Water Striders, Gerridae seen striding on the surface of the water of a river in Khao Yai National Park, Thailand

water striders pond skaters ripples pond hydrophobic microhairs water freshwater skimmers river insects gerridae hydrofuge wildlife surface lucanidae bugs retractable preapical claws skeeters wings elongated animals nature gerroidea gerrids khao yai national park skippers halobates antennae hemiptera body green marine natural habitat pleuston biology forest unesco horns legs surfaceliving piercing sucking rainforest thailand jesus gugs world heritage etymology tropical hairpiles