Diptacus

Song, Zi-Wei, Xue, Xiao-Feng & Hong, Xiao-Yue, 2007, Description of seven new species in the genus Diptacus Keifer (Acari: Eriophyoidea: Diptilomiopidae: Diptilomiopinae) from northwestern China, Zootaxa 1429, pp. 39-53 : 40-41

Key to Diptacus species in China

1 Female genital coverflap smooth or with longitudinal ridges in one rank ...................................................2

- Female genital coverflap with longitudinal ridges in two uneven ranks ........................................................ ........................................................................................ Diptacus ipomoeae Huang, Hong & Huang, 1989

2 Coxal area entirely smooth ...........................................................................................................................3

- Coxal area with granules or short lines.......................................................................................................12

3 Prosternal apodeme present ..........................................................................................................................4

- Prosternal apodeme absent ....................................................................................... Diptacus abelis sp. nov.

4 Female genital coverflap smooth..................................................................................................................5

- Female genital coverflap with ridges or granules.........................................................................................8

5 Accessory setae h1 present ...........................................................................................................................6

- Accessory setae h1 absent.............................................................................................................................7

6 Dorsal opisthosomal annuli smooth but uneven, ventral opisthosomal annuli with triangular microtuber- cles ....................................................................................................................... Diptacus sorbusis sp. nov.

- Dorsal opisthosoma with shallow, longitudinal, subdorsal furrows, dorsal annuli with microtubercles few and weak, ventral annuli with small and round microtubercles. Diptacus gigantorhynchus ( Nalepa), 1892

7 Dorsal annuli smooth ............................................................ Diptacus guangxiensis Kuang & Hong, 1990a

- Dorsal annuli with microtubercles ...................................... Diptacus pseudocerasis Kuang & Hong, 1990b

8 Female genital coverflap with granules at base............................................................................................9

- Female genital coverflap with longitudinal ridges .....................................................................................10

9 Dorsal annuli smooth ............................................................................ Diptacus mume Liu & Kuang, 1998

- Dorsal annuli smooth centrally but with round microtubercles laterally........................................................ .................................................................................................... Diptacus gigantorubra Xin & Dong, 1983

10 Dorsal shield design with lines forming cell-like network ........................ Diptacus lonicerae Kuang, 2001

- Dorsal shield smooth ..................................................................................................................................11

11 Accessory setae h1 absent; each empodial branch six-rayed ....... Diptacus maackiae Kuang & Feng, 1987

- Accessory setae h1 present; each empodial branch seven-rayed ................ Diptacus tristylaus Huang, 2001

12 Prosternal apodeme present or coxal plates I separated .............................................................................13

- Prosternal apodeme absent..........................................................................................................................28

13 Female genital coverflap smooth................................................................................................................14

- Female genital coverflap with longitudinal ridges or granules...................................................................15

14 Dorsal annuli smooth ........................................................ Diptacus platyphyllae Xue, Song & Hong, 2006

- Dorsal annuli with elongated microtubercles .............. Diptacus luanchuanensis Xue, Song & Hong, 2006

15 Dorsal annuli smooth ..................................................................................................................................16

- Dorsal annuli with microtubercles..............................................................................................................25

16 Dorsal shield smooth ..................................................................................................................................17

- Dorsal shield with lines ..............................................................................................................................20

17 Coxal area I and II both with granules, prodorsal shield emarginate anteriorly, each empodial branch three-rayed ............................................................................................................. Diptacus wenisis sp. nov.

- Coxal area with short lines, prodorsal shield not emarginate anteriorly, empodial branches five-rayed or six-rayed .....................................................................................................................................................18

18 Female genital coverflap with short dashes at base, other parts smooth, frontal lobe long and acuminate ... ............................................................... Diptacus sacchari ( Xin & Dong), 1983; ( Hong and Zhang, 1997)

- Female genital coverflap with longitudinal ridges, frontal lobe short and broad.......................................19

19 Coxal area I with short lines but coxal area II with granules, each empodial branch six-rayed .................... ............................................................................................................ Diptacus camptothecae Kuang, 1995

- Coxal area I and II both with short lines, each empodial branch five-rayed .................................................. ............................................................................................... Diptacus liquidambaris Kuang & Feng, 1987

20 Female genital coverflap with granules at base, smooth distally ...............................................................21

- Female genital coverflap with longitudinal ridges, basally smooth ...........................................................22

21 Empodium with each branch nine-rayed, frontal lobe not emarginate anteriorly .......................................... .................................................................................................................... Diptacus kusanous Huang, 2001

- Empodium with each branch five-rayed, frontal lobe lightly emarginate anteriorly...................................... ..................................................................................................... Diptacus castaneae Kuang & Feng, 1987

22 Prodorsal shield designed with all lines degenerative, anterior edge of shield with an arcuate line, two arc- uate lines forming an ellipse in which have a “^” design between dorsal tubercles ...................................... .................................................................................. Diptacus liangfengjiangensis Chen, Wei & Qin, 2004

- Prodorsal shield not as above .....................................................................................................................23

23 Dorsal opisthosoma with a middorsal ridge anteriorly ending in a furrow caudally...................................... ............................................................................................................ Diptacus ulmi Kuang & Huang, 1991

- Dorsal opisthosoma evenly rounded...........................................................................................................24

24 Prodorsal shield design with admedian lines semicircular, incomplete ............. Diptacus rubi Kuang, 2001

- Prodorsal shield design with admedian complete and not semicircularly shaped.......................................... ......................................................................................................... Diptacus aceris Kuang & Hong, 1990b

25 Coxal area I with granules, coxal area II smooth, female genital coverflap with granules at base, smooth distally ............................................................................................................. Diptacus mercuriasis sp. nov.

- Coxal area I and II both with granules or short lines, female genital coverflap with longitudinal ridges..26

26 Coxal area with granules, each empodial branch three-rayed, dorsal opisthosoma evenly round ................. .......................................................................................................................... Diptacus zhouzhisis sp. nov.

- Coxal area with short lines, each empodial branch five-rayed, dorsal opisthosoma with a central furrow ... ....................................................................................................................................................................27

27 Prodorsal shield with median and admedian lines complete, dorsal annuli with elliptical microtubercles... ..................................................................................................... Diptacus betulae Chen, Wei & Qin, 2003

- Prodorsal shield with median and admedian lines incomplete, dorsal annuli with subulate microtubercles. ...................................................................................... Diptacus damingshanensis Chen, Wei & Qin, 2003

28 Coxal area I with granules but coxal area II smooth ..................................................................................29

- Coxal area I and II both with short lines ................................... Diptacus songxianensis Xue & Hong, 2005

29 Female genital coverflap with longitudinal ridges, smooth basally .................. Diptacus serrulatis sp. nov.

- Female genital coverflap with granules basally, smooth distally ...............................................................30

30 Dorsal shield with median line continuous and frontal lobe broad, dorsal annuli with elongated microtu- bercles, each empodial branch four-rayed ........................................................ Diptacus maddenis sp. nov.

- Dorsal shield with median line discontinuous and frontal lobe absent, dorsal annuli with spiny microtuber- cles, each empodial branch three-rayed ................................... Diptacus persicae Xue, Song & Hong, 2006