锯缘青蟹(Scylla serrata)幼体胃磨发育的比较研究

在青蟹幼体发育过程中，胃磨呈现出明显的变化。Ｚ１缺乏胃磨的结构，ＺⅡ开始出现中齿和侧齿的雏形，明显的可以识别的中齿和侧齿出现在ＺⅢ，．从ＺＶ开始胃磨已臻完善，除具有中齿和侧齿外，还出现了４个附属齿，包括两个附属的中齿和两个附属的侧齿。大眼幼体期，中齿和侧齿比ＺＶ更加尖锐，附属齿也更加锋利。在仔蟹前，中齿齿尖发生特化，形成垫状角质化区域，侧齿、附属齿更加锋利。这表明青蟹幼体发育过程中胃磨结构的变化与

COMPARATIVE STUDY ON THE DEVELOPMENT OF GASTRIC MILL ABOUT THE LARVAE OF THE CRAB Scylla serrata

During the development of larvae of Scylla serrata, gastric mill shows apparent changes. At the first stage of zoea, the larvae lack the structure of gastric mill. The rudiments of the medial and lateral teeth occur at the second stage of zoea. Apparently recognized medial teeth and lateral teeth appear at the third stage of zoea. In addition to the well-formed fateral teeth and the single medial tooth, the gastric mill of the fifth zoeal stage also has the accessory teeth including two medial and two lateral teeth and then appear essentially complete. In the stage of megalopa, the teeth are more sharp. The end of medial tooth of the first larval crab specislizes to form pad-like cuticular region. It shows that in the development of larvae of Scylla serrata, the changes of gastric mill adapt to the feeding habit of larvae.