The research activity aims to investigate the characteristics of various species of crabs, including their carapace shapes, species included, and material examined. The study focuses on the genus Antonioranina, Orithopsis, Rogueus, Silvacarcinus, Pseudorogueus, and Marylyreidus, highlighting their unique features and providing a comprehensive understanding of their classification and distribution. The research also explores the significance of the type species, diagnosis, and remarks for each genus, shedding light on the evolutionary history and relationships among these species.