The thorax and abdomen are the two melded segments. These form the "cephalothoraxes" segment.
What is exoskeleton?
In contrast to the internal skeleton of a human, an exoskeleton is the external skeleton which also endorses and safeguards the body of an animal.
Some of the significantly bigger exoskeletons are referred to as "shells" in popular parlance.
The exoskeleton also acts as a water-tight barrier, safeguarding the insect from desiccation.
The wax-covered epicuticle contains the majority of the barrier. The exoskeleton serves an important function in preventing microorganisms from entering the animal's interior.
The two merged segments are the thorax and abdomen. The "cephalothoraxes" segment is made up of these.
Thus, the two fused segments are the thorax and the abdomen.
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