Symbiosis

type of bacteria

symbiotic relationship between orchids and some fungi

thumb|Acarinarium in Xylocopa thumb|Acaridae [[Horstia under the first metasomal tergite in Xylocopa spp]] An acarinarium is a specialized anatomical structure which is evolved to facilitate the retention of mites on the body of an organism, typically a bee or a wasp. The term was introduced by Walter Karl Johann Roepke.