How do you fossilize skin, the kind that normally disappears within days or weeks? A new set of rock slabs from central Germany does it by preserving a reptile\u2019s body impression in fine sediment, complete with scaly textures that look surprisingly modern.<\/p>\n\n\n\n
An international research team led by paleontologist Lorenzo Marchetti says these marks are the oldest direct evidence of reptile skin identified so far, and one specimen may even preserve the outline of a cloacal opening near the base of the tail. The findings were announced by the Museum f\u00fcr Naturkunde Berlin<\/a> and published in the journal Current Biology.<\/p>\n\n\n\n The impressions come from the Thuringian Forest within the Goldlauter Formation, and they were discovered alongside tracks and \u201cresting traces,\u201d the subtle dents left when an animal settled its body onto soft ground. The newly described resting trace has been named Cabarzichnus pulchrus<\/em>, and it captures more than toe marks.<\/p>\n\n\n\n Two sites anchor the story: the Cabarz quarry near the town of Tabarz and another locality in the municipality of Floh-Seligenthal. Using modern radiometric dating<\/a> of volcanic ash layers within the same sediment package, the team dates the impressions to roughly 298 to 299 million years ago in the Early Permian.<\/p>\n\n\n\n The preserved scale patterns are not a single repeating motif. Researchers report shapes ranging from diamond-like to hexagonal and laterally pointed forms, a hint that early reptiles were already experimenting with different \u201cskins.\u201d The associated footprints also resemble those of bolosaurians, an early reptile group on the stem lineage leading toward modern lizards.<\/p>\n\n\n\n A footprint can be ancient without being precisely dated. What makes this find stand out is that the sediment includes volcanic ash horizons, which can be dated with radiometric methods and used to lock down a narrow time window for when the impressions formed.<\/p>\n\n\n\n That timestamp matters because the Early Permian sits in a broader arc of shifting climates and landscapes. In the study\u2019s abstract, the authors argue that differentiated epidermal scales were already present by the Asselian stage and that this skin adaptation likely predates major phases of Early Permian warming and aridification. That is a big claim, but it offers a clear ecological hypothesis to test.<\/p>\n\n\n\n Evolution often lays groundwork long before it becomes \u201cnecessary.\u201d A trait can begin as a modest upgrade, then turn into a dealbreaker when conditions change. Anyone who has dealt with dry winter air and cracked hands knows how quickly water balance becomes an everyday problem.<\/p>\n\n\n\n Reptile skin<\/a> is famous for being dry, tough, and heavily keratinized, and that is not just a cosmetic detail. Classic anatomy references describe the reptilian outer layer as a key solution to the challenge of preventing desiccation through water loss, with waxes and keratinized cells forming a tight barrier.<\/p>\n\n\n\n The new fossils focus on epidermal scales, not the bony dermal scales found in many fish and some early vertebrates. IntechOpen\u2019s overview of reptile skin notes that reptile scales are fundamentally different from fish dermal scales and are an integral part of the epidermis rather than detachable plates. <\/p>\n\n\n\n The researchers behind Cabarzichnus add that early amniotes likely saw epidermal and dermal scales coexist, with epidermal scale types differentiating very early in reptile history.<\/p>\n\n\n\n In practical terms, a better barrier means fewer hours hiding from dehydration and more time feeding, moving, and reproducing. On a Permian Earth that, for large regions, was trending toward dry to arid conditions<\/a> as the supercontinent Pangea assembled, those small advantages could compound over generations.<\/p>\n\n\n\n The most attention-grabbing detail is also the one scientists handle with the most care. In one specimen from Cabarz, the team reports a narrow, slit-shaped impression near the base of the tail that they interpret as possible evidence of a cloacal opening.<\/p>\n\n\n\n A cloaca<\/a> is a single opening used for both excretion and reproduction in most terrestrial vertebrates, with placental mammals as a major exception. The museum press release notes that this kind of soft tissue feature is almost never preserved in a clearly recognizable form, especially in rocks this old.<\/p>\n\n\n\n If the interpretation holds up, it suggests the cloaca\u2019s shape and orientation differed from that of dinosaurs and crocodiles and more closely resembled those of turtles, lizards, and snakes. But it is also the sort of claim that will be revisited as new material appears and as imaging techniques improve.<\/p>\n\n\n\n Researchers have long known that some dinosaur fossils preserve skin impressions, feathers, and other body coverings, but the odds drop sharply as you move deeper into geologic time. \u201cSuch soft tissue structures are extremely rare in the fossil record,\u201d Marchetti said in the museum\u2019s announcement, underscoring why this find is unusual.<\/p>\n\n\n\n This is also a win for trace fossils, which record behavior as well as anatomy. \u201cTrace fossils are far more than simple footprints,\u201d Marchetti added, and he argues they preserve details that are often missing from bones alone. <\/p>\n\n\n\n For evolutionary and ecological research, that can be the difference between guessing an animal\u2019s lifestyle and actually seeing how it touched the ground.<\/p>\n\n\n\n The work was completed within the BROMACKER research project<\/a>, funded by Germany\u2019s Federal Ministry of Research, Technology and Space, and it highlights a quiet truth about adaptation. Sometimes the most important innovations are not teeth or claws, but the skin that keeps an animal alive between meals.\u00a0<\/p>\n\n\n\n The study was published in Current Biology<\/em><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":" How do you fossilize skin, the kind that normally disappears within days or weeks? A new set of rock slabs … <\/p>\nA fossil that is more than a footprint<\/h2>\n\n\n\n
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The cloaca clue near the tail<\/h2>\n\n\n\n
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