Among the best-known pest species are the American cockroach, Periplaneta americana, which is about 30 mm (1.2 in) long; the German cockroach, Blattella germanica, about 15 mm (0.59 in) long; the Asian cockroach, Blattella asahinai, also about 15 mm (0.59 in) in length; and the Oriental cockroach, Blatta orientalis, about 25 mm (0.98 in). Tropical cockroaches are often much bigger, and extinct cockroach relatives and 'roachoids' such as the Carboniferous Archimylacris and the PermianApthoroblattina were not as large as the biggest modern species
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Cockroachesare insects of the orderBlattariaorBlattodea, of which about 30 species out of 4,500 total are associated with human habitats. About four species are well known as pests.
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