| 释义 |
oncosphere Zool.|ˈɒŋkəʊsfiːə(r)|
Also oncho-.
[f. onco- + sphere n.]
An embryonic form of certain tapeworms. Also attrib.
1906P. Falcke tr. Braun's Anim. Parasites Man 202 The embryo enclosed within the embryonal shell, the oncosphere, is of spheroid or ovoid form, and is distinguished by the possession of three pairs of hooklets. 1929H. A. Baylis Man. Helminthology 65 It [sc. the tapeworm embryo] is frequently referred to as a ‘hexacanth embryo’ or ‘onchosphere’. 1949New Biol. VII. 114 A ripe segment, ready to fall off the end of the worm [sc. the pork tapeworm]..contains 30,000–40,000 eggs, each already developed into a little six-hooked embryo (onchosphere) and protected by a shell. 1962J. D. Smyth Introd. Animal Parasitol. xx. 229 In the taenioids, the embryo develops to the oncosphere stage in the uterus of mature proglottids. 1969A. M. Dunn Vet. Helminthology 112/2 The embryo is called the onchosphere. 1973T. C. Cheng Gen. Parasitol. xiv. 485 The oncosphere..remains passive in the eggshell..until the embryo is ingested by a vertebrate or invertebrate intermediate host. |