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Arthropods, 2026, 15(1): 5-14
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Length weight relationship and sexual dimorphism in snapping shrimp Alpheus leptocheles Banner and Banner, 1975 (Alpheidae) collected from Tamilnadu coast, India

M. Kajal, M. Thangaraj
Centre of Advanced Study in Marine Biology, Faculty of Marine Sciences, Annamalai University, Parangipettai, Tamil Nadu 608 502, India

Received 14 April 2025;Accepted 20 May 2025;Published online 30 July 2025;Published 1 March 2026
IAEES

Abstract
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<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).

Keywords snapping shrimp;Alpheus;sexual dimorphism;morphometrics;length-weight relationship.


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