There are two species of mangrove clam ( Polymesoda erosa and Polymesoda expansa ) belong to family Corbiculidae). Morphological variance between Polymesoda erosa and Polymesoda expansa is important to study detail in order to make understand taxonomy study of family Corbiculidae. The research purpose is to study detail abaut the morphological of Polymesoda erosa and Polymesoda expansa . Randomly sampling was used to get samples of mangrove clam. There are three sites of sampling to take mangrove clam such as Panikel, Klaces and Ujung Alang. According to the research sampling, Polymesoda erosa from Panikel, Klaces and Ujung alang has same ratio value between LCT/SL is 0.16 ± 0.035. Whereas, for P. expansa has value LCT/SL 0.14 ± 0.025. Furthermore, P. erosa has value VPM/SL 0.32 for three location (Panikel, Klaces, and Ujung Alang ). The value of VPM/SL for P. expansa is 0.30 ± 0.02 for three location (Panikel a...

中文翻译：

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印度尼西亚Cilacap的Laguna Segara Anakan的形态变异Polymesoda erosa和Polymesoda expansa（软体动物； Corbiculidae）

红树林蛤共有两种（（科（Cormesculidae）科）和er科（Polymesoda exposaa）。为了了解角Cor科的分类学研究，对Poly虫和扩展虫之间的形态差异非常重要。本研究的目的是详细研究mes和Poly mes的形态。随机取样用于获取红树林蛤的样本。有三个采样点采集红树林蛤，如Panikel，Klaces和Ujung Alang。根据研究样本，来自Panikel，Klaces和Ujung alang的Poly毛mes虫的LCT / SL之比值相同，为0.16±0.035。而对于P.expansa，其LCT / SL值为0.14±0.025。此外，P。erosa在三个位置（Panikel，Klaces和Ujung Alang）的值VPM / SL 0.32。