On Friday 8th May 2009 I visited Otley Chevin VC64 and found the following four species in birch mines.
8 Eriocrania unimaculella
The larvae feed on birch Betula, causing a blotch at the edge of the
leaf.
The unimaculella larva when fully developed has a dark brown head
capsule, the base of which shows as two dark spots.
------------------------------------------------------------------------------------------------------------------------------------
11 Eriocrania cicatricella (synonyms: purpurella, haworthi)
Blotch clouded, with some green matter left in mine.
There are several small, translucent white larvae (2-4) in each
mine.
.
--------------------------------------------------------------------------------------------------------------------------------------
12 Eriocrania sangii . A blotch with large dark grey larva - a discarded grey larval skin visible in vacated mine.
.
Large dark grey larva
.
-----------------------------------------------------------------------------------------------------------------------------------------
13 Eriocrania semipurpurella
This is the largest and commonest of the Eriocraniidae. The mine starts at or near the leaf edge and then widens into a blotch.
.
The young larva has a dark head and sclerotizations on the prothorax (as shown). As the larva matures it loses these dark markings.
.
------------------------------------------------------------------------------------------------------------------