Bestiary entry from the Clan Primer:
“Being the oldest living variety of plate wyrm, and thus thought to be the ancient dragon’s original form.
The petrified remain of long-extinct flora cling to its carapace, a testament to its incredible age. Though it favors dark, sandy caverns, the constantly swirling sand has withered away its sight. Because of this, its sense of touch has heightened to the point where it can sense the slightest movements in the air, thereby to find its prey and strike.”
Tips
The Archaeoaevis can be quite difficult to defeat, even at later stages of the game. Equip your party members with 
Ribbons and inflict 
Blind and 
Confuse on it to make the battle easier.
Drops
| Common - (40-55%) |  Battlewyrm Carapace |
| Uncommon - (25-40%) | Storm Crystal |
| Rare - (3-12%) | Leo Gem |
| Very Rare - (1-5%) |  Cameo Belt |
| With Monograph: | Emperor Scale |
| With Canopic Jar: | Arcana |
Percentages listed above are based on the chain level of the enemy killed. Check out the Grinding and Power Leveling page for more information.
Stolen
| Common - (55%) | Battlewyrm Carapace |
| Uncommon - (10%) | Teleport Stone |
| Rare - (3%) | Leo Gem |
Poached
| Common - (95%) | Battlewyrm Carapace |
| Uncommon - (5%) | Emperor Scale |