Experts have discovered an “almost-complete” fossil of a 150-million-year-old 鲨鱼 in Germany, giving them a nearly unprecedented look into Earth’s distant past.
研究, published in the scientific journal Papers in Palaeontology, describes a fossilized Asteracanthus, which lived between 361 million years and 66 一百万年前. The fossil was discovered in the Solnhofen limestones in Bavaria, 德国, famous for the discovery of the first archaeopteryx and other shark and ray skeletons.
“The specimen is represented by an almost completely preserved skeleton of the extinct hybodontiform shark Asteracanthus, the total length of which was two-and-a-half meters in life, which made it a giant among Jurassic sharks,” 一个 声明 from the University of Vienna reads.
Asteracanthus was a type of Hybodontiformes, a close relative of modern sharks and rays. Hybodontiformes had two dorsal fins and ranged in size, with some as small as a few centimeters, all the way to nearly 10 feet in length.
While ancient shark teeth have been found all over the world, because they are made of cartilage, fossilized shark skeletons are rare.
The fossil of Asteracanthus contained more than 150 teeth, which all had “a well-developed central cusp that is accompanied on both sides by several smaller cusplets,” the university added.
“This specialized type of dentition suggests that Asteracanthus was an active predator feeding on a wide range of prey animals,” study co-author Sebastian Stumpf explained. “Asteracanthus was certainly not only one of the largest cartilaginous fishes of its time, but also one of the most impressive.”
Asteracanthus was first discovered by Swiss-American naturalist Louis Agassiz nearly 180 years ago after looking at “isolated fossil dorsal fin spines,” the university added.
十一月, 研究人员 发现 a 370-million-year old shark with bizarre teeth.