Another fossil crab from Texas is Xanthosia pawpawensis. These specimens were found in the Lower Cretaceous (Cenomarian stage, 97-98 mya) aged Pawpaw Formation. in Tarrant County, Texas. I received them in a trade with Herb M. who collected them himself. Thanks Herb!
I got the age info for the formation from Lance Hall's website North Texas Fossils. He has pictures of fossils he has found in the formation and some good information about the geology of the Paw Paw formation and the region in general.