Dactyloscirus, Berlese, 1916

Corpuz-Raros, Leonila A., Naredo, Jeremy C. B., Lit, Ireneo L. & Caasi-Lit, Merdelyn T., 2022, Two new species of the genus Dactyloscirus (Acari: Prostigmata: Bdelloidea Cunaxidae) from Sumatra, Indonesia, with a key to known species, Zootaxa 5214 (1), pp. 89-103 : 100-102

Key to species of Dactyloscirus

(Females)

1. Pedipalp with apophysis on joint of genu and tibiotarsus or arising distally on inner surface of genu................... 2

– Pedipalp without apophysis on joint of genu and tibiotarsus nor on genu......................................... 25

2. Hysterosoma with four pairs of median dorsal platelets.......... D. multiscutus Rocha, Rodrigues and Ferla, 2015 ( Brazil)

– Hysterosoma either with a single median dorsal shield or entirely soft, without platelets or shields..................... 3

3. Hysterosoma with single median dorsal shield.............................................................. 4

– Hysterosoma without median dorsal shield................................................................ 10

– Hysterosoma without dorsolateral shields.................................................................. 7

5. Median dorsal hysterosomal shield with two pairs of setae (c, d); basifemora I – IV with 5-5-3-1 setae.................. 1 1 .......................................................... D. philippinensis Corpuz-Raros, 1995 ( Philippines)

– Median dorsal hysterosomal shield with three pairs of setae (c 1, d 1 and e 1); basifemora I–IV with 5-5-3-2 setae........... 6

6. Apophysis on joint of pedipalpal genu and tibiotarsus long and pointed, that on telofemur short and spoon-shaped................................................................................. D. mesonotus Shiba, 1986 ( Japan)

– Apophysis on joint of pedipalpal genu and tibiotarsus long and blunt-tipped, that on telofemur long and blunt apically.......................................................... D. pseudophilippinensis Skvarla and Dowling, 2012 ( USA)

7. Apophysis on joint of pedipalpal genu and tibiotarsus attenuate and pointed...................................... 8

– Apophysis on joint of pedipalpal genu and tibiotarsus bulbous................................................. 9

8. Median hysterosomal shield with three pairs of setae (c 1, d 1 and e 1); seta c 2 arising on soft cuticle outside median shield............................................................................ D. johnstoni Smiley, 1992 ( Mexico)

– Median hysterosomal shield with four pairs of setae (c 1, c 2, d 1 and e 1); seta c 2 arising on median shield.............................................................................. D. illutus Inayatullah and Shahid, 1996 ( Pakistan)

9. Median hysterosomal shield with two pairs of setae (c 1 and d 1); pedipalpal telofemur with a bulbous apophysis......................................................................... D. mansoni Smiley, 1992 ( Mexico; Philippines)

– Median hysterosomal shield with three pairs of setae (c 1, d 1 and e 1); pedipalpal telofemur without apophysis.................................................................................. D. pataliputraensis Gupta, 1981 ( India)

10. Hysterosoma with a pair of lateral shields................................................................ 11

– Hysterosoma without lateral shields..................................................................... 22

11. Coxa II with two setae................................................ D. poppi Smiley, 1992 (unknown locality) *

– Coxa II with three setae............................................................................... 12

12. Pedipalpal telofemur with two apophyses, one narrowly bulbous and other disc-shaped.............................................................................................. D. condylus Den Heyer, 1979 ( South Africa)

– Pedipalpal telofemur with only one broadly bulbous apophysis................................................ 13

13. Coxa IV with one or two setae......................................................................... 14

– Coxa IV with three setae.............................................................................. 16

14. Coxa IV with one seta; tibia I with two attenuate solenidia............... D. imbecillus Bashir and Afzal, 2006 ( Pakistan)

– Coxa IV with two setae; tibia I with one attenuate solenidion................................................. 15

15. Dorsomedian hysterosomal seta f 1 shorter than h 1; palp genu with two sts... D. manzoori Bashir and Afzal, 2006 ( Pakistan) – Dorsomedian hysterosomal seta f 1 longer than h 1; palp genu with three sts.. D. kahrorensis Bashir and Afzal, 2006 ( Pakistan)

16. Pedipalpal tibiotarsus thick, almost straight and gradually tapered distally; apophysis on joint of pedipalpal genu and tibiotarsus small and narrowly bulbous............................................................................ 17

– Pedipalpal tibiotarsus thin, curved, and abruptly tapered from near base; apophysis on joint of pedipalpal genu and tibiotarsus large and apically pointed or bulbous.................................................................... 18

17. Basifemur IV with two sts; tibiae I-IV with 5-5-5-4 sts; setae g 4 longest of the genital setae....................................................................... D. ladangjagung Corpuz-Raros and Lit sp. nov. ( Indonesia: Sumatra)

– Basifemur IV with one sts; tibiae I-IV with 4-5-4-2 sts; setae g 3 longest of the genital setae.................................................................................................. D hoffmannae Swift, 1996 (Hawaii)

18. Lateral hysterosomal shields small, less than twice as long as either setae c or c ................................... 1 2 ........................................................... D. inermis ( Tragardh, 1905) ( Egypt; cosmopolitan)

– Lateral hysterosomal shields long, more than twice as long as either setae c 1 or c 2 ................................. 19

19. Hysterosomal seta h 1 1.25 times longer than f 1.................................... D. humuli Liang, 1986 (NE China)

– Hysterosomal setae f 1 and h 1 equal in length............................................................... 20

20. Genital seta g 3 longest, 1.5 – 1.7 times the length of g 2 and g 4, and more than twice g1 ...... D. smileyi Swift, 1996 (Hawaii)

– Genital seta g 4 longest of the genital setae................................................................ 21

– Chelicera stout, basal half inflated to four times its distal width; length of lateral hysterosomal shields only 2/3 of setal distance c 1 –c 2; hysterosomal setae f 1 and h 1 2.25 times as long as setae c 1 –e 1 ................................................................................................ D. sumatranus Corpuz-Raros and Naredo sp. nov. ( Indonesia)

22. Apophysis on joint of pedipalpal genu and tibiotarsus long and gradually tapered to a fine point................................................................... D. machairodus ( Oudemans, 1922) ( Indonesia: Sumatra, Philippines)

– Apophysis on joint of pedipalpal genu and tibiotarsus short and bulbous........................................ 23

23. Pedipalpal genu with two apophyses, one bulbous and the other disc-like. D. discocondylus Corpuz-Raros, 2008 ( Philippines)

– Pedipalpal genu with one bulbous apophysis.............................................................. 24

24. Basal pair of adoral setae very long, more than four times the length of distal pair; apophysis of pedipalpal telofemur about as long as width of this segment; genital seta g 4 twice as long as setae g 1 –g 3 .... D. rosarioae Corpuz-Raros, 1995 ( Philippines)

– Basal pair of adoral setae not elongated, subequal to distal pair; apophysis of pedipalpal telofemur short, less than width of this segment; genital setae g 4 slightly longer than setae g 1 –g 3 .................. D. agricolus Corpuz-Raros, 1995 ( Philippines)

25. Median dorsal hysterosomal shield present................................................................ 26

– Median dorsal hysterosomal shield absent................................................................ 27

26. Dorsal hysterosomal shield bear three pairs of setae (c, d and e)............................................... 1 1 1 ............................................... D. eupaloides Berlese, 1916 ( Argentina, North America, Europe) 1 2 1 1

– Dorsal hysterosomal shield bear four pairs of setae (c, c, d, and e)..... D. minys Inayatullah and Shahid, 1996 ( Pakistan)

27. Pedipalpal claw trifid; setal formula of coxae II–IV 3-3-3.................. D. trifidus Corpuz-Raros, 2008 ( Philippines)

– Pedipalpal claw entire, unbranched; setal formula of coxae II–IV not as above................................... 28

28. Coxa I with two setae..................................................... D. bengalensis Gupta, 1992 ( India)

– Coxa I with three setae............................................................................... 29

29. Coxal II–IV setal formula 1-3-2.................................... D. orsi Inayatullah and Shahid, 1996 ( Pakistan)

– Coxal II–IV setal formula 2-3-1.............................. D. saopauloensis Den Heyer and Castro, 2012 ( Brazil)