Why is it not acceptable to say that the mesosaurus could have traversed from one continent to another via the ocean?

It is not acceptable to say that the mesosaurus could have traversed from one continent to another via the ocean.  Although Mesosaurus is a reptile that could propel itself through water with its long hind legs and limber tail. There is no possibility that the Mesosaurus would have the ability to swim across such a large body of ocean because it was a coastal animal. 

Ifound this information on google “yes. they have a mouth and brain at one end and an anus at the opposite end. what characteristics distinguish an annelid from other worms? annelids have segmented bodies and a coelem which is a tube filled with fluid and contains most of the organs.“ i hope it you