A review of the Chilean spider genus Olbus, with notes on the relationships of the Corinnidae (Arachnida, Araneae)

The Chilean spider genus Olbus is revised to include five species: Olbus sparassoides (Nicolet), and four new species, O. jaguar, O, nahuelbuta, O. eryngiophilus, and O. krypto. The genus is diagnosed by the presence of one apical thickened sera on the palpal tarsus. Differing from the subfamilies Corinninae, Castianeirinae and Trachelinae, the median apophysis is retained on the male palpal bulb, as occurs also in the corinnid genera landuba Bonaldo, Mandaneta Strand, Procopius Thorell and Pseudocorinna Simon. Olbus and these genera are placed in Corinnidae incertae sedis. A particular arrangement of enlarged cylindrical gland spigots, at least three on posterior median spinnerets, and two on posterior laterals, is proposed as a synapomorphy of Corinnidae. O. krypto, only known from a male with quite divergent characters, is placed provisionally in the genus.