Pilbara study uncovers unique fly community

March 31, 2014 by Geoff Vivian
A fly from the same family (Dolichopodidae) as the 19 newly described species found in the Pilbara. Credit: Sam Fraser-Smith

A Sydney-based entomologist has described a new single-species fly genus, found only at Millstream near Karratha.

Pilbara octava is a member of the family Dolichopodidae, and one of 19 that Australian Museum expert Dr Daniel Bickel described during a survey of Pilbara flies.

He says it helps tell the tale of a time when much of central Australia was moist and forested and the various he found in the Pilbara were widely-distributed across the continent.

"As it gets drier a lot of these species can only survive in areas where there's like permanent water," he says.

"Places like Millstream, which is an old river system that has permanent water holes, certainly might be a sort of place where you would find these sort of things."

He also recorded 25 flies already described.

"One of the things that also came through in this...is how many species are actually not only just Australian but they are actually found in New Guinea and some even go out to the Solomons," he says.

Dr Bickel says he found only one species (Parentia vulgaris) that is not of a "tropical" genus.

"It's from a group that otherwise is only [found in] southern Australia and New Zealand and something which is much more of a typical Gondwanan cool-adapted group," he says.

"It also gets into the Queensland tropics.

"Often what you find in these genera, you find most of the genus are often tied to a certain habitat or a certain climatic region.

"And yet there's always a few that break out and sort of adapt  —  that's the way that these things get around and expand their ranges."

While Dr Bickel did some collecting of his own near Cape Range and further inland, he says most of the survey involved studying unclassified material already preserved in collections at CSIRO Canberra, the Australian Museum in Sydney, and the WA Museum.

"I didn't do any DNA bar coding on this," he says.

"I'm just doing very basic description, morphologic description.

"A lot of the specimens that are used, these are the old dried specimens.

"You can't get good DNA barcodes out of them."

He says Chevron agreed to fund the whole-of-Pilbara study when it asked him for an inventory of Barrow Island flies.

"We can now say what's on the island and if there's any change that occurs there we can say we had a baseline set of data to begin with."

Explore further: Millipede family added to Australian fauna

Related Stories

Millipede family added to Australian fauna

August 30, 2012

An entire group of millipedes previously unknown in Australia has been discovered by a specialist – on museum shelves. Hundreds of tiny specimens of the widespread tropical family Pyrgodesmidae have been found among bulk ...

Recommended for you

Smarter brains are blood-thirsty brains

August 30, 2016

A University of Adelaide-led project has overturned the theory that the evolution of human intelligence was simply related to the size of the brain—but rather linked more closely to the supply of blood to the brain.

Herbicides can't stop invasive plants. Can bugs?

August 31, 2016

Over the past 35 years, state and federal agencies have spent millions of dollars and dumped untold quantities of herbicides into waterways trying to control the invasive water chestnut plant, but the intruder just keeps ...

Defend or grow? These plants do both

August 30, 2016

From natural ecosystems to farmers' fields, plants face a dilemma of energy use: outgrow and outcompete their neighbors for light, or defend themselves against insects and disease.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.