Palpigradi: Systematics & Taxonomy

A few more than 100 species group taxa are divided among the families Eukoeneniidae (Allokoenenia, Eukoenenia, Koeneniodes, Leptokoenenia; altogether 90% of the species) and Prokoeneniidae (Prokoenenia, Triadokoenenia). While the families clearly differ in the presence of eversible vesicles on certain opisthosomal segments in Prokoeneniidae, there is still uncertainty as to the delimitation of genera. A recent phylogenetic analysis confirmed monophyly of Palpigradi and Eukoeneniidae.