These were large marine reptiles that looked like a cross between swordfish and dolphin breeds. The amount of discoveries we are making coming from the dinosaur age means they could have had diversity to the same extent of our modern day animal kingdom.
I've always felt that the very deepest parts of the ocean there may be lurking large dinosaur sized fish left from the period that managed to survive the impact of an asteroid because they were so far below.
Giant ichthyosaur is one of largest animals ever. The 205-million-year-old jaw bone of a prehistoric reptile belongs to 'one of the largest animals ever' say a group of international paleontologists. The new discovery has also solved a 150-year-old mystery of supposed 'dinosaur bones' from the UK. Source 7y.