left|thumb|upright|alt=The giant northern termite is the most primitive living termite. Its body plan has been described as a cockroach's abdomen stuck to a termite's fore part. Its wings have the same form as roach wings, and like roaches, it lays its eggs in a case.|The external appearance of the giant northern termite Mastotermes darwiniensis is suggestive of the close relationship between termites and cockroaches.
left|thumb|upright|alt=The giant northern termite is the most primitive living termite. Its body plan has been described as a cockroach's abdomen stuck to a termite's fore part. Its wings have the same form as roach wings, and like roaches, it lays. its eggs in a case|The external appearance of the giant northern termite Mastotermes darwiniensis is suggestive of the close relationship between termites and cockroaches.