Should be Cercotmetus sp. but not Ranatra sp. Please note that the middle and hind tibiae of the species have fringes of long swimming hairs.
Key morphological apomorphies defining Cercotmetus as provided by Lansbury (1973) include the outer margin of
the eyes sloping downward and obscuring the ventral margin of the head, the length of the fore femur shorter than the
prothorax, the middle and hind tibiae with fringes of long swimming hairs.
[ 本帖最後由 sykin 於 2016-2-24 12:04 編輯 ]