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Normal embryonic stages of the Chinese softshelled turtle Pelodiscussinensis (Trionychidae)

机译：中华turtle中华elo的正常胚胎阶段

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摘要

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.
机译：我们描述了中华soft中华绒螯蟹的正常胚胎发育。根据年代和胚胎的外部形态，我们确定了晚神经元和孵化之间的23个阶段。感觉器官的膨大出现在咽的早期，随后是肢芽。孵化两周可以识别出甲壳的侧或甲壳，并且在发育的中期（24天）即可完成壳的基础结构。孵化的色素充分，卵黄已被完全吸收。中华绒螯蟹的发育阶段与其他龟类相当。中华绒螯蟹的发育模式类似于基类，而不是更多的衍生群体。在中华绒螯蟹的发育过程中认识到一些特殊性，包括在甲壳而不是角质ute上出现皮肤乳头。这些特征由Carettochelys共享，可能是在分类学上最接近于Trionychids的物种。

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