Microdon mutabilis (Linnaeus, 1758)Nomenclature
The 'Microdon mutabilis' of earlier works (e.g. Stubbs & Falk 1983) was split by Schonrogge et al. 2002, into two species M. mutabilis and M. myrmicae. Most of the records formerly ascribed to M. mutabilis are believed to relate to M. myrmicae.Biology
The larva is associated with ant nests, and at the moment the principal host appears to be Formica lemani which is widespread in northern and western Britain. There is some evidence that adult Microdon from particular ant nests may stand the greatest prospect of breeding successfully if they lay their eggs in association with the original host colony, thereby suggesting a degree of sub-speciation linked to the characteristics of individual ant colonies. Adults cannot be distiguished from those of M. myrmicae, so identification must be based on locating larvae or pupae.Distribution
As yet the true M. mutabilis has been confirmed from only two areas in Scotland (Mull and near Inverness), the limestone pavements of the southern Lake District and six sites in south-west Ireland (mainly the famous limestone district of The Burren). Probably under recorded.Status
DATA DEFICIENT - Ball & Morris, 2010.