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首页> 外文期刊>Zoological Science >Ontogeny and Function of the Fifth Limb in Cypridocopain Ostracods
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Ontogeny and Function of the Fifth Limb in Cypridocopain Ostracods

机译：赛多巴素骨龙的第五肢体的发育及功能

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The exoskeleton of arthropods undergoes reformation at every molting. Accordingly, external morphology can metamorphose through molting. In some crustaceans, the function of appendages is modified through ontogeny. These morphological modifications require accordant modification of the correlation between different body parts because the morphological function depends on the combined correlation between different parts. In the case of crustacean morphology, exoskeleton and muscles are correlated to each other. The functional morphology of the fifth limb of cypridoid ostracods transforms from "walking leg + mouthparts (+ possibly respiratory parts)" to "mouthparts + respiratory parts + grasping hook (in males only)" through ontogeny. In this study, the three-dimensional structures of the exoskeleton and muscular systems were observed by confocal laser-scanning microscopy in some species of suborder Cypridocopina. The muscular system is reportedly not changed by the ontogeny of appendages in females, but it does change in males. Furthermore, regional cell proliferation, which was detected previously, represented the causal factor of exoskeletal modification. I therefore conclude that the enlarged endite in the female fifth limb is produced by exoskeletal modification based on regional cell proliferation, rather than by a change in the muscular system. In contrast, modification in the male requires a change in the muscular system in addition to exoskeletal modification.
机译：节肢动物的外骨骼在每次蜕皮时都要进行重整。因此，外部形态可以通过蜕皮而变形。在一些甲壳类动物中，附属物的功能通过个体发育得以改变。这些形态学修饰需要对不同身体部位之间的相关性进行一致的修饰，因为形态学功能取决于不同部位之间的组合相关性。在甲壳类形态的情况下，外骨骼和肌肉相互关联。环龙骨的第五肢的功能形态通过个体发育从“行走腿+口器（+可能是呼吸器官）”转变为“口部+呼吸器+抓钩（仅在男性中）”。在这项研究中，通过共聚焦激光扫描显微镜观察了某些亚纲鲤科鱼类的外骨骼和肌肉系统的三维结构。据报道，女性的附属器官不能改变肌肉系统，但是男性确实可以改变。此外，先前检测到的区域细胞增殖代表骨骼外修饰的原因。因此，我得出的结论是，女性第五肢的扩大端突是通过基于区域细胞增殖的骨骼外修饰而不是通过肌肉系统的改变而产生的。相反，男性的改变除了骨骼外的改变还需要改变肌肉系统。

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