It's an otter, with less capacity :

Both can be used as AC, but this piece of s...t can't do anything else ;

Plus, it got the same turn radius of titanic, once it sunk (you want to take both your dimetrodons to the same place, to make the incubation easier, or to breed them, it would take almost forever, just because they doesn't turn)

Really useless, compared to the otter, specially considering the difficulty to tame it, and bring it to your base