SATURDAY, 28 MAY 2016
![OLYMPUS DIGITAL CAMERA](https://bluesci.co.uk/wp-content/uploads/2016/05/Temnosewellia14_Credit_David_Blair-300x225.jpg)
We’ve all heard about extinction – species lost forever but what happens when another species is entirely dependant on the one that is lost? Co-extinction, that’s what. On the flip side, now that we know what’s at stake, concerted efforts to secure the crayfish’s future will also ensure one for the tentacle flatworm. This is my kind of 2 for 1 offer.
![Video showing temnocephalan worms attached to a spiny mountain crayfish from Sydney _Video credit David Blair James Cook University](https://farm8.staticflickr.com/7296/27193494832_94189280bf_n.jpg)
Image & video: David Blair/James Cook University
Written by Michelle Cooper