软滑水螨属中国五新种暨老挝一新种(蜱螨亚纲: 湿螨总科: 软滑水螨科)

SIX NEW SPECIES OF Piona FROM CHINA AND LAOS WITH DESCRIPTION OF GLANDULARIA OF THE GENUS

本文记述软滑水螨属Ｐｉｏｎａ的中国５新种和老挝１新种：李氏软滑水螨Ｐ．ｌｉｓｐｎ．、成都软滑水螨Ｐ．ｃｈｅｎｇｄｕｅｎｓｉｓｓｐ．ｎ．、刺足软滑水螨Ｐ．ｓｐｉｎｉｐｏｄａｓｐ．ｎ．、簇瘤软滑水螨Ｐ．ｔｕｂｅｒｃｕｌｏｓａｓｐ．ｎ．、多突软滑水螨Ｐ．ｐａｐｉｌｏｓａｓｐ．ｎ．和异达氏软滑水螨Ｐ．ａｌｄａｄａｙｉｓｐ．ｎ．。本属为老挝水螨区系之新纪录。本文还简记了该属属征和腺毛分布特征。

Sixe new species of Piona (Pionidae) (five from China and one from Laos) are presented in this paper. This is the first report of the genus from Laos. The distribution of glandularia in the genus is defined based on comparative study of the species. It is suggested that the locations of D 2 and L 3 (on the dorso-lateral) and V 4 (on the dorsal of posterior end of idisoma) were the characteristics of the genus. A key to Chinese species (including one from Laos in the paper) was given. The differences between the new species and the relatives are as follows. Piona Lii sp. n., Fig. 1 This new species is similar to P. liberiensis Cook 1966, but differs from the latter by free anal pore and ventrally expended P-Ⅳ and large setal tubercles on the venter of P-Ⅳ. Piona chengduensis sp. n., Fig. 2 It is related to P. africana Viets 1916, but differs from the latter by separated PEG and heavy setae on Ⅳ-L-4 in male, much narrower median distance of PEG and much larger setal tubercles of P-Ⅳ in femal. Piona spinipdoda sp. n., Fig. 3 The new species is close to P. bromada Cook 1980. The separated PEG and free anal pore in the new species are the main characteristics to separate it from P. bromada, in which PEG are fused medially and anal pore fussed with genital plate. Piona tuberculosa sp. n., Fig. 4 This new species is similar to P. lii sp. n. and P. chenduensis sp. n., It is significantly different from these two species in dorsal structure, genital feuture and chaetotaxy of Ⅳ-L-4. Piona papilosa sp. n., Fig. 5 It seems related to the Indian species P. mahisa Cook 1967. However, the male's PEG is less fused medially (only 1/3 of EpⅣ) in the new species than the Indian species (EpⅣ fully fused), and the female's median distance of PEG is much wider than pregenital sclerite in the new species while the distance narrower than the sclerite in the latter. Piona allodadayi sp. n., Fig. 6 The present new species is from Laos. It is close to P. dadayi (Piersig, 1899), but differs from the latter by short P-Ⅱ, developed pregenital sclerite and long anchoral process.