Iconic Triassic Reptile Keichousaurus | Pregnant Individual Fossil Keichousaurus is a small marine reptile from the Triassic Period, primarily discovered in Guizhou Province, China. It represents one of the most recognizable and well-studied early marine reptiles, playing an important role in understanding the evolution and reproductive strategies of early marine reptiles. Confirmed pregnant individuals of Keichousaurus are exceptionally rare. Such specimens provide critical evidence for viviparity (live birth) in early marine reptiles and offer invaluable insight into reproductive biology during the early stages of marine adaptation. Due to their scientific importance and rarity, pregnant Keichousaurus fossils have historically been favored by museums and top-tier private collections, with relatively few examples entering the open market. About Keichousaurus： Keichousaurus was a fully aquatic reptile with an elongated body, limbs retaining distinct digits and inferred to have well-developed webbing, and a powerful tail adapted for swimming. It primarily inhabited shallow marine environments during the Middle Triassic. Fossils of this genus are commonly found with well-articulated skeletons and natural postures, making Keichousaurus an important taxon for studying the diversification and evolution of early marine reptiles, as well as a highly valued subject for both academic research and private and institutional collections. ⸻ Specimen Information: • Species: Keichousaurus • Geological Period: Triassic (approximately 240 million years ago) • Locality: Guizhou Province, China • Condition: Maternal skeleton clearly preserved, with visible embryonic remains within the abdominal cavity • Preservation: Natural stone slab with strong anatomical detail and high display quality