Ultratenuipalpus

Xu, Yun, Fan, Qing-Hai & Zhang, Zhi-Qiang, 2013, A new species of Ultratenuipalpus (Acari: Tenuipalpidae) from Cook Islands, with a key to the known species, Zootaxa 3731 (2), pp. 223-233 : 231-232

Key to adult females of Ultratenuipalpus

1. Venter with plates in genito-anal area, ovipore not surrounded by wrinkled or soft wavy cuticle; anal plate with 2 pairs of pseu- danal setae (ps 1 and ps 2); setae sc 1 more than twice as long as sc 2.......................... U. quadrisetosus (Lawrence)

- Venter without plates in genito-anal area, ovipore surrounded by wrinkled and soft wavy cuticle; anal plate with 3 pairs of pseudanal setae (ps 1, ps 2 and ps 3); setae sc 1 shorter than sc 2..................................................... 2

2. Hysterosoma with 4 pairs of dorsolateral setae; setae v 2 and sc 2 subequal........................... U. aberrans Collyer

- Hysterosoma with 5–6 pairs of dorsolateral setae; setae sc 2 more than 2 times as long as v 2. ........................... 3

3. Hysterosoma with 6 pairs of dorsolateral setae; seta f 2 present................................................... 4

- Hysterosoma with 5 pairs of dorsolateral setae; seta f 2 absent.................................................. 12

4. Palp tarsus with 3 setae; ventral setae 4a absent; setae v 2, sc 1 and sc 2 serrate and subequal.. U. gonianaensis Sadana & Sidhu *

- Palp tarsus with 2 setae; setae 4a present; setae v 2 and sc 1 setiform or spatulate, sc 2 broadly lanceolate and unequal......... 5

5. Setae d 3 lanceolate, equal to setae e 3, f 2 and f 3; genua I–IV with 2, 2, 0, 0 setae...................... U. pteriphilus Meyer

- Setae d 3 setiform or spatulate, minute; genua I–IV with 3, 3, 1, 0 or 2, 2, 1, 0 setae.................................. 6

6. Setae c 1, d 1 and e 1 setiform; pseudanal anal setae ps 1 and ps 2 subequal....................... U. younguisti Baker & Tuttle

- Setae c 1, d 1 and e 1 lanceolate; ps 2 flagelliform and more than twice as long as ps 1.................................... 7

7. Femora I–IV with 4, 4, 2, 0 setae; setae c 1 and d 1 subequal, e 1 about three quarters of c 1 in length........ U. meekeri De Leon

- Femora I–IV with 4, 4, 2, 2 or 4, 4, 2, 1setae; setae c 1, d 1 and e 1 subequal.......................................... 8

8. Femora I–IV with 4, 4, 2, 2 setae; genua I–IV with 2, 2, 1, 0 setae; dorsocentral setae c 1, d 1 and e 1 broadly lanceolate, width as long as length....................................................................... U. umtataensis Meyer

- Femora I–IV with 4, 4, 2, 1setae; genua I–IV with 3, 3, 1, 0 setae; c 1, d 1 and e 1 narrowly lanceolate, length about 3 times as long as width............................................................................................. 9

9. Tibiae I–IV with 4, 4, 3, 3 setae; setae e 3, f 2 and f 3 subequal.............................. U. lacorpuzrarosae Rimando

- Tibiae I–IV with 5, 5, 3, 3 setae; setae e 3 about 1.3 times as long as f 3, f 2 about 1.2 times as long as f 3................... 10

10. Palp tibia with 2 setae; dorsolateral setae f 3 and h 1 subequal.................................. U. baltazarae Rimando

- Palp tibia with 1 seta; dorsolateral setae f 3 about 1.3 times as long as h 1.......................................... 11

11. Setae v 2, sc 1 and d 3 subequal; c 3 more than 14 times as long as d 3................................. U. hainanensis Wang

- Setae sc 1 and d 3 subequal, about 1.5 times as long as v 2; c 3 about 3 times as long as d 3.................. U. filicicola Wang

12. Dorsocentral setae c 1, d 1 and e 1 lanceolate; setae h 1 about 1.5 times as long as f 3.................... U. asteliicola Collyer

- Setae c 1 and d 1 lanceolate or setiform, e 1 setiform; setae h 1 and f 3 subequal or setae h 1 about three quarters of f 3........... 13

13. Setae c 1, v 2, sc 1 and d 1 setiform.......................................................................... 14

- Setae c 1 lanceolate; v 2, sc 1 and d 1 setiform or lanceolate....................................................... 20

14. Setae sc 2 narrow, length more than 8 times as long as width; setae f 3, h 2 and h 1 narrow, length more than 4 times as long as width................................................................................................... 15

- Setae sc 2 broad, length less than 3 times as long as width; setae f 3, h 2 and h 1 broad, length less than 3 times as long as width…17

15. Palp tibia with 2 setae and tarsus with 3 setae; genua I–IV with 3, 2, 1, 0 setae..................... U. acharis Gonzalez

- Palp tibia with 1 or 2 setae and tarsus with 2 setae; genua I–IV with 3, 3, 1, 1 or 3, 3, 1, 0 setae....................... 16

16. Palp tibia with 2 setae; genua I–IV with 3, 3, 1, 0; seta c 3 about 1.2 times as long as seta vR on trochanter III.................................................................................................. U. charlini Gonzalez

- Palp tibia with 1 seta; genua I–IV with 3, 3, 1, 1; seta c 3 about four fifths of seta vR................... U. asteliae Collyer

17. Seta e 3 about twice as long as h 2 and h 1; palp tarsus with 2 setae................................. U. canelae Gonzalez

- Setae e 3, f 3, h 2 and h 1 subequal; palp tarsus with 3 setae....................................................... 18

18. Prodorsum and hysterosoma with reticulations mediodorsally and striae laterally......... U. womersleyi Pritchard & Baker

- Prodorsum and hysterosoma without reticulations........................................................... 19

19. Prodorsum smooth, divided into 5 regions; triangular body projections present anterior to setae h 2 and h 1, and a broadly trun- cated projection between setae h 1; seta sc 2 lanceolate............................................ U. avarua sp. nov.

- Prodorsum with some striations; hysterosoma round, without any projections; seta sc 2 broadly lanceolate................................................................................... U. arboreus Collyer

20. Setae v 2 and sc 1 setiform, d 1 lanceolate.................................................... U. coprosmae Collyer

- Setae v 2 or sc 1 lanceolate, d 1 lanceolate or setiform........................................................... 21

21. Setae sc 1, c 3 and d 3 broadly lanceolate, width as long as length.................................. U. nothofagi Collyer

- Setae sc 1 setiform; seta c 3 lanceolate and d 3 spatulate......................................................... 22

22. Setae e 3, f 3, h 2 and h 1 unequal, e 3 about 1.5 times as long as h 1, f 3 and h 2 subequal, about four fifths as long as e 3............................................................................................... U. carpodeti Collyer

- Setae e 3, f 3, h 2 and h 1 subequal........................................................................... 23

23. Setae v 2 and c 1 subequal; d 1 setiform; setae e 3, f 3, h 2 and h 1 lanceolate............................. U. cyathodis Collyer

- Setae v 2 more than 1.5 times as long as c 1; d 1 lanceolate; setae e 3, f 3, h 2 and h 1 broadly lanceolate............. 24

24. Setae v 2 as long as distance between base of v 2 and sc 1; sc 2 about twice as long as distance between bases of sc 1 and sc 2; setae c 1 and d 1 narrow, length more than 5 times as long as width, each seta extending beyond base of setae in next row..................................................................................................... U. rubi Collyer

- Setae v 2 half of distance between base of v 2 and sc 1; sc 2 as long as the distance between base of sc 1 and sc 2; setae c 1 and d 1 broad, length less than 3 times as long as width, each seta just reaching base of setae in next row.......... U. coprosmicus Collyer