Isisford Bulldog fish emerges from 100-million-year slumber

Apr 19, 2013
Isisford Bulldog fish emerges from 100-million-year slumber
A life-size reconstruction of the Isisford bulldog fish by model-maker Esben Horn of 10 Ton, Denmark. Credit: Steve Salisbury, The University of Queensland

The Isisford bulldog fish, which surfaced from a 100 million year slumber eight years ago, will make its public debut at the Outer Barcoo Interpretation Centre in Isisford tomorrow (Saturday 20 April).

The Central Western Queensland fossilised fish was unearthed in a 2005 dig led by The University of Queensland's Dr Steve Salisbury.

The fossil of the large, fast-swimming predatory fish is estimated to be between 103 and 100 million years old, and belongs to a group of fishes known as ichthyodectiforms.

Ichthyodectiforms are an of fishes that were a common element of shallow faunas during the latter part of the .

Their large, upward opening jaws and jagged teeth have led them to be commonly referred to as 'bulldog fish'.

UQ's School of Biological Sciences researcher, Mr Kerry Geddes, said the fossil was entombed in a single nodule of sandstone, close to where the skull of Isisfordia duncani, the world's first modern crocodilian, was found.

"I decided to hit the nodule with my hammer and was surprised to find the preserved near-perfect skull and front half of the body," Mr Geddes said.

"We estimate the fish to have been just under a metre long."

UQ's School of Biological Sciences graduate Rodney Berrell prepared and studied the fossil.

"Preparation of the fossil took about six months using a combination of drilling and diluted acetic acid to gradually expose the ," he said.

Based on comparisons with other fossilised and living fishes, Mr Berrell and experts from Mexico and Japan, surmise this specimen belongs to a type of ichthyodectiform known as Cladocyclus.

"The Isisford represents the first record of Cladocyclus in Australia, and indicates that species of this fish also inhabited freshwater environments," Mr Berrell said.

and paleontologist Dr Steven Salisbury also studied the bones.

"It is likely that the Isisford bulldog fish travelled up river to Isisford from the contracting Eromanga Sea, which was probably still open to the north through the Gulf of Carpentaria when the Isisford fossils were deposited," he said.

"Together with the crocodilians found previously, these fishes are helping us piece together aspects of the unique fauna that inhabited this part of Queensland during the later part of the Age of Dinosaurs," Dr Salisbury said.

Explore further: Divers sure of new finds from 'ancient computer' shipwreck

add to favorites email to friend print save as pdf

Related Stories

Fossil fish shows oldest live birth

Feb 25, 2009

( -- A 380-million-year-old fossil fish that shows an unborn embryo and umbilical cord has been discovered, scientists report in the journal Nature.

Local dig uncovers new species of ancient fish

Mar 07, 2013

( —Researchers from The Australian National University (ANU) working on the New South Wales south coast have discovered a new species of ancient fish, after unearthing the largest fossilised lobe-finned ...

Why certain fishes went extinct 65 million years ago

Mar 26, 2009

Large size and a fast bite spelled doom for bony fishes during the last mass extinction 65 million years ago, according to a new study to be published March 31, 2009, in the Proceedings of the National Ac ...

Australia's stampeding dinosaurs take a dip

Jan 08, 2013

(—Queensland paleontologists have discovered that the world's only recorded dinosaur stampede is largely made up of the tracks of swimming rather than running animals.

Recommended for you

NOAA team reveals forgotten ghost ships off Golden Gate

2 hours ago

A team of NOAA researchers today confirmed the discovery just outside San Francisco's Golden Gate strait of the 1910 shipwreck SS Selja and an unidentified early steam tugboat wreck tagged the "mystery wreck." ...

Long lost Roman fort discovered in Gernsheim

3 hours ago

In the course of an educational dig in Gernsheim in the Hessian Ried, archaeologists from Frankfurt University have discovered a long lost Roman fort: A troop unit made up out of approximately 500 soldiers ...

User comments : 0