SPECIES DIVERSITY AND GEOGRAPHICAL DISTRIBUTION PATTERNS OF DREPANOSIPHIDAE IN CHINA

This paper describes the species diversity of Chinese Drepanosiphidae from the following three aspects: taxa diversity, host plants diversity, and geographical distribution diversity. Taxa diversity is expressed in levels of subfamilies, genera and species. Host plants diversity is expressed in terms of the number of host plants in different aphid groups. The Myzocallidinae had the greatest host plant diversity (14 plant families). Aphid diversity is expressed in terms of the number of aphid species feeding on the same host plants. The plant family Betulaceae is infested by 15 genera of aphids. In terms of geographical distribution, the Drepanosiphidae in China are mainly found in 4 subregions of the Palaearctic Region, and 3 subregions of the Oriental Region. Groups in the Palaearctic Region are distinctly predominant; in addition, species in North China are the most plentiful, relatively fewer species are found in the Northeast, Central China, South China and the Mongolia-Xinjiang subregions. The distribution patterns of genera are segregated into 12 categories, i.e. Chinese endemic distribution pattern, East Asian endemic distribution pattern, Palaearctic Region endemic distribution pattern, Oriental Region endemic distribution pattern, Holearctic region endemic distribution pattern, distribution pattern in Holearctic and Australian Regions, distribution pattern in Palaearctic and Oriental Regions, distribution pattern in Holearctic and Oriental Regions, distribution pattern in Holearctic and African Regions, distribution pattern in Palaearctic, Oriental and African Regions, distribution pattern in Oriental and Australian Regions, and distribution pattern in Oriental, African and Australian Regions. Among them the East Asian endemic distribution pattern is predominant, including up to 10 genera; the second is Holearctic distribution pattern, which have 7 genera; in the meantime, Chinese endemic groups are plentiful, which have 6 genera. On the whole, the species number of Chinese Drepanosiphidae is fewer and fewer from East to West, reaching fewest in Tibetan Plateau. Latitudinally, the species are centered in North China, from where dispersing both northward and southward, in Northeast, South China, and Central China the species numbers are fewer.