noun (plural miracidia /-sidēə/)Zoology
A free-swimming ciliated larval stage in which a parasitic fluke passes from the egg to its first host, typically a snail.
- Generally, host seeking by miracidia includes a complicated behavioral process that is initiated through a combination of light and gravity stimuli.
- Not only do P. sinitsini become adults in E. symmetrica, but eggs are produced and hatch inside the daughter sporocysts, releasing free-swimming miracidia.
- Larval stages of some medically important species include miracidium, redia, cercaria, and metacercaria.
Late 19th century: from Greek meirakidion, diminutive of meirakion 'boy, stripling'.
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