As there is ONLY the genus Aphonopelma sp for ANY tarantulas in the USA, then of course its going to be an Aphonopelma sp. If you give an EXACT LOCATION, then maybe some with experience of the native species there can narrow it down to a couple of likely species, but without sending it to a taxonomist, then your not going to get an accurate identification.
Its a wandering adult male. If you have an exact locality, then it is well worth contacting Dr Brent Hendrixson at Millsaps college MS, or Chris Hamilton at East Carolina University (Lab of Dr Jason Bond), and seeing if either of them want it for a current project they have going on. Otherwise, best to release it where you found it, but not in another location, only where you found it.
> Brachypelma not common in S.Texas? There are actually no other tarantula genera except Aphonopelma in the whole USA ! (except a small population of introduced B.vagans that was established in florida)
> Why guess if you are not 'a new world fan' ?