Eresus cinnaberinus
Eresus cinnaberinus and Eresus niger are names formerly used for a group of spiders in the genus "Eresus" now divided into three species, "E. kollari", "E. sandaliatus" and "E. moravicus". The three species differ in size, colour pattern, shape of prosoma and copulatory organs, and habitat, with no morphologically intermediate forms. As eastern and western "E. kollari" are genetically different, with the eastern form likely a hybrid between "pure" "E. kollari" and "E. moravicus", it is possible that later revisions will partition it into additional species. Both "Eresus cinnaberinus" and "Eresus niger" are now regarded as "nomina dubia