The relations of microdrile faunae of inland-waters were analyzed mainly by means of clustering. In worldwide scale, the faunae of Britain, former Czechoslovakia, former Soviet Union, North America, China and Japan, all were chiefly parts of the ancient supercontinent Laurasia, are clustered together on the basis of the distribution data of the genera. However, the faunae of the regions mainly belonging to Gondwana, i.e. India, Africa, South America and Oceania, cannot be clustered into a group. The clustering of Chinese microdrile faunae reveals that there are some Holarctic taxa in Heilongjiang Basin and Xinjiang Uygur Autonomous Region, while those in Changjiang and Zhujiang Basins are more or less Oriental. A transition zone between south and north seems to be located in Huanghe Basin. Of the entire microdrile fauna, there are 1 genus and 14 species reported only from China.
Wang, Hongzhu; Liang, Yanling.Analyses of distribution and faunal relationship of inland-water microdrile Oligochaeta (Annelida) in the world and China,Acta Hydrobiologica Sinica,1997,21(SUPPL.):93-102