Aculus sorbariae, Song, Zi-Wei, Xue, Xiao-Feng & Hong, Xiao-Yue, 2009

Song, Zi-Wei, Xue, Xiao-Feng & Hong, Xiao-Yue, 2009, Six new species of Aculus Keifer from Tibet Autonomous Region, China (Acari: Eriophyoidea: Eriophyidae: Phyllocoptinae), Zootaxa 2305, pp. 1-23 : 10-13

Aculus sorbariae sp. nov.

( Figs 5 & 6 )

Description. FEMALE: (n = 8) Body fusiform, 238 (233–240), 67 (67–70) wide, 70 (70–72) thick; light yellow. Gnathosoma 20 (18–20), projecting obliquely down, pedipalp coxal seta (ep) 3 (3–4), dorsal pedipalp genual seta (d) 7 (6–7), cheliceral stylets 20 (18–20). Prodorsal shield pentagonal, 41 (41–42), 60 (60–62) wide; prodorsal shield with lobe rounded; shield with only thick admedian lines, a thick transverse line connected with admedian lines forming H shape, granules on center and lateral. Scapular tubercles on shield rear margin, 34 (31–34) apart, scapular setae (sc) 15 (13–15) projecting posteriorly. Coxal plates with short lines and granules; anterolateral setae on coxisternum I (1b) 10 (10–12), 13 (13–14) apart, proximal setae on coxisternum I (1a) 25 (20–25), 10 (9–10) apart, proximal setae on coxisternum II (2a) 50 (50–55), 26 (23–26) apart. Prosternal apodeme present. Legs with usual series of setae. Leg I 42 (42–44), femur 12 (11–12), basiventral femoral seta (bv) 10 (10–12); genu 5 (5–6), antaxial genual seta (l ʺ) 20 (20–22); tibia 9 (8–9), paraxial tibial seta (l ʹ) 6 (5–6), located 1/4 from dorsal base; tarsus 7 (7–8); paraxial fastigial tarsal seta (ft ʹ) 20 (18–20), antaxial fastigial tarsal setae (ft ʺ) 22 (20–22), paraxial unguinal tarsal seta (u ʹ) 5 (5–6); tarsal empodium 6 (6–7), simple, 4-rayed, tarsal solenidion 6 (5–6), knobbed. Leg II 40 (38–40), femur 10 (10–11), basiventral femoral seta (bv) 10 (10–11); genu 5 (5–6), antaxial genual seta (l ʺ) 7 (6–7); tibia 7 (6–7); tarsus 7 (7–8); paraxial fastigial tarsal seta (ft ʹ) 8 (8–10), antaxial fastigial tarsal setae (ft ʺ) 20 (20–22), paraxial unguinal tarsal seta (u ʹ) 5 (5–6); tarsal empodium 6 (6–7), simple, 4-rayed, tarsal solenidion 5 (5–6), knobbed. Opisthosoma dorsally with 20 (20–21) annuli, with elongated microtubercles on annular rear margins; ventrally with 69 (69–73) annuli, with round microtubercles. Setae c2 12 (12–15) on ventral annulus 12 (11– 12); setae d 45 (45–55) on ventral annulus 25 (25–26), 37 (35–37) apart; setae e 15 (10–16) on ventral annulus 44 (34–47), 22 (20–22) apart; setae f 25 (25–28) on 5th ventral annulus from rear, 25 (25–26) apart. Setae h1 3 (3–4), setae h2 54 (53–55). Female genital coverflap 14 (14–15), 23 (22–23) wide, smooth, setae 3a 20 (16–20), 19 (17–19) apart.

MALE: (n = 2) Body fusiform, 201–204, 57–60 wide, light yellow. Gnathosoma 20–21, projecting downwards, pedipalp coxal seta (ep) 3–4, dorsal pedipalp genual seta (d) 4–5, cheliceral stylets 18–20. Prodorsal shield pentagonal, 37–41, 49–50 wide; prodorsal shield with lobe rounded. Scapular tubercles on shield rear margin, 30–31 apart, scapular setae (sc) 12–15 projecting posteriorly. Coxal plates with short lines and granules; anterolateral setae on coxisternum I (1b) 8–10, 11–12 apart, proximal setae on coxisternum I (1a) 13–15, 7–8 apart, proximal setae on coxisternum II (2a) 28–30, 23–24 apart. Prosternal apodeme present. Legs with usual series of setae. Leg I 40 –42, femur 10–11, basiventral femoral seta (bv) 10–11; genu 5–6, antaxial genual seta (l ʺ) 17–20; tibia 7–8, paraxial tibial seta (l ʹ) 3–4, located 1/4 from dorsal base; tarsus 6–7; paraxial fastigial tarsal seta (ft ʹ) 18–20, antaxial fastigial tarsal setae (ft ʺ) 20–22, paraxial unguinal tarsal seta (u ʹ) 4–5; tarsal empodium 5–6, simple, 4-rayed, tarsal solenidion 5–6, knobbed. Leg II 36 –38, femur 9–10, basiventral femoral seta (bv) 9–10; genu 5–6, antaxial genual seta (l ʺ) 5–6; tibia 5–6; tarsus 6–7; paraxial fastigial tarsal seta (ft ʹ) 8–10, antaxial fastigial tarsal setae (ft ʺ) 20–22, paraxial unguinal tarsal seta (u ʹ) 4–5; tarsal empodium 5–6, simple, 4-rayed, tarsal solenidion 5–6, knobbed. Opisthosoma dorsally with 20–21 annuli, with elongated microtubercles; ventrally with 66–68 annuli, with round microtubercles. Setae c 2 14– 17 on ventral annulus 9–12; setae d 48–50 on ventral annulus 22–24, 30–32 apart; setae e 12–15 on ventral annulus 39–41, 18–21 apart; setae f 30–32 on 5th ventral annulus from rear, 21–23 apart. Setae h1 2–3, setae h2 50–52. Male genitalia 21–22 wide, setae 3a 18–20, 16–17 apart.

Type material. Holotype, female (slide No. NJAUAcariEri939, marked holotype), from Sorbaria sorbifolia (L.) A. Br. ( Rosaceae ), Pai town, Nyingchi (Linzhi) Prefecture, Tibet Autonomous Region, P. R. China, 15 August, 2007, coll. Zi-Wei Song, Xiao-Feng Xue & Zhen Wang. Paratypes, 7 females and 2 males (slides No. NJAUAcariEri939) with the same data as holotype.

Relation to host. Vagrant on leaf undersurface. No damage to the host was observed.

Etymology. The specific designation sorbariae is from the host genus name “ Sorbaria ”.

Differential diagnosis. This species is similar to A. persicae Xue & Hong, 2005 , but can be differentiated by the prodorsal shield with only thick admedian lines, a transverse line connected with admedian lines forming H shape, granules centrally and laterally (prodorsal shield with all lines complete, median and admedian lines connected with a transverse line at 1/4 from posterior in A. persica ); coxal plates with short lines and granules (coxal plates with only short lines in A. persica ); paraxial tibial seta (l') located 1/4 from dorsal base (paraxial tibial seta (l') located 1/3 from dorsal base).

Figures

FIGURE 5. Aculus sorbariae sp. nov. D, dorsal view of female; CG, coxae and genitalia of female; L 1, leg I; L 2, leg II.

FIGURE 6. Aculus sorbariae sp. nov. L, lateral view of female; em, empodium; CGM, coxae and genitalia of male; LO, enlarged lateral view of opisthosoma.