There are about 4500 species of true bugs. Most true bugs have 2 pairs of wings, though some can be wingless. The fore wings are partly horny at the front and covered with soft membrane in the back. When the bug is at rest the fore wings are held flat over the back and cover the hind wings. The membranous tips of the fore wings overlap in this position.
True Bugs have mouth parts made for piercing and sucking, sometimes, plants, other insects or blood.
Some aquatic true bugs fly, and often live under water swimming diving or clinging to water plants and debris. Others types cling to the water surface. Bug nymphs look like small wingless adults and go through 5 molts to reach adulthood. Nymphs can have either 1 or no appendages at the end of their abdomen. The wing buds of nymphs enlarge with each molt.