Last night one of my 2 Uroplectes pilosus females gave birth to about 16-17 babies. I raised the mother from 2nd instar, so I am very happy with this result. The mating was in january, so 5-6 months gestationperiod in this case.
It took 8-9 months to reach the sixth instar, but the male I have is 5th instar and obviously sexually mature. I think it's the smallest adult scorpion I have, very thin and about 3,5 cm long. So the male needed only 6 months or so to reach maturity.
I don't know if they are especially communal. The other Uroplectes spp. I have, I always keep in adult couples for periods of months even, but U. pilosus did not seem to like eachother for more than a couple of days.