The adult males of Maratus robinsoni and Maratus purcellae are approximately 2.5 mm in length and are the two smallest species known so far. The two largest species are Maratus sarahae and Maratus caeruleus, the males of both species reach about 5 mm. I have added an extra tab “Size” on this page where you can find examples of peacock spiders in relation to my finger, a pencil or a ruler