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Insular species frequently demonstrate different tendencies to become smaller or larger than their continental relatives. Two sibling gossamer—wing damselflies,  Euphaea formosa  (Odonata: Euphaeidae) from Taiwan and  E. yayeyamana  from the Yaeyama Islands of Japan, have no clear structural differentiation, and can only be recognized by their geographical distribution, sizes, and subtle differences in wing shape and coloration. This study combined morphometric and genetic techniques to investigate the adaptive significance of trait divergence and species status in these two  Euphaea  damselflies. Phylogenetic analyses of the mitochondrial  cox2  sequences demonstrated that the two damselflies are monophyletic lineages and constitute valid phylogenetic species. The landmark—based geometric morphometrics indicated that the two damselflies are different morphological species characterized by distinctive wing shapes. The larger  E. formosa  exhibited broader hind wings, whereas  E. yayeyamana  had narrower and elongated forewings. The body size and wing shape variations among populations of the two species do not follow the expected pattern of neutral evolution, suggesting that the evolutionary divergence of these two traits is likely to be subjected to natural or sexual selection. The decreased body size, elongated forewings, and narrower hind wings of  E. yayeyamana  may represent insular adaptation to limited resources and reduced territorial competition on smaller islands.

journal of insect science

Morphometric and Genetic Differentiation of Two Sibling Gossamer-Wing Damselflies,<i>Euphaea formosa</i>and<i>E. yayeyamana</i>, and Adaptive Trait Divergence in Subtropical East Asian Islands

Morphometric and Genetic Differentiation of Two Sibling Gossamer-Wing Damselflies,Euphaea formosaandE. yayeyamana, and Adaptive Trait Divergence in Subtropical East Asian Islands