Rank A Marks take about 3-6 hours to respawn after being killed. Unlike S Marks, they do not have spawn triggers.
Alectryon | Western Thanalan
Cornu | Outer La Noscea
Dalvag's Final Flame | Northern Thanalan
Forneus | Central Shroud
Ghede Ti Malice | South Shroud
Girtab | North Shroud
Hellsclaw | Eastern La Noscea
Kurrea | Mor Dhona
Maahes | Eastern Thanalan
Marberry | Upper La Noscea
Marraco | Coerthas Central Highlands
Melt | East Shroud
Nahn | Western La Noscea
Sabotender Bailarina | Central Thanalan
Unktehi | Lower La Noscea
Vogaal Ja | Middle La Noscea
Zanig'oh | Southern Thanalan