A recent study has shed light on a remarkable 183-million-year-old plesiosaur fossil. This ancient specimen showed both smooth and scaly skin, prompting scientists to rethink long-held views about these prehistoric sea creatures. For years, plesiosaurs swam in Earth’s oceans, from about 66 million to 215 million years ago. While their skeletal structures have been studied extensively, insights into their skin and external features remained elusive until now.
The fossil, known as MH7, was discovered in 1940 in a quarry in Holzmaden, Germany. However, it sat in storage at the Urwelt-Museum Hauff until scientists revisited it in 2020. The unique conditions of the region helped preserve some soft tissues, allowing researchers to analyze tiny samples from its tail and flippers.
Miguel Marx, a paleobiologist from Lund University, led the analysis. He found well-preserved skin cells that revealed crucial details about the plesiosaur’s appearance.
“The well-preserved fossil highlights the potential for soft tissue to provide valuable insights into the biology of these long-extinct animals,” said Marx.
Researchers noticed smooth skin on the tail and scales along the edges of the flippers. This distinction helps create more accurate reconstructions of plesiosaurs’ bodily forms, something that has challenged scientists for over 200 years.
Preserving soft tissues is quite rare in paleontology, especially for marine reptiles. While bone fossils are common, the organic matter of skin or muscle typically decays over time. A study published in Current Biology noted that only about eight plesiosaurs with preserved soft tissues have been found. The exceptional conditions in Holzmaden helped maintain the fossil’s integrity.
Understanding the structure of soft tissues gives researchers a better glimpse into how these animals lived and functioned in their environments, moving beyond skeletal features.
The discovery of scales on the plesiosaur’s flippers provides insights into its movement. These scales may have helped the creature swim more efficiently, similar to how sea turtles use their scales for better propulsion. The smooth skin on the tail likely reduced drag, enhancing speed and efficiency while swimming.
Scientists like F. Robin O’Keefe from Marshall University pointed out that this varying texture could have supported the plesiosaur’s hunting strategies. He suggested that instead of relying on extreme efficiency in movement, the plesiosaur likely thrived as an active predator, patrolling the waters for food.
This new understanding of plesiosaur features demonstrates the value of revisiting old findings. With every new perspective, we edge closer to painting a clearer picture of life that existed millions of years ago.
