中国上节缝甲螨类群的新纪录和滑缝甲螨属一新种(蜱螨亚纲:甲螨亚目)

NEW RECORDS OF ENARTHRONOTA FROM CHINA, WITH DESCRIPTION OF A NEW SPECIES OF LIOCHTHONIUS (ACARI: ORIBATIDA)

本文报道我国土壤甲螨的上节缝甲螨类群共计24种,其中包括22种中国新纪录和一个新种,洞滑缝甲螨Liochthonius lacunosus sp.nov.。文中对各种的国内分布及栖息环境也作了报道。

This paper reports 24 species of Enarthronota mites in China representing 15 genera in 7 families. Among them one species is described as new and 22 species are recorded for the first time from China.Liochthonius lacunosus sp. nov. (figs. 1-4)Colour Brownish yellow.Prodorsum Rostrum forming a forward projection. Setae le situated on a transverse ridge which running from the insertion of le to bothridium. A elliptic hollow located between setae in. Prodorsal setae lanceolatus, relative length of setae: ro>exa>le>in; relative length of setae interval: in-in>le-le>ro-ro. Sensillus with a bifurcated head, rather dense bristles on both margins.Notogaster Three large elliptic hollows on the medium of plate of Na; another three small rounded hollows laterally to median hollow. A S-shaped ridge on the corner of Na. Plate Nm and Py with a large hollow respectively. Lateral ridges on plate Py well developed, extended postriorly and connected each other by a transverse ridge. Notogastral setae lanceolatus, with clear midrib. Relative length of setae: e1>d1>f1>h1>c1; relative length of setae interval:e1-e1>f1- f1>d1-d1>c1-c1>h1-h1.Venter Epimerial formula. 3-1-3-4. Seven pairs of genital setae in two rows; adgenital plates with one pair of setae. Preanal plates with one pair, anal plates two pairs and adanal plates 3 pairs of setae, setae ad2 thicker and longer than ad1 and ad3.Holotype (W-89-86), Ⅶ. 30. 1989. Hubei Province (Hefeng, 29°N, 110°E), from broad-leaf tree litter. Paratype 1, collecting record same as for holotype. Type specimens mounted on slides and deposited in the Institute of Zoology, Academia Sinica.Discussion1. The new species is rather chitinized; dorsum with very destinct hollow-shaped struncture; rostrum projected forward; the ridges on plate Py forming a 'U'-shaped structure. By these charecters the new species can be easlly distinguished from all known species in the genus Liochthonius.1. Most species of Liochthonius are weakly chitinized, dorsal surface without sculpture or only with oval light spots, Howover, the sculpture of the new species is very conspicuous. According to the feature, the sculpture on dorsum can be divided into two typies: (1). Hollow-shaped structure: Six large hollows on the middle of prodorsum and notogaster, and three small rounded hollows on latetal plate Na. There is a brown, elevated border arounded the hollow and so it seems rather deep. The same struncture founded in L. kirghisicus Krivolutsky only one small hollow on plate Py. (2). Light spots; They located located on prodorsum and lateral part of plate Na and Py. The spots often found in genus Liochthonius and Eobrachychthonius without elevated border arounded the spot, and looks like a oval depression.3. In the new species there is no any suprapleural plate on pleural region. Setae c3 inserted on plate Na The area around lyrifissures im deep in colour, but it can not be recognized as a chitinized plate.The species new to China are:1. Eobrachychthonius oudemansi Hammen2. Brachychthonius zelawaiensis Sellnick3. Brachychihonius hungaricus Balogh4. Poecilockthonius spiciger (Berlese)5. Liochthonius intermedius Chinone et Acki6. Liochthonius sellnicki (Thor)7. Liochthonius asper Chinone8. Liochthonius kirghisicus Krivolutsky9. Liochthonius simplex (Forsslund)10. Liochthonius plumosus alius Chinone11. Synchthonius elegans Forsslund12. Mixockthonius concavus (Chinone)13. Hypochthonius rujulus Koch 14. Hypochihonius luteus Oudemans15. Eohypochthonius crassisetiger Aoki16. Eohypochthonius parvus Aoki17. lAalacoangelia remigera Berlese18. Sphaerochthonius splendidus (Berlese)19. Cosmochthonius reticulatus Grandjean20. Atopochthonius artiodactylus Grandjean21. Pterochthonius angelus (Berlese)22. Arborichthonius styosetosus Norton