What are the differences between chelicerates and uniramians?

Chelicerates and uniramians are two distinct groups within the arthropods. Chelicerates, which include Spiders, scorpions, and ticks, possess specialized mouthparts called chelicerae and typically have two body segments: the cephalothorax and abdomen. In contrast, uniramians, which encompass insects and myriapods (like centipedes and millipedes), have a single pair of antennae, mandibles for feeding, and a body divided into three main parts: head, thorax, and abdomen. Additionally, uniramians usually have segmented appendages (limbs) that are often unbranched, whereas chelicerates have simpler, often non-segmented appendages.