Megalodoras uranoscopus is the species...... Commonly refered to as Irwinni. I'm seeing max size of 24" and weight of 10lb on the interwb. IF these things didn't get so angry when moved I'd love to see how they stack up against those measurements cause I'm sure they have to be very close to that - I feel like weight might be heavier then 10lbs..... The tank they are in is 3' deep. I know I've taped my smaller ones at 18-19".