Water strider, wingless -  about 10mm

Water striders' legs are covered with microsetae, microscopic hairs that trap tiny bubbles of air, allowing them to float on top of the water.

Water striders are predacious and carnivorous. The front legs have become shortened and adapted to catching and holding prey while the bug sucks out internal juices (fig.1). The middle set of legs are used like oars to propel the bug through the water, and the hind legs are used for steering.

Water striders can vary in length from 1.6 mm to 36 mm. Their body shape ranges from slender and elongate to almost completely round.  Similar to other bug groups (such as Pyrrhocoridae), the development of wings can vary significantly within the same population. Most of the individuals in a community are wingless, but a few develop fully formed flying wings which are used in moving to distant locations and establishing new breeding populations.