贵州软滑水螨属二新种记述(蜱螨亚纲:软滑水螨科)

DESCRIPTION OF TWO NEW SPECIES OF PIONA FROM GUIZHOU PROVINCE (ACARI: PIONIDAE)

本文描述软滑水螨科Pionidae二新种。新种多盘软滑水螨Pipma polyacetabula sp.nov.以其两性具极多殖吸盘(雄螨68—72个,雌螨45—50个)为其显著特征。新种宽殖软滑水螨P.platyura sp.nov.两性殖吸盘数目较多(雄螨35—42个,雌螨约48个),两性殖吸盘板宽近与Ⅳ足基节板等宽。两新种间以雄性殖吸盘数差异显著;两新种亦以殖吸盘数与本属已知种有显著差异而易于鉴别。

Two new species of the genus Piona collected from Huaxi (26°2’ N, 106°6’ E), Guiyang, Guizhou Province, are described. All type specimens are deposited in the Department of Plant Protection, Guizhou Agricultural College.Piona polyacetabula sp. nov. (fig. 1 A-E and fig. 3 A-B)Length of body: ♂ 1016 μm, ♀ 1386 μm. length between anterior end of first coxae and posterior end of excretory pore 726 μm (♂) and of genital field 792 μm (♀). the number of genital acetabula on genital field (68-72 in mole and 45-50 in female, on each side), number of swimming hairs on all legs and structure of the palp set of the present species well apart from all other known species of the genus Piona.Holotype ♂, from a small pond (approximately 10m2) in Huaxi, Guiyang, Guizhou Province, 10. Ⅴ. 1988. Allotype ♀, same data as holotype. Paratypes 2♂♂, same data as holotype; 4♀♀, 5♂♂, 12.Ⅴ.1988 and 2♀♀, 1♂, 20. Ⅵ. 1988, same place as holotype but in river.Piona platyura sp. nov. (fig. 2 A-E and fig. 3 C-D)Length of body: ♂ 957 μm, ♀ 1419 μm. Length between anterior end of first coxae and posterior end of excretory pore 495 μm (♂), and of genital field 693 μm (♀). The genital acetabula of this species (♂ 35-42 and ♀ 48 on each side) are less than those of P. polyacetabula sp. nov., but likely more than those of other known species of Piona (most of known species are less than 30 genital acetabula). The genital field extending laterally well beyond the posterior corners of the fourth coxae in both male and female which differs from P. polyacetabula sp. nov., The two new species also differ from each other noticeably in the structure of the fourth coxae in both sexes, of Ⅳ-L-4 in nale and of palp in female.Holotype ♂, 12. Ⅴ. 1988, from a river in Huaxi, Guiyang, Guizhou Province. Allotype ♀, same data as holotype. Paratypes 2♂♂, same data as holotype; 1♂, 20. Ⅵ. 1988, same place as holotype.