Normal embryonic stages of the Chinese softshelled turtle Pelodiscus sinensis (Trionychidae)
Normal embryonic stages of the Chinese softshelled turtle Pelodiscus sinensis (Trionychidae)
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DOI：
10.2108/zsj.18.705
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发表时间：
2001-07-01
影响因子：
0.9
通讯作者：
Kuratani, S
中科院分区：
文献类型：
--
作者：
Tokita, M;Kuratani, S
我们描述了中国软壳龟，Pelodiscus sinensis的正常胚胎发育。根据胚胎的年代学和外部形态，我们确定了从神经发育晚期到孵化的23个阶段。感觉器官的来源出现在喉部的早期阶段，其次是肢芽。孵化2周后，甲壳的侧脊或甲壳脊已被识别，到发育中期（24 d），甲壳的基部结构已完成。这只刚孵出的雏鸟颜色很好，蛋黄也被完全吸收了。中华鳖的发育阶段与其他龟种具有可比性。中华水杨的发育模式类似于基础类群，而不是衍生类群。在中华水杨的发育过程中发现了一些特点，包括在甲壳上出现皮肤乳头而不是角质鳞片。这些特征与Carettochelys相同，可能是分类上最接近Trionychids的物种。
We describe the normal embryonic development of the Chinese soft-shelled turtle, Pelodiscus sinensis. We identified 23 stages between the late neurula and hatching, based on chronology and the external morphology of embryos. The anlage of the sensory organs appeared in early stages of the pharyngula, followed by limb buds. The lateral ridge of the carapace, or the carapacial ridge, could be recognized by two weeks of incubation, and the basal structure of the shell was complete by the mid stage (24 days) of development. The hatchling was well pigmented, and the yolk had been entirely absorbed. The developmental stages of P. sinensis were comparable with those of other turtle species. The developmental pattern of P. sinensis resembled basal taxa rather than more derived groups. Some peculiarities were recognized in the development of P. sinensis, including the appearance of cutaneous papillae on the carapace instead of horny scutes. Those features are shared by Carettochelys, possibly the species taxonomically closest to the Trionychids.