Of the 4,006 identified species of cockroaches, Australia has 428. I spotted this Northern Banded Cockroach (Cosmozosteria zonata)on Sweers Island, in the Gulf of Carpentaria. Definitely the most comely Blattodean I've ever seen. Australia has some of the world's smallest and largest, ranging from 3 to nearly 70 millimeters. The larger ones are sometimes mistaken for tortoises on the road.