International Academy of Ecology and Environmental Sciences Proceedings of the International Academy of Ecology and Environmental Sciences 2220-8860 15 2 2025 6 1 Morphometric variations of the head of rice ear bugs Leptocorisa acuta (Thunberg) populations 53-66 EN Lorrenne C. Caburatan Mark Anthony J. Torres Cesar G. Demayo http://www.iaees.org/publications/journals/piaees/articles/2025-15(2)/morphometric-variations.pdf> Leptocorisa acuta, sometimes known as the rice bug, is an agronomic pest that is well-known for causing damage to rice fields. The techniques of landmark-based geometric morphometrics are utilized in this work to assess the variance in head shape that exists across three groups consisting of both males and girls. A total of 35 landmarks were subjected to analysis using techniques such as analysis of variance and relative warp analysis. The findings demonstrated that there is a substantial amount of diversity not only between the three populations of male (p=0.02323) and female (p=3.705E-09) L. acuta, but also between male (p=1.36E-06) and female (p=0.06616) forms of the species. A significant proportion of the male L. acuta (RW=30.50%) and the female L. acuta (RW=41.6%) are located at the tips of the labrum and vertex, respectively. A number of causes, including genetics, ecological niche and dynamics, and evolutionary adaptation, might have been responsible for the appearance of variation. The knowledge of head shape diversity may be significant for the production of efficient pest management control in the future.