Troglosironidae is a family of harvestmen with seventeen described species in a single genus, Troglosiro, which is found on the island of New Caledonia, in the Pacific Ocean.

They have laterally projecting ozophores, tarsal claws on the second pair of legs with a row of teeth, no opisthosomal median furrow, and a lamelliform adenostyle.

These gland pores form unique depressions in most species, except for those found on the northern half of the island.

[2] The spermatopositor of the males also exhibit a unique setation pattern, as well as enlarged moveable fingers with toothed margins.

The species Troglosiro platnicki and T. tillierorum (marked with *) were not used in the study, and their position in the phylogeny is speculative, though probable based on morphological similarities.