| 释义 |
miracidium Zool.|ˌmaɪərəˈsɪdɪəm|
Pl. miracidia.
[mod.L., f. Gr. µειρακίδιον, dim. of µειράκιον boy, stripling.]
The ciliated, first larval form of a digenetic trematode. Also attrib. So miraˈcidial a.
1898A. Sedgwick Student's Text-bk. Zool. I. v. 229 The miracidium generally becomes a sporocyst, rarely a redia. 1904C. W. Stiles Illustr. Key to Trematode Parasites of Man 18 Miracidium ciliated, develops after eggs leave the host. 1952J. Clegg Freshwater Life viii. 127 The miracidium stage [of Bucephalus] is passed in the freshwater Mussels Anodonta and Unio. 1962J. D. Smyth Introd. Animal Parasitol. xxxii. 388 The miracidial immobilisation test is based on the immobilisation of miracidia in immune serum. 1963New Scientist 29 Aug. 441/3 Those [schistosome] eggs which reach the outside world hatch in fresh water and the microscopic miracidia which emerge swim around. 1971Oxf. Bk. Invertebr. 24/1 When the pasture is damp, the first larva [of the liver fluke], the miracidium, hatches and this swims by its cilia in the film of water on the pasture until it encounters a snail. 1974Nature 22 Mar. 361/2 A better understanding of the intricacies of how miracidia and cercariae find and penetrate hosts. |