The use of the term Dictyoptera has changed over the years, and while largely out of use for much of the last century, it is becoming more widely used. It has usually been considered a superorder, with Isoptera, Blattodea and Mantodea being its three orders. In some classifications, however, Dictyoptera is shifted to order status and in others the class Isoptera has been subsumed under Blattodea while retaining Dictyoptera as a superorder. Regardless, in all classifications the constituent groups are the same, just treated at different rank. Termites and cockroaches are very closely related, with ecological and molecular data pointing to a relationship with the cockroach genus Cryptocercus.
According to genetic evidence, the closest living relatives of the Dictyoptera are the phasmids and the enigmatic order Notoptera. If the Dictyoptera are considered a superorder these other orders might be included in it.
Evolutionary relationships based on Eggleton, Beccaloni & Inward 2007 and modified by Evangelista et al. 2019, are shown in the cladogram: The cockroach families Anaplectidae, Lamproblattidae, and Tryonicidae are not shown but are placed within the superfamily Blattoidea. The cockroach families Corydiidae and Ectobiidae were previously known as the Polyphagidae and Blattellidae. The cladogram also shows the family Alienopteridae (originally assigned to its own order "Alienoptera") as sister to Mantodea, but it was subsequently reassigned to the extinct Blattodea superfamily Umenocoleoidea by Vr?anský et al..
^Cameron, Stephen L.; Barker, Stephen C.; Whiting, Michael F. (January 2006). "Mitochondrial genomics and the new insect order Mantophasmatodea". Molecular Phylogenetics and Evolution. 38 (1): 274-279. doi:10.1016/j.ympev.2005.09.020. PMID16321547.
^Beccaloni, George W.; Eggleton, Paul (23 December 2011). "Order Blattodea Brunner von Wattenwyl, 1882. In: Zhang, Z.-Q. (Ed.) Animal biodiversity: An outline of higher-level classification and survey of taxonomic richness". Zootaxa. 3148 (1): 199-200. doi:10.11646/zootaxa.3148.1.37.
^Peter Vr?anský; Günter Bechly; Qingqing Zhang; Edmund A. Jarzembowski; Tomá? Mlynský; Lucia ?mídová; Peter Barna; Matú? Kúdela; Danil Aristov; Sonia Bigalk; Lars Krogmann; Liqin Li; Qi Zhang; Haichun Zhang; Sieghard Ellenberger; Patrick Müller; Carsten Gröhn; Fangyuan Xia; Kyoichiro Ueda; Peter V?a?ný; Daniel Vala?ka; Lucia Vr?anská; Bo Wang (2018). "Batesian insect-insect mimicry-related explosive radiation of ancient alienopterid cockroaches". Biologia. 73 (10): 987-1006. doi:10.2478/s11756-018-0117-3. S2CID52270212.