Lead author Dr Romain Sabroux from the University of Bristol's School of Earth Sciences, said: "Sea spiders (Pycnogonida), are a group of marine animals that is overall very poorly studied.

The doubtfully-related Pycnogonida and Tardigrada are omitted, but the Linguatulid are included. There is no mention of Limulus. Thus the book is, in effect, the third ‘biology of spiders’ to ...