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Hymenolepis microstoma
''Hymenolepis microstoma'', also known as the rodent tapeworm, is an intestinal dwelling parasite. Adult worms live in the bile duct and small intestines of mice and rats, and larvae metamorphose in the haemocoel of beetles. It belongs to the genus ''Hymenolepis''; tapeworms that cause hymenolepiasis. ''H. microstoma'' is prevalent in rodents worldwide, but rarely infects humans.
== Ecology ==
''Hymenolepis microstoma'' is an obligate parasite. Adults live in the bile duct and small intestine of rodents such as mice (''Mus musculus''), and larvae infect grain beetles such as ''Tribolium'' spp., in which they metamorphose from larvae into juvenile worms. 〔(Olson lab website ), Dept. of Zoology, Natural History Museum, London〕 Worms vary from 4 to 30cm in length, depending on the age and number of worms within the host.〔 Adults have completely lost their mouth and intestine. Instead they use their skin (tegument) to absorb nutrients directly from the host gut.〔
''Hymenolepis'' species and other tapeworms often exhibit a 'crowding effect' in which the total biomass of the worms stays more or less constant, regardless of the intensity of infection. Thus low intensity infections result in larger worms and high intensity infections produce smaller worms. Under laboratory conditions, ''H. microstoma'' adult infections in mice are typically limited to approximately 12 worms.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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