I started this topic to get some attention for dinosaurs, that I (as a start) and other players haven’t gathered any DNA of so far. (non-hybrids)
Tenontosaurus (never encountered, I know the area, where it should probably spawn, but I wasn’t lucky so far)
Erlikosaurus (encountered twice in about 65 days, first time I was at work and couldn’t go after it, second time it was gone before I could reach it)
Gallimimus (any idea, where it would spawn?)
Ornithomimus (same as Tenontosaurus)
Brachiosaurus (ok, probably Arena 8 and future special events?)
I wager, that there are more of you with similar circumstances.