Genus Periplaneta refers to a group of cockroach species belonging to the family Blattidae. Cockroaches are a common pest found in households and are known for their ability to survive in harsh conditions. The genus Periplaneta includes species such as the American cockroach, Australian cockroach, and Oriental cockroach. Synonyms for this genus include Diploptera, Pycnoscelus, and Blatta. While these species may have different physical characteristics and habitats, they all share similar traits such as being nocturnal, omnivorous, and able to transmit diseases to humans. Despite their pesky reputation, cockroaches are an important part of the ecosystem as they are a source of food for many animals.