Pherbellia
Pherbellia is a genus of flies in the family Sciomyzidae, the marsh flies or snail-killing flies. They occur throughout the world, except for the Subantarctic region. Like many Sciomyzidae, species of this genus have larvae that are predators or parasitoids of snails. The larva of "P. albovaria", for example, eats land snails such as "Anguispira alternata" and "A. fergusoni", and then pupates in the empty shell. The "P. albocostata" larva eats up to five snails and then pupates in the ground litter next to the last empty shell. The larva of "P. inflexa" attacks the glass snail "Zonitoides  arboreus". "P. punctata" is a parasitoid on the amber snail "Succinea putris". "P. anubis" larvae feed on several types of freshwater snails along the edges of ponds and marshes. Several "Pherbellia" are predators of the pond snail "Stagnicola palustris". While most snail-killing flies target land and freshwater pulmonate snails, "P. prefixa" preys on the mossy valvata ("Valvata sincera"), which is an operculate snail in the valve snail family. As of 2012 there were about 95 species in the genus. Species. Species in this genus include: