Lybia

Lybia is a genus comprising eight species of small marine crabs from the family Xanthidae. Commonly known as boxer crabs and pom-pom crabs, these crabs are famous for their symbiosis with small aquatic invertebrates, particularly sea anemones, which they hold in their specialized claws for defense, and in some cases, feeding. The genus has a diverse distribution, ranging across the Indo-Pacific and existing as early as the Middle Miocene.