High diversity of harvestmen in Atlantic Rainforest and ancient geological events
(PHYSorg.com Biology)

In the southern Atlantic Rainforest remnants between Rio de Janeiro State in Southeast Brazil and Santa Catarina State in South Brazil, there are some 600 species of harvestmen (Opiliones), arachnids that live in caves and humid forests. The number of species is considered high even for this well-known biodiversity hotspot, and most of these species are endemic.