Olopachys (Olopachys)

Mojahed, Samaneh, Hajizadeh, Jalil, Hosseini, Reza & Ahadiyat, Ali, 2019, A new species of Olopachys Berlese (Acari: Pachylaelapidae) from Iran with a key to the world species, Acarologia 59 (1), pp. 46-56 : 50-54

Key to world species of the subgenus Olopachys (Olopachys) (females)

The key to the world species of the subgenus Olopachys (Olopachys) presented by Özbek (2016) is modified here to accommodate the new species from Iran. The specimens of Olopachys iraniensis n. sp., O. compositus Koroleva, 1976 and O caucasicus Koroleva, 1976 were examined, characteristics of other species were obtained from literature.

1. Tarsus II with one spur-like distal seta (pl1).......................................... 2

— Tarsus II with two spur-like distal setae (pl1 and pl2).................................. 3

2. Genitiventrianal shield with three pairs of setae (st5, JV1, JV2); metapodal sclerites small and rounded................................................... O. scutatus Berlese, 1910

— Genitiventrianal shield with five pairs of setae (st5, JV1, JV2, ZV2, ZV3); metapodal sclerites absent..................................................... O. latiscutus Koroleva, 1976

3. Postero-lateral margins of dorsal shield with one pair of gland pores (gdS4)............. 4

— Postero-lateral margin of dorsal shield with two pairs of gland pores (gdS4, gdZ1)....... 2

4. Tubes of sperm access system very long, helically arranged, and longer than distance between (paraxial margins of) coxae IV................................................ 5

— Tubes of sperm access system short, not helically arranged, and shorter than distance between (paraxial margins of) coxae IV........................................................ 6

5. Tubes of sperm access system with uniform shape over their length; dorsolateral and opisthogastric soft integument with 13 pairs of setae [six pairs of r. R. (r6, R 1, R 3, R 5−7)].................................................................. O. suecicus Sellnick, 1950

— Tubes of sperm access system with two regions of distinct thicknesses, the basal part (close to coxa IV) is thick and crescent-shaped and anterior part is slender and long; dorsolateral and opisthogastric soft integument with 14 pairs of setae [seven pairs of r. R. (r6, R 1, R 3−7)].................................................................. O. crescentu s Özbek, 2016

6. Dorsolateral and opisthogastric soft integument with 14 pairs of setae [seven pairs of r. R. (r6, R 1, R 3−7)]; ratio of length/width of genitiventrianal shield> 1.5 (1.54−1.69).............................................................. O. elongatus Özbek and Halliday, 2015

— Dorsolateral and opisthogastric soft integument with at most 13 pairs of setae; ratio of length/width of genitiventrianal shield <1.5............................................ 7

7. Dorsolateral and opisthogastric soft integument with at least 12 pairs of setae............ 8

— Dorsolateral and opisthogastric soft integument with at most 11 pairs of setae...........11

8. Soft integument with at least 13 pairs of marginal and opisthogastric setae............... 9

— Soft integument with 12 pairs of marginal and opisthogastric setae.................... 10

9. Tubes of sperm access system with a dark-brown part in apical, soft integument with six pairs of r. R. (r6, R 1, R 3– R 6) and seven pairs of opisthogastric (JV3–JV5, ZV1, ZV3–ZV5) setae............................................................ O. digitus Özbek, 2016

— Tubes of sperm access system without dark-brown part in apical, soft integument with eight pairs of r. R. (r6, R 1, R 3– R 8) and six pairs of opisthogastric (JV3– JV5, ZV2– ZV4) setae........................................................................ O. iraniensis n. sp.

10. Tubes of sperm access systems short, well sclerotized and with ductus well indicated and observable; gland pore gdS4 between setae Z2 and S4; pre-anal setae Jv2 connected by a straight line.......................................... O. ovatus Özbek and Halliday, 2015

— Tubes of sperm access systems longer, weakly sclerotized and with ductus inconspicuous, difficult to discern; gland pore gdS4 and setae S4 aligned transversally; pre-anal setae Jv2 not connected by a straight line....................................... O. vlastae Mašán, 2007

11. Soft integument with 11 pairs of marginal and opisthogastric setae; tubes of sperm access system thin and slightly curved............................. O. vysotskajae Koroleva, 1976

— Soft integument with 10 pairs of marginal and opisthogastric setae; tubes of sperm access system thick, strongly recurved, hook-shaped.......... O. prolixus Özbek and Halliday, 2015

12. Tubes of sperm access system very long, with several bends; length of dorsal shield 730-840 O. compositus Koroleva, 1976

— Tubes of sperm access system short or normal in length, without bends................ 13

13. Tubes of sperm access system thick and strongly sclerotized......................... 14

— Tubes of sperm access system thin and weakly sclerotized............................ 18

14. Metapodal plates fused with lateral margins of genitiventrianal shield................. 15

— Metapodal plates free............................................................. 16

15. Tubes of sperm access system short and uniform in width; genitiventrianal shield with about equal length and width................................ O. caucasicus Koroleva, 1976

— Tubes of sperm access system long and expanded apically; genitiventrianal shield longer than wide (length/width 1.12)................................... O. hallidayi Özbek, 2014

16. Tubes of sperm access system expanded apically.......... O. adsharicus Koroleva, 1976

— Tubes of sperm access system uniform in width..................................... 17

17. Tubes of sperm access system longer, apically reaching each other; sternal area between st2 and st3 with sculptural transverse line; lateral and opisthogastric integument with 11 pairs of setae................................................... O. kacheticus Koroleva, 1976

— Tubes of sperm access system shorter, apically not reaching each other; sternal area between st2 and st3 without sculptural transverse line; lateral and opisthogastric integument with 13 pairs of setae............................................... O. semicirculus Özbek, 2016

18. Dorsal setae shorter (J4 90–110); length of dorsal shield 650–730; geniti-ventrianal shield approximately subequal in length and width (length 0.34–0.39, width 0.33–0.36); tubes of sperm access system opening near coxae IV...................... O. annae Koroleva, 1976

— Dorsal setae longer (J4 120); geniti-ventrianal shield longer than wide (length 0.33–0.40, width 0.30–0.34); tubes of sperm access system opening between coxae III and IV........ 19

19. Genu and tibia of legs III and IV with small tubercles; tubes of sperm access system with broadened base............................................... O. golubevi Reitblatt, 1958

— Genu and tibia of legs III and IV without tubercles; tubes of sperm access system relatively thin in basal part................................................ O. sklari Koroleva, 1976

Key to species (females) of the genus Olopachys Berlese occurring in Iran

1. Tubes of sperm access system quite long, spiralled apically ( Figure 4A )..... O. compositus Koroleva, 1976

— Tubes of sperm access system short ( Figure 4B ) or normal in length, straight or moderately curved apically ( Figure 3B , 4C )........................................................ 2

2. Tubes of sperm access system much shorter than distance between (paraxial margins of) coxae IV, and uniform in widths, without bends ( Figure 4B ); metapodal plates fused with lateral margins of genitiventrianal shield..................... O. caucasicus Koroleva, 1976

— Tubes of sperm access system longer, approximately as long as distance between coxae IV, slightly tapered and strongly curved apically ( Figures 3B , 4C ); metapodal plates free.................................................................... Olopachys iraniensis n. sp.

Figures

Figure 3 Olopachys iraniensis n. sp. (female): A – Chelicera; B – sperm access system; C – tarsus II. Scale bar: 100 μm.

Figure 4 Tubes of the sperm access systems: A – Olopachysc ompositus; B – Olopachys caucasicus; C – Olopachys iraniensis n. sp. Scale bar: 50 μm.