Genus Noctua is the scientific name for a group of small, nocturnal owls commonly called small earless owls or screech owls. Some synonyms for Genus Noctua include Otus, Megascops, and Asio. Otus is a genus of owls that includes both small and large species, while Megascops is a genus of screech owls found throughout the Americas. Asio, on the other hand, is a genus that includes several owl species, including the long-eared owl and the short-eared owl, both of which are found in North America. While each of these genera may include different species, they all share similar physical characteristics and behaviors with the Genus Noctua.