Different kinds of true bugs can be very different sizes. The smallest are only a few millimeters long. The largest, the cicadas, can sometimes be 50 millimeters long.
True bugs have lots of different shapes. They may have long or short antennae having four or five segments. Their legs are adapted for grasping or for walking, and sometimes for swimming. Some can fly, some have lost their wings. Many true bugs have scent glands on the sides of the thorax. These glands make stinky chemicals that repel predators.
The mouth parts of true bugs have evolved into a long thin beak. They only eat liquid foods. The beak extends back between the legs to rest against the underside of the bug, and they swing it down and forward for use during feeding. The beak is made up of thin blades that are sharp at the end, and have a segmented cover. There are two channels in the beak, one spitting out saliva to keep the food flowing, and one for sucking in liquid food. Some true bugs can give a painful bite.
Adult true bugs have two pairs of wings, except for a few groups that have evolved to lose their wings. In one big group of true bugs, the front pair of wings are partly leathery, partly clear.
In most true bug species, males and females look similar.
Range length: 5.0 to 60.0 mm.
Other Physical Features: ectothermic ; heterothermic ; bilateral symmetry
Sexual Dimorphism: sexes alike
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