Final answer:
Old World monkeys have sexual dimorphism, ischial callosities, and webbed fingers for swimming in aquatic habitats.
Step-by-step explanation:
Old World monkeys, which include monkeys from Africa and Asia, have several important characteristics other than locomotion. One key characteristic is sexual dimorphism, where males are significantly larger and heavier than females. Another characteristic is the possession of ischial callosities, which are thickened patches of skin on their seats. Additionally, some Old World monkeys have webbed fingers, allowing them to swim and live in aquatic habitats.