👉 Tetracilia is a species of fish that belongs to the family Pteropodidae, commonly known as "fish of the sea." They are primarily found in tropical and subtropical waters around the world. These fish are known for their distinctive patterned body, which includes a distinctive ring-like structure called a tetrachondria or "tetracilla," resembling a tetracycline. Tetracilia are also known for their ability to reproduce sexually through hatching