👉 Topomesoids are a group of extinct arthropods that lived during the Late Cretaceous period, approximately 67 million years ago. These arthropods were characterized by a combination of large size and multiple appendages, which allowed them to move through their environment more efficiently than smaller arthropods. They had a single, long, flexible thorax with eight legs (four forelimbs, four hindlimbs), and a tail that could be used for climbing or maneuvering.
