First Mesozoic mygalomorph spiders from the Lower Cretaceous of Siberia and Mongolia, with notes on the system and evolution of the infraorder Mygalomorphae (Chelicerata: Araneae). Neues Jahrbuch fuer Geologie und Palaeontologie Abhandlungen, 178(3) 1990: 325-368. 330 [Zoological Record Volume 126]