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It is approx 2cm long and was discovered in house after a bush walk & BBQ at Riverside Garden Reserve in Mandurah, Western Australia. It has 6 legs.

Thanks! :-)

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  • $\begingroup$ Welcome to Biology.SE. I edited your question slightly for improved readability. Please feel free to further edit. $\endgroup$ – AlexDeLarge Jun 2 '17 at 8:55
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    $\begingroup$ It's almost certainly a beetle larvae/grub of some sort, but I'm afraid I don't know what species! $\endgroup$ – Jonathan Page Jun 2 '17 at 9:02
  • $\begingroup$ Lyn, I took the liberty to reedit your post to improve presentation. $\endgroup$ – Tyto alba Jun 2 '17 at 9:04
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This is a Sawfly larvae, and is most likely of the species Perga dorsalis or Perga affinis. The larvae you depict appears to be quite young, but as it matures it'll gain a much darker color, and, depending on whether it's P. affinis vs. P. dorsalis, the abdomen will grow fairly long.

I imagine the developmental progress of your larvae is somewhere between the two following larvae.

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A few more images:

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