The tree trunk spiders are members of the tropical and semi-tropical family Hersiliidae. There are about 150 species in this family. These spiders have two very prominent spinnerets that are almost as long as their abdomen. So they are also sometimes known as "two-tailed spiders".

Top: Andasibe-Mantadia National Park, Madagascar, 10 January 2014
Left: Mananara Lodge area, Anjozorobe, Madagascar, 17 January 2014