👉 The term "Callitrichidae" refers to a group of small, marine invertebrates that belong to the order Chondricha and are classified within the family Callitrichidae. These animals are characterized by their small size, which enables them to live in water depths up to 10 meters (33 feet) deep. They have a short, sharp beak that is used for tearing apart algae, which are essential for photosynthesis in marine ecosystems.