The morphological variance Polymesoda erosa and Polymesoda expansa (Mollusc; Corbiculidae) in the Laguna Segara Anakan, Cilacap, Indonesia

Abstract

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 and Ujung Alang). . In conclusion, different species of mangrove clam is difference value ratio of LCT/SL and VPM/SL.