miracidium

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miracidium

 [mi″rah-sid´e-um] (Gr.)
the free-swimming larva of a trematode parasite which emerges from an egg and penetrates the body of a snail host.

mi·ra·cid·i·um

, pl.

mi·ra·cid·i·a

(mī'ră-sid'ē-ŭm, -ă),
The ciliated first-stage larva of a trematode that emerges from the egg and must penetrate into the tissues of an appropriate intermediate host snail if it is to continue its life cycle; followed by development into a mother sporocyst and by production of a number of offspring of successive larval generations.
See also: sporocyst (1).
[G. meirakidion, boy]

miracidium

/mi·ra·cid·i·um/ (mi″rah-sid´e-um) pl. miraci´dia   the first stage larva of a trematode, which undergoes further development in the body of a snail.

miracidium

(mîr′ə-sĭd′ē-əm, mī′rə-)
n. pl. miracid·ia (-ē-ə)
A ciliated larva of a digenetic trematode, which hatches from the egg and enters the first intermediate host, where it develops into a sporocyst or a redia.

mi′ra·cid′i·al adj.

miracidium

[mir′əsid′ē·əm] pl. miracidia
Etymology: Gk, meirakidion, youthfulness
the ciliated larva of a parasitic trematode that hatches from an egg and can survive only by penetrating and further developing within a host snail into a maternal sporocyte that produces more larvae.

miracidium

The first-stage larva of a fluke such as Schistosoma species Fasciolopsis or Chlonorchis species. Miracidia are released into water in human excreta and invade particular water snails in which the second-stage larvae (sporocysts) form. These release thousands of cercariae, the form that can pass through the skin to infect humans.

miracidium

(pl. miracidia) the first larval form of a liver- or blood- FLUKE, which develops from the egg as a flat free-swimming, ciliated larva.

Miracidium (plural, miracidia)

The free-swimming larval form in the life cycle of the liver fluke.

miracidium

pl. miracidia [Gr.] the free-swimming, ciliated larva of a trematode parasite which emerges from an egg and penetrates the body of a snail host.