Wikipedia
Maratus is a spider genus of the family Salticidae ( jumping spiders). These spiders are commonly referred to as Peacock Spiders due to the males' colorful and usually iridescent patterns on the upper surface of the abdomen often enhanced with lateral flaps or bristles, which they display during courtship. Females lack these bright colors, being cryptic in appearance. In at least one species, Maratus vespertilio, the expansion of the flaps also occurs during ritualised contests between males. The male display and courtship dance are complex, involving visual and vibratory signals.
Several species in this genus were earlier classified in the genus Saitis, containing the Mediterranean Saitis barbipes, which is superficially similar to Maratus (colorful males with an enlarged third pair of legs). Saitis in Australia have enlarged and fringed third legs which they use for display but do not raise raise their abdomens like Maratus. All the species of Maratus accepted are found in Australia, with the exception of Maratus furvus from China. M. furvus was first described in 1992 in the genus Lycidas, becoming part of Maratus when Lycidas was synonymized in 2012. Otto and Hill consider that this species cannot be linked to any genus with certainty.
Jürgen Otto's 2011 video showing a male displaying for the first time was featured on the Australian ABC TV program Catalyst. By early 2016, Otto's YouTube video of the Peacock Spider Maratus speciosus displaying to a female had over 5.5 million views.