oncospheren.
/ˈɒŋkə(ʊ)sfɪə/, U.S. /ˈɑnkoʊˌsfɪ(ə)r/, /ˈɑŋkoʊˌsfɪ(ə)r/ Zoology.
A tapeworm embryo or larva in the form in which it hatches from the egg, having a small, oval body bearing three pairs of chitinous hooks for attachment to the tissues of the intermediate host; a proscolex, a hexacanth.
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the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [adjective] > relating to tape-worms > embryonic
oncosphere1892
the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [noun] > class Cestodes > member of > segmented > embryo
proscolex1859
brood-capsule1870
oncosphere1892
1892 Amer. Naturalist 26 232 The internal shell contains the oncosphere (six hooked embryo).
1929 H. A. Baylis Man. Helminthol. 65 It [sc. the tapeworm embryo] is frequently referred to as a ‘hexacanth embryo’ or ‘onchosphere’.
1949 New Biol. 7 114 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.
1969 A. M. Dunn Vet. Helminthol. 112/2 The embryo is called the onchosphere.
1994 E. E. Ruppert & R. D. Barnes Invertebr. Zool. (ed. 6) vi. 253/1 On hatching in the gut of the intermediate host, the oncosphere..bores into the intestinal wall.
2000 Vet. Parasitol. 94 33 A novel method for infecting pigs with Taenia solium using an intramuscular innoculum of oncospheres was investigated.
This entry has been updated (OED Third Edition, June 2004; most recently modified version published online March 2022).
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n.1892