This illustration illustrates the diversity in morphologies present within the Archaea. Nanoarchaeum equitans (dark orange) can be seen living on its host, Ignicoccus hospitalis (light orange). Other represented archaeons include Pyrodictium abyssi (maroon), producing a network of long hollow tubules, called cannulae and Haloquadratum walsbyi (white) forming sheets of flat squares. The archaeons Sulfolobus acidocaldarius (orange), Methanococcus janischii (yellow), Methanothermus fervidus (orange rod shape), Methanobacterium thermoautotrophicum (light yellow, curved rod), Methanogenium frigidum (blue) are also represented. If you were able to examine the variety of archaeons in this image more closely, what key archaeal features might you expect to find? .