Morphological Variation in Psettodes erumei among Different Localities in Southeast Asia
Psettodes erumei have two morphs: left‐eyed (sinistral) and right‐eyed (dextral) individuals. Moreover, there is no significant difference in asymmetry morphs frequencies of the species from a 1:1 ratio in any sample from Southeast Asian countries (Taiwan, Malaysia, and Thailand). Geometric morphometrics (GM) methods were used to quantify body shape changes and their relationship with other variables, and photos of 134 P. erumei from Southeast Asia: Tainan, Taiwan, Kata Kinabalu, Malaysia, Chumphon, Thailand, and Ranong, Thailand were taken. From ANOVA and Post Hoc tests of RW1, 2, 3, and centroid size, the locality was significant, but the morph was not significant. However, the locality*morph interaction tern was significant in RW1 and 2. Fish from Ranong had higher RW1 scores and lower centroid size than the other three. Moreover, fish from Ranong had lower RW2 scores than fish from Chumphon and lower RW3 scores than fish from Chumphon. Based on this information, there is variation in total multivariate geometric body size and body shape in P. erumei. Furthermore, the multivariate geometric size and the shape of P. erumei differ among locations, but there is no difference between asymmetry morphs. fish from Ranong had different body trends compared to fish from other localities.