👉 Chilomys is a genus of extinct marine reptile that lived during the Late Triassic period, approximately 258 million years ago. It was known for its unique and distinctive appearance, which included a large, elongated head with a bulbous snout and a long, slender neck. Chilomys had an elongated body, with a single spine running along its back and a pair of long, pointed legs that were adapted to swimming in water.