Among the most well-known type are the American cockroach, Periplaneta americ
ana, which is about 30 mm (1 inch) lengthy, the German cockroach, Blattella germanica, about 15 mm (1/2 inch) lengthy, the Asian cockroach, Blattella asahinai, also about 15 mm (1/2 inch) in length, and the Oriental cockroach, Blatta orientalis, about 25 mm (3/4 inch). Humid cockroaches are often much bigger, and destroyed cockroach relatives such as the Carboniferous Archimylacris and the Permian Apthoroblattina were numerous times as large as these. Cockroaches are commonly considered vermins; however, only about 30 species (less than 1%) swarm urban habitats.
Cockroaches are most common in humid and subtropical climates. Some species are in close connection with individual dwellings and generally found around refuse or in the kitchen. Cockroaches are generally omnivorous with the exemption of the wood-eating genus Cryptocercus; these roaches are powerless of digesting cellulose themselves, but have symbiotic relationships with various protozoans and bacteria that digest the cellulose, allowing them to remove the nutrients. The resemblance of these symbionts to those in termites are such that the genus Cryptocercus has been believed to be more closely related to termites than to other cockroaches, and current research muscularly supports this hypothesis of relationships.
ana, which is about 30 mm (1 inch) lengthy, the German cockroach, Blattella germanica, about 15 mm (1/2 inch) lengthy, the Asian cockroach, Blattella asahinai, also about 15 mm (1/2 inch) in length, and the Oriental cockroach, Blatta orientalis, about 25 mm (3/4 inch). Humid cockroaches are often much bigger, and destroyed cockroach relatives such as the Carboniferous Archimylacris and the Permian Apthoroblattina were numerous times as large as these. Cockroaches are commonly considered vermins; however, only about 30 species (less than 1%) swarm urban habitats.Cockroaches are most common in humid and subtropical climates. Some species are in close connection with individual dwellings and generally found around refuse or in the kitchen. Cockroaches are generally omnivorous with the exemption of the wood-eating genus Cryptocercus; these roaches are powerless of digesting cellulose themselves, but have symbiotic relationships with various protozoans and bacteria that digest the cellulose, allowing them to remove the nutrients. The resemblance of these symbionts to those in termites are such that the genus Cryptocercus has been believed to be more closely related to termites than to other cockroaches, and current research muscularly supports this hypothesis of relationships.
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