It was also the last , and had what is considered to be the protoceratids ' strangest set of horns .
With a length of 2 m ( 6 ft 8 in ) , Synthetoceras was the largest member of its family .
Synthetoceras was also the last , and had what is considered to be the protoceratids ' strangest set of horns .
With a length of 2 m ( 6 ft 8 in ) , Synthetoceras was the largest member of its family .