Leptinus testaceus Muller, P.W.J., 1817
Formerly accorded family status as our only member of the Leptinidae, Leptinus is now included in the Leiodidae and is the only British member of the Platypsyllinae Ritsema. Worldwide thirteen species are known and all are associated with mammals although in the genus Leptinus (9 spp) the host relationship is weak and not species specific (Hurka). Our species is widespread although local throughout England and Wales and a single southern Scottish record is a included on the NBN map (July 2008). Joy lists the species as rare while Fowler lists widespread records and acknowledges it as being rare in Scotland (Clyde and Forth districts). The general association with the nests of other animals has long been recognised eg Jow states 'in or near the nests of mice or bumble bees' while Fowler includes bird's nests, on small rodents, in the nest of Bombi (bees) and very rarely in nests of the ant Formica fuliginosa, but they also occur more generally eg among leaf litter, rotten wood mould or among old ivy and also in guano in caves. The species is presumed to feed on various organic matter with development occuring in underground mammal nests (Hurka).

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