Super easy to get these on genesis. Just slither around the arctic on a basilisk, give it a bite or two while it's circling you to KO, then feed a rare flower. If you can't find any flowers in the bushes it's easy to just buy one from the HLNA shop.
They're super cute! They may be hard to find as they're small and blend in well with the redwood forest. I recommend riding a dino and when you get attacked whistle passive tame so your dino doesn't kill it. Then when you become conscious again bola it and use tranq arrows. Definitely use mushrooms or flowers as it's a super fast tame! They're great for defense as they can knock people off their dinos.
I hear on standard servers it only takes 1 rare flower to tame a 150. I can confirm it does at 2.5 (5x old rates) rates at least. Also they look almost identical to Archas almost, especially at a distance or while mounted.