A taxonomic study on the genus Tectodamaeus Aoki ( Acari , Oribatida , Damaeidae ) , with description of two new species from China

Two new species of the genus Tectodamaeus from Yunnan and Anhui Province respectively, China are described, Tectodamaeus daliensis sp. n., Tectodamaeus longus sp. n. Nine new combinations, Tectodamaeus costanotus (Wang & Norton) comb. n., Tectodamaeus exspinosus (Wang & Norton) comb. n., Tectodamaeus wulongensis (Wang & Cui) comb. n., Tectodamaeus brevisetus (Wang) comb. n., Tectodamaeus spiniger (Wang) comb. n., Tectodamaeus exsertus (Wang) comb. n., Tectodamaeus yaoi (Wang) comb. n., Tectodamaeus furcatus (Wang & Lu) comb. n., Tectodamaeus cuii (Wang & Lu) comb. n. are presented. Th e subgenus Damaeus (Tectodamaeus) as a genus in the oribatid mite family Damaeidae was reestablished. A key is given to distinguish all the species of the genus. Th e type specimens of the new species are deposited in the Institute of Entomology, Guizhou University (IEGU).


Introduction
Th e genus Tectodamaeus (Acari, Oribatida, Damaeidae), was established by Aoki (1984) for a single species, Tectodamaeus armatus Aoki, 1984, because there are only 2 setae on genu IV, while all the known genera of Damaeidae have 3~4 setae on the segment.In 1988, Enami and Aoki described the second species, Tectodamaeus striatus.In 1989, Wang and Norton described two species from South China, Damaeus exspinosus, Damaeus costanotus.Later, Wang and Hu (1992) described a new species Damaeus wulongensis.In 1994, Wang and Cui described another fi ve species, proposed two new combinations and Tectodamaeus was treated as a subgenus of Damaeus.
In this paper, the subgenus Damaeus (Tectodamaeus) as a genus in the oribatid mite family Damaeidae was reestablished.Two new species of Tectodamaeus from China are described and illustrated and nine new combinations present.A key to all known species of this genus is also provided.Th e type specimens of new species are deposited in the Institute of Entomology, Guizhou University, Guiyang, Guizhou (IEGU).
Remarks.Th e new species is similar to Tectodamaeus armatus Aoki, but is easily distinguished from the latter mainly by the setae of notogaster, roughened with dense warts and distal half fi nely barbed.Th e shape of sensilluse and tubercles (Sp, Da and Ba) and leg chaetotaxy are also diff erent.Th e new species is also similar to T. spiniger (Wang), but the former diff ers from the latter by diff erent notogastral setae.
Etymology.Th e species name is derived from the name of type locality.Integument.Yellowish-brown to reddish-brown in colour.Surface of body and basal part of leg segments except distal half of tarsi with rather thick cerotegument.Notogaster with triangular spinae adnatae and exuviae.Microtuberculate on all enantiophyses and apophyses, rostrum, lateral prodorsum and around leg acetabula.Noto-

Figures 18- 23 .
Figures 18-23.Tectodamaeus longus sp.n. 18 adult, dorsal view 19 adult, ventral view 20 femur and genu of leg I 21 tibia and tarsus of leg I 22 femur and genu of leg IV 23 tibia and tarsus of leg IV.