The males and females are of a modest in size, reaching lengths of 60 mm or approximately 2.4 inches.

The telson is globular in shape, characteristic of the scorpions in the family Buthidae, but appears more swollen with short, small, and hooked aculeus (A. Karatas, 2012).

All legs have spurs that are prolateral and retro lateral, and all telotarsi have two rows of bristles ventrally and several setae dorsally.

The dactyl is small and blunt, while the ungues short, stout, and weakly curved (A. Karatas, 2012).

M. Vesiculatus is different than these three other species in that its median eyes are much larger, its vesicle and aculeus is smaller, and it has a stouter carination on its pedipalp.