Victorian fish fossil fills ancient gap

Aug 28, 2006

The oldest known fossil coelacanth has just been described by Macquarie University researchers in the international journal Biology Letters, in conjunction with colleagues in Victoria and Paris.

The coelacanth (“see-la-kanth”) is a “living fossil” fish with “proto legs” that pre-dates the dinosaurs by millions of years. It was once thought to have gone extinct with them, 65 million years ago, but was rediscovered living in the Indian Ocean in 1938.

This new coelacanth fossil was collected by Professor John Talent of the Macquarie University Centre for Ecostratigraphy and Palaeobiology from Early Devonian rocks in Victoria in the 1970s. At nearly 400 million years old, it is much older than previously known coelacanth fossils.

Coelacanths are classified, along with lungfish (including Neoceratodus forsteri, the Queensland lungfish) in the group Sarcopterygii. Fossil records of other major sarcopterygian groups, including the lungfish, extend to the beginning of the Devonian, but until now coelacanth fossils were known only from the Middle Devonian (385-390 million years ago), indicating an unfilled fossil ‘gap’.

Talent and Macquarie colleague Dr Zerina Johanson have now filled this gap, with the description of the new species Eoactinistia foreyi. Although only known from a single lower jaw bone, it preserves an intriguing mix of primitive and more derived coelacanth jaw characters. For example, a pore opening is present that is otherwise only found among substantially younger coelacanths. This new fossil hints that there is still much to be learned about the early history of the coelacanths.

Source: Macquarie University

Explore further: Oldest DNA ever found sheds light on humans' global trek

add to favorites email to friend print save as pdf

Related Stories

MasterCard, Zwipe announce fingerprint-sensor card

8 hours ago

On Friday, MasterCard and Oslo, Norway-based Zwipe announced the launch of a contactless payment card featuring an integrated fingerprint sensor. Say goodbye to PINs. This card, they said, is the world's ...

Plastic nanoparticles also harm freshwater organisms

9 hours ago

Organisms can be negatively affected by plastic nanoparticles, not just in the seas and oceans but in freshwater bodies too. These particles slow the growth of algae, cause deformities in water fleas and impede communication ...

Atomic trigger shatters mystery of how glass deforms

9 hours ago

Throw a rock through a window made of silica glass, and the brittle, insulating oxide pane shatters. But whack a golf ball with a club made of metallic glass—a resilient conductor that looks like metal—and the glass not ...

US company sells out of Ebola toys

18 hours ago

They might look tasteless, but satisfied customers dub them cute and adorable. Ebola-themed toys have proved such a hit that one US-based company has sold out.

Recommended for you

New evidence on Neanderthal mixing

2 hours ago

New research on a 45,000-year-old Siberian thighbone has narrowed the window of time when humans and Neanderthals interbred to between 50,000 and 60,000 years ago, and has shown that modern humans reached ...

User comments : 0