KJAE_0910_13-37_f2.jpg141.9KB

 Many species of the phytoseiid mites are predaceous mites that occur on a wide range of plants in association with phytophagous mites and insect. The genus Typhlodromips is characterized by 17 pairs (j1, j3, j4, j5, j6, J2, J5, z2, z4, z5, Z1, Z4, Z5, s4, S2, S4, and S5) of setae on the dorsal shield of an adult female. Typhlodromips has macrosetae on the genu of legs I, II, III, and IV, furthermore, leg IV bears macrosetae on tibia and basitarsus. Seta Z5 shorter than, or approximately as long as distance between bases of Z5. Up to the present, ten species belonging to the genus Typhlodromips have been recorded from Korea (Ryu, 2007, 2012). In the present paper, a new species, Typhlodromips geumgangensis is described from this country, and a newly recorded Korean species, Typhlodromips paraki (Ehara, 1967) is redescribed, and key to the species of the genus Typhlodromips is provided. The setal nomenclature was based on that of Rowell et al. (1978). All measurements are given in micrometers. Length of dorsal shield is distance between bases of setae j1 and J5, width of that is distance between base of the seta s4.

 Key to the specie of the genus Typhlodromips (adult female)

1. Macroseta on basitarsus IV shorter than or as long as that
on genu IV ··································································· 2
- Macroseta on basitarsus IV longer than that on genu IV ··
······················································································ 3
2. Macroseta on basitarsus IV shorter than that on genu IV
····································································· T. mountus
- Macroseta on basitarsus IV as long as that on genu IV ··· 
········································································· T. arcus
3. Seta Z4 longer than distance between bases of Z4 and Z5
···················································································· 4
- Seta Z4 shorter than or as long as distance between bases
of Z4 and Z5 ································································ 5
4. Preanal pores between and behind the posterior preanal
setae (JV2) ························································ T. theae
- Preanal pores between the posterior preanal setae (JV2) ··
································································ T. rademacheri
5. Seta Z4 much shorter than distance between bases of Z4
and Z5 ········································································· 6
- Seta Z4 nearly as long as distance between bases of Z4 and
Z5 ·················································································· 8
6. Dorsal shield reticulate only along margins ··················
································································ T. okinawanus
- Dorsal shield wholly reticulate ····································· 7
7. Spermatheca with disc-shaped cervix ·········· T. quaesitus
- Spermatheca with V-shaped cervix ·················· T. paraki
8. Seta Z5 more than twice as long as Z4 ························· 9
- Seta Z5 less than twice as long as Z4 ··························· 11
9. Spermatheca with bell-shaped cervix ················ T. choii
- Spermatheca with distally widen, v-shaped cervix ······· 10
10. Fixed digit with 12-14 teeth ······················· T. tsugawai
- Fixed digit with 6-7 teeth ··········· T. geumganaensis n. sp.
11. Ventrianal pores just behind the posterior preanal setae
(JV2) ···························································· T. volgini
- Ventrianal pores between the posterior preanal setae (JV2)
·········································································· T. oguroi

1. Typhlodromips geumgangensis n. sp. 금강이리응애 (신칭) (Figs. 1-7)

Figs. 1-7. Typhlodromips geumgangensis n. sp.(♀). 1. Dorsum of idiosoma; 2. Sternal shield; 3. Posterior ventral surface; 4-5. Spermatheca; 6. Chelicera; 7. Basitarsus, tibia and genu of leg IV. (Scales: 1, 2, 3, 7 = 50 ㎛ ; 4, 5 = 10 ㎛ ; 6 = 20 ㎛).

 Female: Dorsal shield reticulate; 338 long, 165 wide; at least 9 pairs of small pores. Setae on dorsal shield: Z5 being longest, serrate; Z4 slightly longer than s4; j1 shorter than j3; remaining setae much shorter, smooth. Peritreme extending to j1; peritrematal shield fused anteriorly with dorsal shield. Sternal shield with posterior margin nearly straight, with 3 pairs of setae; 1 pair of metasternal platelets longer than wide. Ventrianal shield much longer than wide, wider than genital shield, with lateral margins slightly concave; 3 pairs of preanal satae; 1 pair of crescentric preanal pores between and behind 2 setae of JV2. 4 pairs of setae on integument surrounding ventrianal shield; seta JV5 smooth. 2 pairs of slender metapodal platelets, posterior pair much larger. Spermatheca as V-shaped. Fixed digit of chelicera 6-7 teeth, with pilus dentilis; movable digit with 3 teeth. Chaetotaxic formula; genu II, 2-2/0, 2/0-1; genu III, 1-2/1, 2/0-1. Leg IV with 3 macrosetae, genu, tibia, and basitarsus; macroseta on basitarsus longer than that on tibia and  genu. Lengths of setae (n=2, mean): j1 27.2, j3 40.0, j4 8.0, j5 8.0, j6 8.8, J2 9.2, J5 9.2, z2 31.2, z4 14.4, z5 8.0, Z1 10.0, Z4 54.4, Z5 126.0, s4 49.2, S2 12.0, S4 9.2, S5 8.4, r3 20.8, R1 12.0, JV5 48.4, macrosetae on leg IV; genu 51.2, tibia 44.4, basitarsus 72.0.

 Male: Not Known.

 Type series. Holotype: ♀, Geumgang Estuary-weir, Seongsan- myeon, Gunsan-si, Jeollabuk-do, 18. VIII. 1997, on Persicaria hydropiper (L.) Spach; Paratype: ♀, Geumgang Estuary-weir, Seongsan-myeon, Gunsan-si, Jeollabuk-do, 11. XI. 1996, on Persicaria hydropiper (L.) Spach. Type specimens of this species are deposited in the National Institute of Biological Resources, Korea.

 Etymology. The specific name is derived from the type locality, Geumgang Estuary-weir.

Remarks. The female of T. geumgangensis n. sp. resembles that of T. tsugawai (Ehara, 1959) from Japan in the setal lengths on the dorsal shield, but differs from the latter in having 6-7 teeth instead of 12-14 teeth on the cheliceral fixed digit and the cervix of the spermatheca much shorter and thicker. 

2. Typhlodromips paraki (Ehara, 1967) 명아주이리응애 (신칭) (Figs. 8-15)

Figs. 8-15. Typhlodromips paraki(♀). 8. Dorsum of idiosoma; 9. Sternal shield; 10. Posterior ventral surface; 11. Ventrianal shield; 12-13. Spermatheca; 14. Chelicera; 15. Basitarsus, tibia and genu of leg IV. (Scales: 8, 9, 10, 11, 15 = 50 ㎛; 12, 13 = 10 ㎛; 14 = 20 ㎛).

Amnlyseius (Amblyseius) paraki Ehara, 1967: p. 216, figs. 16-20; Ehara and Yokogawa 1977, p. 52, figs. 10-16. 

Neoseiulus paraki: Chant and McMurtry 2007, p. 29. 

Typhlodromips paraki: Ehara and Amano 2004, p. 9.  

Female: Dorsal shield reticulate; 364 long, 166 wide; at least 13 pairs of small pores. Setae on dorsal shield: Z5 being longest, barbs; Z4 slightly longer than s4; S2 as long as S4; S5 longer than z2. z4 and Z1; j1 shorter than j3; remaining setae much shorter, smooth. Peritreme extending to seta j1; peritrematal shield fused anteriorly with dorsal shield.. Sternal shield with posterior margin nearly straight, reticulate, with 3 pairs of setae; metasternal platelets longer than wide. Ventrianal shield much longer than wide, wider than genital shield, with lateral margins slightly concave; 3 pairs of preanal satae; 1 pair of crescentric preanal pores between and behind 2 setae of JV2. Setae JV5 smooth. 2 pairs of slender metapodal platelets, posterior pair much larger. Spermatheca with V-shaped cervix; atrium well develeped. Fixed digit of chelicera 7 teeth, with pilus dentilis; movable digit with unidentate. Chaetotaxic formula; genu II, 2-2/1, 2/0-1; genu III, 1-2/1, 2/0-1. Leg IV with 3 macrosetae, genu, tibia, and basitarsus; macroseta on basitarsus much longer than that on tibia and  genu. Lengths of setae (n=4, mean): j1 25.4, j3 35.8, j4 19.8, j5 19.8, j6 24.8, J2 27.8, J5 12.4, z2 31.2, z4 33.4, z5 19.8, Z1 31.8, Z4 46.8, Z5 74.2, s4 42.8, S2 40.8, S4 39.8, S5 37.8, r3 33.4, R1 32.0, JV5 47.2, macrosetae on leg IV; genu 41.0, tibia 44.2, basitarsus 80.0.

Male: Not Known. 

Distribution: Korea, Japan. 

Material examined: 1♀, 18. VIII. 1997, Chenopodium album var. centrorubrum Makino at Geumgang Estuary-weir, Ungpo-myeon, Gunsan-si, Jeollabuk-do; 2♀♀, 28. VIII. 1997, Chenopodium album var. centrorubrum Makino at Geumgang Estuary-weir, Napo-myeon, Gunsan-si, Jeollabuk-do; 1♀, 28. VIII. 1997, Lactuca indica var. laciniata (O. Kuntze) Hara at Geumgang Estuary-weir, Napo-myeon, Gunsan-si, Jeollabuk-do. 

Remarks. The adult of this species is characterized by spermatheca with V-shaped cervix and atrium well developed. 

Acknowledgements

This study was supported by the National Science Museum in Daejeon, Korea.