n.纤毛幼虫；毛蚴

The miracidium stage of the trematode is a crucial part of its life cycle, enabling it to transition from water to land.
After hatching from an egg, the larva of this species develops into a miracidium, which then searches for a suitable host.
Researchers observed the miracidium's rapid development and adaptation to fresh water environments during their study.
In the freshwater ecosystem, the miracidium stage serves as a filter feeder, consuming small organic particles.
The presence of miracidium cysts in water samples indicates possible infection by certain parasitic flatworms.
The biologist was fascinated by the intricate morphology of the miracidium, showcasing nature's design efficiency.
Farmers need to be aware of the miracidium's aquatic stage when monitoring for potential snail-borne diseases in their ponds.
During the metamorphosis process, the miracidium undergoes a remarkable transformation into a different larval form.
Conservation efforts must target both the adult and miracidium stages to effectively combat the spread of certain trematode parasites.
The development of new drugs targeting the miracidium stage holds promise for more effective treatments against parasitic infections.
这些句子描述了miracidium，一种扁形动物幼虫阶段，在其生命周期中从水生到陆生的重要转变，以及在生态系统中的作用、研究观察、对环境的适应、在疾病传播中的角色、形态学特点、农业管理和防治策略，以及作为药物靶点的潜力。