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There are a couple problems with your question seeing as swimming dinosaurs didn't exist, and I'm not sure what you mean by gigantic world, but I will do my best to answer it. The largest aquatic reptile from the time of the dinosaurs was a carnivirous pliosaur 15m long. It is unamed. The largest ocean going creature at the time was Leedsichthys, a massive fish 27m long.
What else can I help you with?
What was the biggest dinosaur that ever walked on the earth?
The argentinosauraus is the biggest and longest.
Biggest dinosaur museum on earth?
George is related to Kane
Was the t rex the biggest dinosaur ever to walk the earth?
no
Why was the megalodon king of the ocean?
Because it was the biggest fish/dinosaur to be on the planet earth, and cause it was the most terrifying and fierce on the earth.
What was the biggest flesh eating dinosaur?
Spinosaurus is the biggest flesh eating dinosaur.
What is the biggest dinosaur what is the biggest dinosaur?
Bruhathkayosaurus ?44 m 144 ftTitanosaur
What was the biggest earthquake struck on earth?
it probably happened during dinosaur periods when the continents split apart
Where were the world's biggest find forty dinosaur skeletons found in Canada.?
in jupiter where mars and pluto is and earth
Was T-Rex the biggest dinosaur ever?
No. The biggest dinosaur would be the titanosaur argentinosaur huinculensis.
What was the biggest dinosaur in the Jurassic?
The biggest dinosaur in the Jurassic period were the gigantic sauropods like the famous Diplodocus.
What is the name of the biggest hervivorous dinosaur and has a long neck?
Argentinosaurus was the biggest hervivorous dinosaur that has a long neck.
What is the biggest dinosaur tooth?
The single biggest tooth? Or the genus of dinosaur that would likely have had the biggest teeth? If the latter, probably Carcharodontosaurus or Giganotosaurus.
