Scientists have discovered a missing evolution puzzle piece in 130-million-year-old rocks. The discovery is a result of an international collaboration, in which the Faculty of Sciences of the University of Lisbon (Portugal) is involved.
and colonized a new harsh environment, located far away from their original habitat.
The newly discovered fossils represent not just the earliest deep-sea fishes but the earliest deep-sea vertebrates. The evolution of vertebrates—backboned animals—has been punctuated by habitat transitions from shallow marine origins to terrestrial, aerial and deep-sea environments. Invasion of the deep sea is the least-understood habitat transition because of the low fossilization potential associated with the deep sea.
In this study, researchers turned to present-day seas to understand fossil behavior, studying the behavior of modern fishes in their habitats. Scientists explored the depths of the Pacific Ocean to study chimeras, also known as ghost sharks, in their living environment.
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