Reconstruction of Siphodracon it might have looked like
Bob Nicholls
Presenting the “sword dragon,” a recently identified species of ichthyosaur, a predatory ancient reptile that ruled the oceans during the reign of the dinosaurs on land.
This exquisitely preserved fossil skeleton was unearthed in 2001 near Golden Cap on England’s Jurassic Coast and remained in museum storage for many years. Royal Ontario Museum in Canada.
Dean Lomax of the University of Manchester, UK, stated: “They recognized it was something notable.” “They intended to study it, but ultimately did not.”
Lomax and his team have carefully examined and classified a specimen with large eye sockets and a sword-like elongated snout. The fossil contains “needle-like teeth,” adapted for consuming soft-bodied prey such as squid and fish. “This provides great insight into the lifestyle of this creature while it was alive. Essentially, it likely hunted in dim environments and depended on exceptional vision,” Lomax explained.
The creature measured approximately 3 meters in length, roughly the size of a bottlenose dolphin, and is believed to have existed during the Early Jurassic period, specifically the Pliensbachian epoch, around 193 to 184 million years ago.
Its anatomical features are unprecedented among ichthyosaurs, including a distinctive lacrimal bone with an unusual structure surrounding its nostrils. “The preservation quality, especially of delicate elements like cranial sutures and the lacrimal and prefrontal processes, is remarkable,” remarked Aubrey Roberts from the Natural History Museum, University of Oslo, Norway.
The black mass found between the ribs may represent its final meal, although the researchers were unable to identify it.
Fossilized Xiphodracon Golden Capensis
Dr. Dean Lomax
This ichthyosaur has been named for its menacing snout: Siphodracon Golden Capensis, known as the golden-capped sword dragon.
This specimen also provides valuable insight into the evolution of ichthyosaurs. “The greatest significance of this discovery lies in its age,” remarked Roberts. During the latter part of the Triassic, massive superpredator ichthyosaurs such as Ichthyotitan, reaching lengths of nearly 25 meters, existed alongside species as large as blue whales, but these titans vanished following a mass extinction event at the end of the Triassic, approximately 201.4 million years ago, marking the onset of the Jurassic period.
Fossils of various smaller ichthyosaurs have been discovered that date back to the Jurassic period, as Lomax pointed out. Many have been identified since the Pliensbachian period, but no common species exist, and there are two distinct types.
“Triassic ichthyosaurs were well-known for their uniqueness,” explains Neil Kelley of Vanderbilt University, Tennessee. “Their Jurassic successors are often perceived as somewhat more uniform, sharing a superficially dolphin-like appearance.”
“Siphodracon contributes another shade to the broad spectrum of ichthyosaurs,” he added, supporting evidence that Jurassic ichthyosaurs adopted a range of lifestyles, featuring diverse diets, swimming speeds, and habitat preferences.
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Topics:
- Paleontology/
- Marine Life
Source: www.newscientist.com
