👉 Phallonemertidae is a group of extinct arthropod dinosaurs that lived during the late Cretaceous period, approximately 68-65 million years ago. These dinosaurs are known for their large size and distinctive features, including the elongated head, powerful legs with thick pads, and long, curved forelimbs. Their bodies were covered in a hard, feather-like exoskeleton made of chitin, which allowed them to climb on land and avoid predators.