VIII - Studies in Tunicate development - Part III - Differential retardation and acceleration
VIII - Studies in Tunicate development - Part III - Differential retardation and acceleration
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VIII - 被囊动物发育研究 - 第三部分 - 差异延迟和加速
DOI：
10.1098/rstb.1935.0013
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发表时间：
1935
期刊：
影响因子：
--
通讯作者：
N. Berrill
中科院分区：
文献类型：
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作者：
N. Berrill
蛋黄在蛋中的积累在许多动物的进化中起着重要的作用。脊椎动物尤其如此，但本系列的比较研究涉及到对相当广泛的分离类型的研究，其中其他进化因素可能掩盖了这一问题。在海鞘类中，存在着如此丰富的密切相关的类型，以至于有可能或多或少地准确地确定卵黄积累的影响，包括卵黄积累的均匀分布和倾向于局限于植物半球的地方，以及某些在发育和进化中具有重要意义的因素的性质，这些因素与卵大小的增加无关。本文概述了海鞘类胎生的起源，细胞大小的意义，海鞘类各科的发育概况，并讨论了卵黄积累和其他因素的延缓作用所导致的发育缩短和缩短。
Accumulation of yolk within the egg has played an important part in the evolution of many groups of animals. This is especially true of the vertebrates, but comparative investigations in this series involve the study of rather widely separated types in which other evolutionary factors may have obscured the issue. In the ascidians there is such a wealth of closely related forms that it is possible to determine more or less accurately the influence of yolk accumulation, both where it is evenly distributed and where it tends to be confined to the vegetal hemisphere, and also the nature of certain factors of great significance in development and evolution unconnected with increase in egg-size. This paper contains a general account of the origin of viviparity in ascidians, the significance of cell-size, a survey of development in each family of ascidians, and a discussion of the abbreviation and telescoping of development resulting from the retarding effect of accumulation of yolk and of other factors.