The Dinosaur Alphabet: O

I think you all know these four Now let me see which genera would you like to see for 'P'!

From top to bottom:
-Oviraptor philoceratops (on the left)
-Ornitholestes hermanni (on the right)
-Ouranosaurus nigeriensis (on the left)
-Olorotitan arharensis (on the right)

Full ranking of the votes taken for this letter from deviantart and facebook:
1° Oviraptor - 23 votes (illustrated)
2° Ouranosaurus - 20 votes (illustrated)
3° Olorotitan - 16 votes (illustrated)
4° Ornitholestes - 15 votes (illustrated)
5° Oxalaia - 12 votes
6° Omeisaurus - 11 votes
7° Orkoraptor - 9 votes
8° Ostafrikasaurus - 8 votes
9° Othnielia - 7 votes
10°Oryctodromeus, Ozraptor, Ornithomimus - 6 votes
11°Ojoceratops - 5 votes
12°Orodromeus - 4 votes
13°Opisthocoelicaudia - 3 votes
14°Ojoraptorsaurus, Ohmdenosaurus, Ornatotholus - 2 votes
15°Osmakasaurus, Owenodon, Ornithodesmus - 1 vote

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Update: Yes, I was wrong again on writing correctly the species name. It's arharensis, not "ararhensis". I'm a perfectionist and I love studying latin but I'm also a distracted person so try to get me  At least, this time I realized it alone.