I'm trying to put together some documentation on the relation between the common (modern) horse and the okapi. I've found a tree that shows that connection but it has no references. I'm hoping that someone has documented this connection somehow.

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    $\begingroup$ Can you add a link to the tree? $\endgroup$ – kmm Jul 24 '14 at 14:26
  • $\begingroup$ Okapi is like a giraffe right... so you have to go back to a pretty basal ungulate. $\endgroup$ – Grady Player Jul 24 '14 at 17:45
  • $\begingroup$ I have started to recreate the tree image that I found in Google Docs as a Drawing. Here is the link: docs.google.com/drawings/d/… $\endgroup$ – randomblink Jul 25 '14 at 21:00

tolweb.org is your friend!

Because the okapi and the horse are not so closely related you will probably find several articles on the subject. Okapi belongs to the order of artiodactyla while the horse belongs to the order of perissodactyla. They are both mammals, eutheria, ungalata (superorder).

Here is the tree of the eutheria (within the mammals) from tolweb. You have approximatively 150 references. You can click on perissodactyla and artiodactyla and you will find 100 more references.

These two references may help you (I only read the titles)

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    $\begingroup$ My name is Casey and I approve of this message +1 $\endgroup$ – user1357 Jul 24 '14 at 17:45

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