Gauthieria sp., Travis Co.
My friend Lari gifted me the NSR guidebook and I found this name while reading through it. After some searching online it seems to match up with this urchin I found in the Austin Ozan last year. The tubercles are imperforate and crenulate. Gauthieria has been found up north in the NSR, but is extremely rare. In Austin I've found so far this compressed specimen which I sadly broke trying to extract (still kicking myself) and a smaller fragment still in my collection. I'm gonna have to make a return trip to the spot at some point and attempt to redeem myself!