Permian brachiopods from the Selong Xishan section, Xizang (Tibet), China. Part 2: Palaeobiogeographical and palaeoecological implications, Spiriferida, Athyridida and Terebratulida. Geobios (Villeurbanne), 34(2), 30 juin 2001: 157-182. 173 [Zoological Record Volume 138]