How Did Different Species of Telescopefishes Evolve in the Barrier-Free Deep Sea?

演化之聲
Mar 14
5 min read

The deep ocean is a realm of darkness, cold temperatures, and immense pressure, yet it harbors some of the most mysterious organisms on Earth. Compared with terrestrial ecosystems, scientists still know remarkably little about how deep-sea species evolve or how new species arise in what appears to be a vast, uninterrupted body of water. Without obvious geographic barriers such as mountains or rivers, how can populations diverge into distinct species? To explore this question, researchers examined two closely related telescopefishes of the genus Gigantura: Gigantura chuni and Gigantura indica. These fishes inhabit depths ranging from roughly 200 to 3,000 meters below the ocean surface and are highly specialized for life in dimly lit waters. Their tubular eyes project forward like tiny periscopes, enabling them to detect faint traces of light in the deep ocean, while their elongated bodies and narrow, tooth-lined jaws reflect a lifestyle built around hunting prey in darkness.