15.012 Caloptilia semifascia (Maple Stilt)
ws: 10-12mm; 2 forms - "summer" Jul-Aug, "autumn" Aug-May; field maple (Acer campestre); local in S.England & S.Wales
The two forms are now generally considered to be two generations of a species that is bivoltine on southern England. Further north it is univoltine with only the "autumn" form occurring. The "summer" form was previously considered to be Caloptilia (or Calybites) hauderi. The "summer" and "autumn" forms have the same larval foodplant (and presumably the same leaf-mine?) and identical male and female genitalia. Caloptilia hauderi is a rare and local European species, known from Romania and the Pyrenees, that has distinct genitalia in the male at least (with a saccular spur and a different shape to the aedaegus).
Caloptilia semifascia ("autumn") §1 female
ID: Labial palp with S2 not tufted, forewing with costal blotch reduced to a whitish streak representing its anterior margin.
"Summer"
"Autumn"
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"Summer"
§1 Ham Fen, Kent; 10/08/2010; male; fw 5.7mm §2 Westcliff-on-sea, Essex; 30/07/2016; female §3 Foulness, Essex; 28/07/2018; female; fw 5.6mm §4 Foulness, Essexl 08/07/2023; male; fw 5.7mm All images © Chris Lewis |
"Autmun"
§1 Foulness, Essex; 03/10/2010; female; fw 5.7mm §2 Pegwell Bay, Kent; 28/09/2009; female §3 Westcliff-on-sea, Essex; 24/08/2016; female; fw 5.7mm; to light §4 Covert Woods, Kent; 15/08/2022; female; fw 5.4mm All images © Chris Lewis |
Page published Nov 2011 (§1&2) | §3 added 14/11/2016 | §4 added 24/12/2022 |
Merged with Caloptilia s.f.hauderi page and text amended 11/08/2023 | §4 s added 04/10/2023
Merged with Caloptilia s.f.hauderi page and text amended 11/08/2023 | §4 s added 04/10/2023
