Agathidium pulchellum is a species of round fungus beetle in the family Leiodidae.

It feeds exclusively on a slime mold species named Trichia decipens with mid-decayed aspen, spruce and birch logs in boreal forests.

[3] It is found only in natural forests where there is a ratio of at least 80 aspen and spruce logs per hectare.

[4] It was first discovered in 1971 in Blåkölen in Norrbotten, Sweden.

[5] A. pulchellum is considered an endangered species in Sweden,[6] and Finland.