Remains of a Prehistoric Reptile that Resembles Modern Swordfish Discovered

A new marine reptile has been found by international researchers from Canada, Colombia, and Germany. One of the few remaining ichthyosaurs-ancient animals that appear remarkably like live swordfish-the specimen is a superbly preserved meter-long skull.

The researchers claim that this new species clarifies the overall picture of ichthyosaur evolution. "We were able to establish a new type of ichthyosaur by comparing this species to other Jurassic and Cretaceous ichthyosaurs," explains Erin Maxwell of the State Natural History Museum Stuttgart (a graduate student of Hans Larsson's group at McGill). "This upends the ichthyosaur evolutionary tree and allows us to explore fresh theories about how they originated."

According to the researchers, this species hails from a critical transitional era during the Early Cretaceous period. The Earth was emerging from a relatively chilly phase, sea levels were increasing, and the supercontinent Pangaea was dividing into northern and southern landmasses during this time. At the end of the Jurassic, a worldwide extinction catastrophe also altered marine and terrestrial ecosystems. "Many traditional Jurassic marine ecosystems of deep-water feeding ichthyosaurs, short-necked plesiosaurs, and marine-adapted crocodiles were superseded by new lineages of long-necked plesiosaurs, sea turtles, enormous marine lizards known as mosasaurs, and now this monster ichthyosaur," Dirley Cortés adds.

Discovering New Species

"We're discovering many new species in the rocks that this new ichthyosaur came from, and we're using the fossils to better understand the evolution of marine ecosystems during this transitional period," she adds. "We're testing the idea that this region and time in Colombia was an ancient biodiversity hotspot, and we're using the fossils to better understand the evolution of marine ecosystems during this transitional time," she says. In the following step, the researchers will investigate the vast collection of new fossils in Colombia's Centro de Investigaciones Paleontológicas. "This is where I grew up," Cortés recalls, "and it's fulfilling to be able to perform research here as well."

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