👉 Uranomys is a genus of extinct marine organisms that lived during the Paleozoic era, around 489 million years ago. They were characterized by their large, streamlined bodies and a unique adaptation for swimming on the surface of the water. Their reproductive system was also distinct from other animals because they had a single egg sac with an internal fertilization process. Uromyids lived in shallow waters near the coast, and their fossils have been found in various parts of the world,