New species and records of Oecobius Lucas, 1846 (Araneae: Oecobiidae) from Iran and Azerbaijan

New data on the oecobiid spiders of the genus Oecobius Lucas, 1846 occurring in Iran and Azerbaijan are provided. Five species are described as new to science: O. dariusi sp. n. (♀; Alborz and Tehran ‒ northern Iran), O. melanocephalus sp. n. (♀; Lorestan, Razavi Khorasan, Semnan, and Tehran ‒ south-western, northern and north-eastern Iran; hitherto described as the female of O. ferdowsii Mirshamsi, Zamani and Marusik, 2017), O. naxuanus sp. n. (♂; Nakhchivan ‒ western Azerbaijan), O. pasargadae sp. n. (♂♀; Fars ‒ south-central Iran), and O. zagros sp. n. (♂; Kermanshah ‒ western Iran). Furthermore, O. navus Blackwall, 1859 is reported in Iran for the first time, and new distribution records are provided for O. putus O. Pickard-Cambridge, 1876 and O. nadiae (Spassky, 1936).