Hi
@tropicbreeze. Carlia is yet another genus in a state of flux. They did a good job of sorting out and delineating the east coast species several years ago. Since then not a lot of work has been done on the more westerly ones as far as I know. Two new species were delineated from existing species in northern WA extending into the NT in 2017. Anything beyond that I would not be aware of. I’d love to pick David Knowles’ brain on this because I know how much time he spent researching these critters in the lab and in the field prior to publishing the book he did with Steve Wilson. Unfortunately I have not seen Dave for several years so I feel that would not be appropriate. One thing I can tell you about ID’ing Carlia species is that they have very limited specific physical attributes that can be used, such as scale keels, ear lobules and head plates.
It seems to me that you photographed three different skinks - please let me know if that is the case. Irrespective, I suspect that there are two different species involved here. I have an idea of what these may be, but need to do further research to confirm that if I can. Unfortunately all my field guides are still packed up at the moment and that severely restricts the quality of information I would normally have ready access to.