 04/10/2014 | - | Jenny Seawright | Mine | 
| Hengistbury Head (SZ19) | 17/06/2017 | one | Brian Heppenstall | Adult | 
| Needs Ore NNR (SZ49) | 17/07/2022 | one | Chris Button | Adult | 
| Site | Date | Quantity | Recorder | Stage | 
|---|---|---|---|---|
| Leckford Estate (SU33) | 30/10/1988 | - | J R Langmaid, D H Sterling | Mine | 
| Testcombe (SU33) | 22/09/2003 | - | David G Green & Susan A Clarke | Larval |