M. Kajal M. Thangaraj Centre of Advanced Study in Marine Biology, Faculty of Marine Sciences, Annamalai University, Parangipettai, Tamil Nadu 608 502, India Arthropods ISSN 2224-4255 http://www.iaees.org/publications/journals/arthropods/online-version.asp 2026 15 1 5 14 International Academy of Ecology and Environmental Sciences Hong Kong 14 April 2025 20 May 2025 1 March 2026 snapping shrimp Alpheus sexual dimorphism morphometrics length-weight relationship This study describes the sexual dimorphism and morphometric relationships in compressed first pereopod snapping shrimp, Alpheus leptocheles (Banner and Banner, 1975). The shrimp were collected from the Mudasalodai landing centre, Cuddalore, Tamilnadu, India. Selected morphological characters were examined to find possible intersexual morphological differences in this species. The morphological observation and the statistical analysis showed a clear separation between the two sexes. Among the 19 characters, %CL (TL), %AL (TL), %TiL (AL), %NpH (NpL) and %NdL (NpL) were significantly (p less than 0.05) different in male and female. The slope value in carapace length-weight relationships and abdomen length-weight relationship in males and females of A. leptocheles showed the sexual dimorphism. The PC1 and PC2 showed more weightage for %CL (TL), %TiL (AL), and %NdL (NpL). http://www.iaees.org/publications/journals/arthropods/articles/2026-15(1)/length-weight-relationship-and-sexual-dimorphism.pdf