The most commonly mentioned long necked dinosaurs are the sauropods, which were usually huge and always quadrupedal and herbivorous. Other long necked dinosaurs included Therizinosaurs, Ornithomimids, and Troodontids.
Argentinosaurus was the biggest hervivorous dinosaur that has a long neck.
Plesiosaur
Janenschia is a dinosaur. It was a huge dinosaur with a long neck and tail.
The scientific name of a long neck dinosaur is Brachiosaurus.
Amargasaurus.
Bruhathkayosaurus
A long neck dinosaur that eats plants
grass and leaves
Diplodocus.
This depends on which long-necked dinosaur you are talking about. Heights varied between species.
mamenchasaurus
it has a long neck