Dont want to gravehump this and I certainly dont want to bash on your parade but ever since I got more into Tityus its easier to distinguish them.
I have to put this into your other obscurus thread too.
The ones you say are obscurus are in fact asthenes, which are equally impressive btw and I wished all mine were already as big as yours.
This is meant to set things straight and to prevent unvolunteeringly false information being spread.
compare
obscurus male (females are slightly stockier but not by much)
asthenes (female, i think)
Ask me my opinion and I say asthenes are far more daunting to look at while obscurus are just more rare.