Paleontologists have recognized a brand new species of historical marine reptile from Germany’s world-renowned Posidonia Shale fossil beds, increasing our understanding of prehistoric ocean ecosystems that existed almost 183 million years in the past.
The newly categorized species, named Plesionectes longicollum (“long-necked near-swimmer”), represents a beforehand unknown kind of plesiosauroid — the group of long-necked marine reptiles that inhabited Earth’s oceans in the course of the age of dinosaurs. The specimen is an almost full skeleton that even preserves remnants of fossilized comfortable tissue. It was initially excavated in 1978 from a quarry in Holzmaden, Southwest Germany, however its distinctive anatomical options have solely now been absolutely acknowledged by means of complete scientific evaluation.
“This specimen has been in collections for many years, however earlier research by no means absolutely explored its distinctive anatomy,” mentioned Sven Sachs of the Naturkunde-Museum Bielefeld, the examine’s lead creator. “Our detailed examination revealed an uncommon mixture of skeletal options that clearly distinguish it from all beforehand recognized plesiosaurs.”
The analysis, revealed by Sven Sachs and co-author Dr. Daniel Madzia from the Polish Academy of Sciences, demonstrates that the Posidonia Shale — already well-known for its exceptionally preserved fossils — contained even larger marine reptile range than beforehand acknowledged.
The Plesionectes specimen is especially important because it represents the oldest recognized plesiosaur from the Holzmaden space. Regardless of being an immature particular person, its distinctive anatomical traits weren’t considerably affected by its developmental stage, warranting classification as a completely new genus and species.
“This discovery provides one other piece to the puzzle of marine ecosystem evolution throughout a important time in Earth’s historical past,” defined Dr. Madzia. “The early Toarcian interval when this animal lived was marked by important environmental modifications, together with a significant oceanic anoxic occasion that affected marine life worldwide.”
The fossil is completely housed on the Staatliches Museum für Naturkunde Stuttgart (Stuttgart State Museum of Pure Historical past) the place it’s cataloged as specimen SMNS 51945.
The Posidonia Shale at Holzmaden has beforehand yielded 5 different plesiosaur species, together with representatives from all three main plesiosaur lineages. This new addition additional cements the formation’s standing as one of many world’s most necessary home windows into Jurassic marine life.
