 Work by Dodson ( 1975 ) recognized that there were many less taxa present in Alberta . Tetragonosaurus was found to be juveniles of Corythosaurus or Lambeosaurus . T. erectofrons was assigned to Corythosaurus based largely on biometric information . The only non @-@ typic specimen of Tetragonosaurus , assigned to T. erectofrons , was found later to be referable to Hypacrosaurus , although the holotype of the species was still found to be assignable to Corythosaurus . 
 Work by Dodson ( 1975 ) recognized that <a href='dey_it' title='1'><mark>there</mark></a> <a href='uninflect' title='2'><mark>were</mark></a> many less taxa present in Alberta . Tetragonosaurus was found to be juveniles of Corythosaurus or Lambeosaurus . T. erectofrons was assigned to Corythosaurus based largely on biometric information . The only non @-@ typic specimen of Tetragonosaurus , assigned to T. erectofrons , was found later to be referable to Hypacrosaurus , although the holotype of the species was still found to be assignable to Corythosaurus . 
Work by Dodson ( 1975 ) recognized that it was many less taxa present in Alberta . Tetragonosaurus was found to b juveniles of Corythosaurus or Lambeosaurus . T. erectofrons was assigned to Corythosaurus based largely on biometric information . The only non @-@ typic specimen of Tetragonosaurus , assigned to T. erectofrons , was found later to be referable to Hypacrosaurus , although da holotype of the species was still found to be assignable to Corythosaurus .