The description of a new species of Anarthrotarsus Šilhavý from Greece and a discussion about the genus (Arachnida: Opiliones: Trogulidae)

Abstract: Anarthrotarsus trichasi sp. nov., a second species of the genus Anarthrotarsus Šilhavý, 1967 is described based on fresh material from the northeastern part of the island of Crete, Greece. The male holotype of the type species of the genus Anarthrotarsus was discovered on the island of Corfu, Ionian Islands, Greece, but no other conspecific specimens were found there ever since. This also holds true for the population from Crete, from where a female paratype was collected. Genital morphology of male specimens from both populations markedly differs, and that of the holotype from Corfu is even unique among Trogulidae. Though the tarsal formula (1-1-1-1 in the four walking legs) is identical in both populations, penis morphology, the main generic character of Anarthrotarsus, clearly separates them. A close relationship of A. trichasi sp. nov. with species of the genus Calathocratus Simon, 1879 is supposed but awaits molecular genetic affirmation.