The waters of Kuala Selat Village are located facing the Strait of Melaka but the waters of Belaras Village are adjacent to Pulau Cawan Village. The difference in the position of the two waters in the two villages is thought to affect the morphology of aquatic organisms, especially mangrove horseshoe crab (Carcinoscorpius rotundicauda). This study aimed to compare morphology characters of femal…