Thalassian

Thalassians are a mermaid-like species from the destroyed planet Thalassia.

Anatomy
Female Thalassians are tall, cyan colored humanoid aliens with sleek bodies, pink eyes, gills on their torsos, and long purple fins on their arms, hips, cheeks, head, eyebrows, shoulders, and on their legs or tail. It is unknown what the males look like.

Lifespan
Thalassians age much slow compared to Humans.

Powers and abilities
Thalassians natively breathe underwater and can survive the atmospheric pressure of depths beyond human capability. As such, they can swim and maneuver underwater excellently with their tail.

Thalassians possess a degree of enhanced strength, being able to use their tail offensively to smack things.

Thalassians may be able to freely switch between their tail or legs, on the day that they shed their scales.

Weaknesses
With exception of the days when they shed their scales, Thalassians constantly need to live in very deep water.

Despite their enhanced strength, Thalassians are physically weaker than Detrovites.

Culture and society
Female Thalassians routinely shed their scales, precisely once every 5.22 years. Upon shedding, they lose their tail and reveal two legs beneath it. Though they become capable of surviving outside of deep water and can even breathe in the air, this state only lasts for one day.

As a symbol of engagement, females accessorize with a Thalassian lip implant. This gold-colored crescent rests just below their bottom lip.