Quote:Raen
Distribution:Â Yanxia (Doma), the Far East
Physical Attributes:Â The Au Ra are unique among Eorzea's races in the extreme height disparity observed between genders. While male Au Ra can reach towering heights of over eighty ilms, females are short and slight, averaging no more than sixty. Their hardened skin and scaled tails, too, distinguish them clearly from other races. They take great pride in the majestic horns on the sides of their head, which also serve to enhance their hearing and sense of spatial perception.
Xaela
Distrubution: The Azim Steppe
Physical Attributes:Â In contrast to the brilliant white scales of the Raen, the Xaela, children of the Dusk Mother, take pride in their scales of lustrous black. While their size and stature is almost identical to that of the Raen, their physical strength, hardened by generations of war and conflict, far outstrips that of other races.
-Page 091, Encyclopedia Eorzea
This is all I've currently found specifically about their scales or horns. There may be more, but I've been busy since I got back from FanFest, and I haven't been able to thoroughly pour over the book just yet. This is specifically listed under the section for Au Ra.