An axolotl-headed cecaelia with an octopus lower body floats underwater, surrounded by coral and plants in a digital illustration.

Features of a Cecaelia (Sirena polypii): =biological= -humanoid upper body though proportionally thinner than humans' -thin octopus-tentacled lower body with 8 mobile tentacles, and one prehensile hectocotylus (analogous to a penis in other animals) -smaller than human-sized (90cm to 140cm) -long thin arms with long flexible tentacle-fingered hands -eyes larger than human proportionally -axolotl-like external gills located along the sides of the neck allowing for amphibious living -skin presents a uniform beige pigmentation comparable to humans', except at the arms, pointed ears, and from the waist down. Those differently-colored zones (refered to as the 'umidodermis') possess iridescent spots and are moist to the touch -hebdomadal estrous cycle with the peak in the weekend -highly flexible spine, allowing contortion impossible for a typical human, enabling them to coil, twist, or bend their torso in extreme ways -hair possesses an oily waxy coating similar to penguin feather's, and double as sensoceptors. hair coloration tends to match the hue of the umidodermis -skeleton composed of semi-hollow avianoïd bones. these serve as a compensatory lung with 8 hours of air inside. -average lifespan: 70–100 years in the wild, longer (90-130) in protected aquatic communities -pointy buccal fangs produce a mild anaesthesic venom -encephalization quotient of 7.75 -urination occurs by cloacally passing urate crystals See more