Wolf spider discovered on St Helena already endangered

St Helena in the South Atlantic has 505 species that exist nowhere else in the world. Photograph: Robert Ormerod/The Observer

Three new species of spider have been discovered on the island of St Helena, in the South Atlantic, prompting calls from scientists to quickly identify unknown invertebrates so they can be protected.

The wolf spiders bring the total number of species that exist nowhere else in the world except this remote island to 505.