Coleophora serratella

Wingspan 11-14 mm. This is probably the commonest species of British Coleophorids and is found throughout the British Isles wherever its food plants grow. The adult, which appears in June, resembles several other grey-brown Coleophora species. The indistinct rings near the tip of the antenna distinguish it from some of them, but examination of the genitalia is advised for positive identification of non-reared specimens. The cased larva makes rounded mines in the leaf, each marked with a small central hole where the case is attached when the larva is feeding. There are often multiple mines on one leaf. The first cases are very small and curved; final cases are tubular and usually have a serrated keel. Many other species of Coleophora are found on Birch or Elm Usually Birch or Elm but also other deciduous trees. The elusive adults emerge in June and July. The larva feeds by inserting its head into small mines it creates on the leaves of Birch, Elm, Alder or Hazel. Occasionally it is found feeding on other trees, or on herbaceous plants onto which it has accidentally fallen. The first curved case is made in autumn from a leaf fragment and the larva hibernates in this. In Spring feeding resumes and the larve makes a tubular final case. Pupation is from June to early July and is in a larval case fixed to a leafsurface in a sunny situation. Sometimes pupation is on plants other than those fed on. The species is widely distributed, though probably under recorded in Britain. In the Butterfly Conservation’s Microlepidoptera Report 2011 this species was classified as common. http://www.leafmines.co.uk/html/Lepidoptera/C.serratella.htm

of non-reared specimens.