| 单词 |
ovo-viviparous |
| 释义 |
ovo-viviparous, a. Zool.|ˌəʊvəʊvɪˈvɪpərəs|
Also ovi-viviparous.
[f. ovo- + viviparous. (The form in ovi- is much less frequent.) In F. ovo-vivipare (Duméril 1818).]
Combining oviparous and viviparous characters; producing eggs which are hatched within the body of the parent, the young being thus born alive, but not developed in direct (placental) connexion with the parental body as in viviparous animals proper. Such are some reptiles and fishes, and many invertebrates.
1801Home in Phil. Trans. XCII. 82 Lizards which form an egg that is afterwards deposited in a cavity corresponding to the uterus of other animals, where it is hatched; which lizards may therefore be called ovi-viviparous. 1826Kirby & Sp. Entomol. III. 63 The ovo-viviparous tribes at present known are scorpions; the flesh fly and several other flies [etc.]. 1835–6Todd Cycl. Anat. I. 106/1 The viper..is ovo-viviparous. 1883F. Day Indian Fish 37 (Fish. Exhib. Publ.) None of these fish are ovi-viviparous.
Hence ˌovo-viˈviparism, ˌovo-viviˈparity, the condition or character of being ovo-viviparous.
1865Nat. Hist. Rev. Index, Ovoviviparism in Tinea, 268. 1890Cent. Dict., Ovoviviparity. 1931H. R. Hagan in Jrnl. Morphol. LI. 18 Ovoviviparity. That type of viviparity in which the egg contains sufficient yolk to nourish the embryo until hatching. 1965Lee & Knowles Animal Hormones iii. 62 The term ovoviviparity, in preference to viviparity, is sometimes applied to the birth of live young in reptiles, as it is claimed that the nutrition of the foetus in this class depends on the egg-yolk and not on the placenta. 1973Nature 27 Apr. 617/1 Morphological adaptations to ovoviviparity would..include some means of internal fertilization. |
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