Love the L600s.I think its Colombian panaque cochilodon. It's suttonorum, not suttoni.
I have a pair of "real" panaque suttonorum with "rough body spikes".
Here's good sites for picture comparsion:
http://www.keknet.com/index.php/article-75589
http://guanshangyu.cc/thread-828325-1-1.html
I thought earlier too that they are L600, but they are not. 95 % of sold L600's are actually LDA07.Love the L600s.