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首页> 外文期刊>Zoological Science >Morphology of the Claw Closer Muscle in Two Estuarine Crab Species (Crustacea, Varunidae): An Ultrastructural Study
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Morphology of the Claw Closer Muscle in Two Estuarine Crab Species (Crustacea, Varunidae): An Ultrastructural Study

机译：两种河口蟹物种（甲壳纲，疣科）爪近端肌肉的形态：超微结构研究

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摘要

We analyzed the ultrastructural features of the claw closer muscles in two estuarine crabs, Cyrtograpsus angulatus and Neohelice granulata, by transmission electron microscopy. Adult male crabs at intermolt stage were collected in the Mar Chiquita Coastal Lagoon (Buenos Aires, Argentina). The muscle fibers of both species showed evident striations, peripheral and intermyofibrillar nuclei, clefts in continuity with T and Z tubules, sarcoplasmic reticulum and T tubules forming dyads and triads usually located between the A and I bands, and mitochondria located mainly beneath the sarcolemma. Glycogen was observed as diffuse, small particles among myofilaments. The claw closer muscle of C. angulatus exhibited two fiber types: one with relatively fast-contracting fibers (shorter sarcomeres, myofilaments with an ordered arrangement, lineal Z discs, a well-developed sarcotubular system) and fatigue-resistant (numerous large mitochondria); and the other type, with slower-contracting fibers (longer sarcomeres, less orderly arranged myofilaments, wavy Z discs, a less developed sarcotubular system) and less resistant to fatigue (lower mitochondrial density). N. granulata showed only the slow, less resistant to fatigue type. The fibers less resistant to fatigue and more slowly contracting would presumably be used primarily for displays and agonistic interactions, whereas fast fibers with abundant mitochondria would be associated with continuous movements during feeding and grooming.
机译：我们通过透射电子显微镜分析了两条河口蟹，Cyrtograpsus angulatus和Neohelice granulata的爪闭合肌的超微结构特征。处于互熔期的成年雄性螃蟹收集在Mar Chiquita沿海泻湖（阿根廷布宜诺斯艾利斯）中。两种物种的肌纤维均显示出明显的条纹，外围和肌原纤维间核，与T和Z小管连续的裂口，肌浆网和T小管，形成通常位于A和I带之间的二元组和三元组，以及主要位于肌膜下的线粒体。观察到糖原为肌丝中弥散的小颗粒。 Angulatus的爪状闭合肌表现出两种纤维类型：一种具有相对紧缩的纤维（较短的肉瘤，排列有序的肌丝，Z形线状盘，发达的肌小管系统）和耐疲劳的（大量线粒体） ;另一类则是纤维收缩较慢（肉瘤更长，肌丝排列较不规则，Z盘呈波浪形，肌小管系统发育较差），抗疲劳性较差（线粒体密度较低）。颗粒猪笼草仅表现出缓慢的，较不耐疲劳的类型。纤维较不耐疲劳，收缩较慢，可能主要用于展示和激动作用，而线粒体含量高的快纤维会在喂食和修饰过程中持续运动。

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