To continue with the adamantoise discussion, I am inclined to think that is indeed a genus for the giant tortoise (as well as an animal).
My reasoning is that adamantoise shells drop from the Iron Tortoise and Bronze Tortoise found in Southern Thanalan. The item description also states that the giant tortoise are "...now living throughout Eorzea," yet we only see adamantoise in the South Shroud area. Ok, it's not conclusive evidence, but it's good enough for me!

I do find Lacovie an interesting tortoise, though. She is the matriarch of her giant tortoise family, coming to the aid of her fallen children... Maybe they are like elephants after all! Hehehehe...

I'm also about to amend and update the original post. Thanks to all the contributors and corrected-ers!

Merry Christmas and much love! <3

P.S. if Santa is reading this, please give me a ticket that grants me passage to explore the New World to the West... Or a map! I want to see the world!