Moved from Trichoniscus. As the only species of Trichoniscus found in the United States are T. pusillus and T. pygmaeus, and as this specimen is too narrow to be either and too large and well-pigmented to be the latter, and as neither species has been reported from Texas, it is highly unlikely that this animal is from that genus. Its narrow habitus and otherwise generally similar appearance to the photo of the other animal you posted makes me think this is most likely a species of Miktoniscus.

Thanks for the ID. I saw we had expert on isopods, and hoped you could ID it. Thanks again.

Hi!
This isopod belongs to the family Trichoniscidae, and is surely a species from the Trichoniscus genus.
Under microscope you can observe that its compound eyes are consisted of 3 "ocelli", that distinguishes them from species of other genera, but identifying species is not possible through the image.
Interestingly, the common species Trichoniscus pusillus is often parthenogenetic, therefore almost no males can be found in the nature.
Best wishes,
Ferenc