"Key largo" is a sp. belonging to the Trichorhina genus that was collected in Florida. There are slight morphological and behavioral differences between "Key Largo" and tomentosa (common dwarf white). This species does play dead, but rather than curling into a "C" shape, they go flat and rigid. They burrow and behave the same in relation to cleaner behavior, however.
A 2oz culture has an estimated amount of 20-30 visible isopods.