Blattodea or ‘true’ cockroaches are orthopteroids with incomplete metamorphosis. To date 4585 species of cockroaches have been named.
Ancestors of cockroaches go back some time, with cockroach-like species originating as far back as the Upper Carboniferous period some 315 million years ago.
Some physical characteristics of cockroaches include:
Cockroaches are more diverse in their reproductive biology than probably any other order of insects. For example, one species, Pycnoscelus surinamensis, is parthenogenic, which means they are able to reproduce without mating.