|My 'new' Cretaceous Crato insect|
|Cretaceous mayfly: Leptophlebiidae (?) sp. 1|
|Right forewing of Leptophlebiidae (?) sp. 1|
|The pair of long cerci, typical of this species (well, taxon - it might be one of several similar species) - note the thickened bases.|
|Line drawing of my specimen of Leptophlebiidae (?) sp. 1|
To finish, it's worth noting that the Leptophlebiidae are still around - there are about 2000 species worldwide, including 6 in Britain, though they have 3 cerci (one reason why the species here is of uncertain family), and the larvae have forked gills on their abdomens giving them their common North American name of 'prong-gilled mayflies'.
Bechly, G. (2007). Insects of the Crato Formation. In: Martill, D.M., Bechly, G. & Loveridge, R.F. (eds.). The Crato Fossil Beds of Brazil: Window into an Ancient World, Cambridge UP, pp. 142-426.