Pictured are mealworms. All arthropods have segmented bodies (lobsters, scorpions, millipedes, etc.). Segmentation refers to the repetition of units. Mealworms are composed of a head, a thorax, and an abdomen. The head takes up one segment of the body and it contains antennae, eyes, and a mouth. The thorax takes up about three segments and it’s located behind the head and above the legs. Finally, the abdomen is the rest of the mealworm’s body. It normally contains about nine segments.