The Oceosauroida mendo was an aquatic lifeform of the genus Oceosauroida, native to the planet Denkir IV. Subspecies of this species included the Oceosauroida mendo shinobu and the Oceosauroida mendo shutaro.
An illustration of this lifeform with its species name was seen on the chart "Evolution of Intelligent Life on Planet Denkir IV". (TNG: "The Child")
Its name appears to be a reference to Mendou Shuutarou, a main character in the anime Urusei Yatsura, which has been referenced a number of times.