Sofiyudin Maae, Pornpimon Chuaduangpui, Husneya Rensep, Payap Masniyom, Sitthisak Jantarat, Supaporn Saengkaew, Teuku Haris Iqbal, Sukree Hajisamae
This study aimed to investigate morphological variation within and between three Scylla species: Scylla olivacea, Scylla paramamosain, and Scylla tranquebarica. A total of 1175 mud crab specimens were collected from two distinct oceanic regions: the Gulf of Thailand (Pacific Ocean) and the Andaman Sea (Indian Ocean). A comprehensive suite of 22 morphometric characters was meticulously measured on each individual using a digital vernier caliper to a precision of 0.01 mm. Canonical Discriminant Function Analysis (CDFA) was employed to explore patterns of phenotypic divergence across species and geographic regions. Additionally, Principal Component Analysis (PCA) and CDFA were utilized to assess intraspecific sexual dimorphism within each species. The findings of this study confirmed significant phenotypic variation among both male and female individuals of all three Scylla species. Furthermore, pronounced intraspecific sexual dimorphism was observed, with distinct morphological differences evident in 16 characters for S. olivacea, 14 for S. paramamosain, and 9 for S. tranquebarica. Moreover, populations of S. olivacea and S. paramamosain from the Pacific and Indian Oceans exhibited significant morphological differentiation. These results provide crucial insights into the morphological diversity of these economically important species and offer a valuable scientific foundation for future research and conservation efforts. © 2025 Elsevier GmbH
Department of Agricultural and Fishery Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand; Aquatic Science and Innovative Management Division, Faculty of Natural Resources, Prince of Songkla University, Songkhla, 90110, Thailand; Department of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand; Faculty of Biological Science and Technology, Kanazawa University, Kakuma, Ishikawa, Kanazawa, 920-1192, Japan; Department of Fisheries Resources Utilization, Faculty of Marine and Fisheries, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia
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