Is this scorpion considered a mature adult

[Nocturnalnature]

My wife and kids surprised me with 1.2 trio of Heterometrus silenus (my first scorpion additions to my invertebrate collection) from the local specialty shop, and I’d like an opinion or two on whether they are considered mature adults since I would like to try to pair them if they’re ready.

All three are the same size.
The cork bark is 5.5 inches in length, so with a fully outstretched tail that would make them about 4.5 inches long (excluding the pincers).
I have read that this species gets bigger, but if you notice in the photo, the male has the pronounced bump on the bottom part of his pincers, which I have read only appears in mature animals.
This has me a bit confused since they aren’t as big as I had imagined adults would be.

As always, thanks for taking the time to reply!

 

[Outpost31Survivor]

It looks mature to me.

 

[Nocturnalnature]

It looks mature to me.

What makes you lean that way, if I might ask?
As mentioned, these are my first scorpions, and I imagined mature specimens would be bigger.

 

[adam james]

The bump on the movable finger is a good indication.

 

[MorbidArachnid]

The bump on the movable finger is a good indication.

This. Those are Heterometrus silenus, only the mature males get a bump on the moveable finger. As for the size discrepancy, I think a lot of sources largely exaggerate and overreport sizes, sometimes talking about "gets an average of X inches" when that number only represents an extreme outlier or an unusual population. IME H silenus get around 4", largest one I've seen was a bit over that.

 

[Nocturnalnature]

Thanks for the input folks!

i believe I’ll let them settle in for a month or so and then try an introduction of the male into each one of the female’s enclosures to see if either of them are receptive.

 

[Nocturnalnature]

Double post.
Sorry about that!

 

[Outpost31Survivor]

What makes you lean that way, if I might ask?
As mentioned, these are my first scorpions, and I imagined mature specimens would be bigger.

No, that is about the average size they can get larger but you'll often see sellers label them as "XL". The rarely available Heterometrus spinifer get larger than H. silenus.

 

[Nocturnalnature]

No, that is about the average size they can get larger but you'll often see sellers label them as "XL". The rarely available Heterometrus spinifer get larger than H. silenus.

Thank you very much!
That’s precisely the kind of information I was looking for.