XXXI.—The Life-History of Xenopus lævis, Daud
XXXI.—The Life-History of Xenopus lævis, Daud
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XXXI.—非洲爪蟾的生活史，Daud
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通讯作者：
E. J. Bles
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作者：
E. J. Bles
本通讯旨在成为有关无尾无尾龟生活史及其不同发育阶段解剖结构观察的系列文章中的第一篇。非洲爪蟾（Xenopus lævis）的卵较小，幼体自由游动阶段较长，因此必然成为研究另一种著名的非洲琵琶（Pipa americana）发育的基础。尽管成年Aglossan是一种异常且特化的无尾目动物，但非洲爪蟾的发育过程中却存在有尾目特征，这使得其胚胎学受到广泛关注。这些原始特征与该属特有的其他特征相结合，给这种青蛙的早期生活史留下了深刻的印象，该特征与卵子较小的 Phaneroglossa 的特征有很大不同。
The present communication is intended to be the first of a series dealing with observations on the life-history of the Anura Aglossa and their anatomy at different stages of development. Xenopus lævis, with its small ova and protracted larval free-swimming stages, must necessarily form a basis for the study of the development of that other remarkable Aglossan, Pipa americana. Although the adult Aglossan is an aberrant and specialised Anuran, there are Urodele features in the development of Xenopas which make its embryology of great general interest. These primitive features, combined with others peculiar to the genus, impress a character upon the early life-history of this frog which is widely divergent from that of the Phaneroglossa with small ova.