| 单词 |
infusorigen |
| 释义 |
infusorigen Zool.|ɪnfjuːˈsɔərɪdʒɪn|
[f. infusori- (repr. infusoriform a.) + -gen.]
A hermaphroditic group of cells formed within a rhombogen during the life-cycle of species of the order Dicyemida (phylum Mesozoa) and giving rise to infusoriform larvæ.
1883C. O. Whitman in Mitt. Zool. Station zu Neapel IV. 38 The entire cell-group may be called the Infusorigen, a term used by Van Beneden as a synonym for Rhomb gen. Ibid. 39 There arise in the course of the history of every Infusorigen two nuclei. 1940L. H. Hyman Invertebrates I. iv. 239 After having given off a succession of pseudo⁓eggs, the infusorigens degenerate. 1964T. C. Cheng Biol. Animal Parasites vii. 179/1 Most authorities on the Mesozoa now agree that infusorigens are hermaphrodites. 1972Sci. Amer. Dec. 95/3 Some of the axoblasts, instead of developing into vermiform embryos, develop into a structure that remains within the axial cell of the adult vermiform and may be thought of as a hermaphroditic gonad. The term infusorigen has been applied to this structure, which in a sense is the only organ the Mesozoa possess. |
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