Aquila

Aquila is a mermaid appearing in series of Pirates of the Caribbean young reader books written by Rob Kidd for Disney.

Biography
"Our song will tear open your heart, and you will beg for more. It will tease you with your greatest desire till you grow mad. And this desire will eventually burn so fierce that you will drive yourself directly to us. Then it is our charge to deliver you to those to whom we answer."

- Morveren, Aquala and Aquila to Jack Sparrow

Aquila was a mermaid who encountered a young Jack Sparrow during his journey to find the Sword of Cortés. She had a blue tail, meaning she was a leader of the mermaids. She seemed more flirtatious towards Jack then the others. Aquila, Aquala, and Morveren also appeared to be sisters, Morveren being the oldest.