Here's EVERYTHING to know about these seaturtles.

Finding them is simple, they spawn all around the oceans of the Island both in shallow and deep water, also they spawn with 3 jellyfish nearby most of the time, so be careful!

Taming is also very easy, bring a strong water creature, a crossbow (to kill the jellyfish) and bio toxin or exceptional kibble, once you find one you want to tame kill all dangerous creatures in the area, then feed the archelon until tamed.

Once tamed archelon will eat berrys, and can stay in the water or go on land.

Archelon are one of the most useful creatures in the ocean, they're saddle gives oxygen so you don't need scuba, and has 4 extra seats so your entire tribe can fit on one creature! They are also can't be stunned by jellyfish or eels, as well as the best bio toxin gathers in the game, and get a damage boost when they kill a jellyfish, but there's more, archelon will passively generate algae which can be used to tame herbivores at the same rate as mutton would on carnivores, or can be made into sushi which can recover lost taming effectiveness on any dino you're taming!

Overall, achelon is a great tame for ocean exploring, farming and taming. I hope this was helpful to anyone who was considering taming one of these guys.