Final answer:
Myriapoda are divided into four classes: Chilopoda, Diplopoda, Symphyla, and Pauropoda, based on the number of legs and other characteristics. They have a single pair of antennae and simple eyes.
Step-by-step explanation:
The Myriapoda are divided among four classes: (1) Chilopoda (centipedes), (2) Diplopoda (millipedes), (3) Symphyla (symphylans), and (4) Pauropoda (pauropods). They range from having over 750 legs to having fewer than ten legs. They have a single pair of antennae and simple eyes.