comma with apposition: the T. rex, the biggest known


Spain, spanish
In the following sentence I use the relative wich yo explain a characteristic of the animal, but if I want to say a characteristic of the second is correct to use a comma after the subject?

This dinosaur belongs to a group called the hadrosaurs, which are faster than the Tyrannosaurus rex, the biggest known carnivorous dinosaur.

  • Lexiphile

    Senior Member
    England English
    The comma is correct.
    This is another example of the question of the "essential" nature of the dependent clause. In your sentence, everything you wrote in blood-red can be left off and the sentence still makes perfect sense. So the clause is non-essential. Therefore it should have a comma before it.

    That is the most reliable test: does the sentence sound complete and correct if the dependent clause is omitted? If so, use a comma.