Xanthidae is a family of crabs commonly known as true crabs. They are primarily found in marine environments, particularly in tropical and subtropical regions. Members of this family are characterized by their robust bodies and often bright colors, which can serve as a warning to predators about their toxicity. Many species within the Xanthidae family possess venomous properties, making them unpalatable to potential threats. They play an important role in their ecosystems, often feeding on detritus and algae, which helps maintain the health of their habitats. Their unique adaptations and behaviors make them a fascinating subject of study in marine biology.