Rhyncaphytoptus yilisis, Song, Zi-Wei, Xue, Xiao-Feng & Hong, Xiao-Yue, 2007

Song, Zi-Wei, Xue, Xiao-Feng & Hong, Xiao-Yue, 2007, Four new species and a new name in the genus Rhyncaphytoptus Keifer (Acari: Eriophyoidea: Diptilomiopidae) from China, Zootaxa 1520, pp. 57-68 : 65-67

Rhyncaphytoptus yilisis sp. nov.

( Fig. 4 )

Description. Female: (n = 10) Body fusiform, 317 (309–330), 88 (88–92) wide, 80 (80–84) thick; light yellow. Gnathosoma 70 (70–73), projecting downwards, pedipalp coxal setae (ep) 4 (4–5), dorsal pedipalp genual setae (d) 12 (10–13). Chelicerae 68 (68–70), oral stylets 70 (70–73). Prodorsal shield 44 (43–44), 75 (74– 76) wide; with wide and broad frontal lobe; prodorsal shield design of incomplete median, submedian and complete admedian lines; admedian lines sinuous at 1/2 anterior and ending with a semicircle line. Scapular tubercles on rear margin, 42 (38–42) apart, scapular setae (sc) 27 (25–28) projecting forward. Coxal area smooth; anterolateral setae on coxisternum I (1b) 10 (10–13), proximal setae on coxisternum I (1a) 22 (20– 30), proximal setae on coxisternum II (2a) 55 (50–60). Prosternal apodeme present. Legs I 68 (66–68), femur 15 (14–15), basiventral femoral setae (bv) 23 (23–25); genu 8 (7–8), antaxial genual setae (l’’) 36 (36–40); tibia 15 (14–15), paraxial tibial setae (l’) 14 (14–15), setae located 1/3 from dorsal base; tarsus 11 (10–11), tarsal setae (u’) 5 (4–5), tarsal empodium simple, 6-rayed, tarsal solenidion knobbed. Legs II 66 (64–66), femur 13 (12–13), basiventral femoral setae (bv) 21 (21–23); genu 7 (7–8), antaxial genual setae (l’’) 15 (15– 17); tibia 13 (11–13); tarsus 11 (10–11), tarsal setae (u’) 5 (4–5), tarsal empodium simple, 6-rayed, tarsal solenidion knobbed. Opisthosoma: dorsal opisthosoma with 26 (26–28) annuli, with central fissures and last seven annuli with triangular microtubercles ahead of annular margins; ventrally with 97 (90–98) annuli, with triangular microtubercles. Setae c2 20 (18–20) on ventral annulus 21 (18–22); setae d 45 (45–60) on ventral annulus 46 (40–47); setae e 18 (17–20) on ventral annulus 65 (57–68); setae f 32 (32–50) on 6th ventral annulus from rear. Setae h1 6 (5–6). Female genitalia 23 (23–28), 42 (40–42) wide, coverflap without longitudinal ridges, but with granules at base, proximal setae on coxisternum III (3a) 18 (18–20).

MALE: (n = 2) Body fusiform, 280–290, 76–80 wide, light yellow. Gnathosoma 65–70, projecting downwards, pedipalp coxal setae (ep) 3–4, dorsal pedipalp genual setae (d) 10–12. Chelicerae 60–64, oral stylets 65–70. Prodorsal shield 40–42, 63–65 wide; with wide and broad frontal lobe. Scapular tubercles on rear margin, 35–37 apart, scapular setae (sc) 25–28 projecting forward. Coxal area smooth; anterolateral setae on coxisternum I (1b) 10–15, proximal setae on coxisternum I (1a) 20–28, proximal setae on coxisternum II (2a) 50–57. Prosternal apodeme present. Legs I 63–65, femur 13–15, basiventral femoral setae (bv) 20–23; genu 6–7, antaxial genual setae (l’’) 35–38; tibia 13–14, paraxial tibial setae (l’) 14–15, setae located 1/3 from dorsal base; tarsus 10–11, tarsal setae (u’) 4–5, tarsal empodium simple, 6-rayed, tarsal solenidion knobbed. Legs II 60 –63, femur 10–12, basiventral femoral setae (bv) 20–22; genu 5–6, antaxial genual setae (l’’) 15–16; tibia 11–12; tarsus 10–11, tarsal setae (u’) 4–5, tarsal empodium simple, 6-rayed, tarsal solenidion knobbed. Opisthosoma: dorsal opisthosoma with 23–25 annuli, with triangular microtubercles ahead of annular margins, ventrally with 88–90 annuli, with triangular microtubercles. Setae c 2 18–20 on ventral annulus 16–18; setae d 40–50 on ventral annulus 40–45; setae e 15–18 on ventral annulus 58–61; setae f 30–40 on 6th ventral annulus from rear. Setae h1 5–6. Male genitalia 3–4, 29–30 wide, proximal setae on coxisternum III (3a) 20– 22.

Types. Holotype, female, China: Xinjiang Uygur Autonomous Region, Yili Kazak Autonomous State, 43.55°N, 81.20°E. August 2, 2006, from Betula platyphylla Suk. (Betulaceae) , coll. Zi-Wei Song and Xiao- Feng Xue. Paratype, 9 females and 2 males, with the same data as holotype.

Relation to host. Vagrant on leaf undersurface, causing no apparent damage.

Etymology. The specific designation yilisis is from the locality where the host plant and the new species were collected.

Remarks. This species is similar to Rhyncaphytoptus ulmi Xin & Dong, 1981 , but can be differentiated by the following: dorsal annuli with fissures and last seven annuli with triangular microtubercles ahead of annular margins (dorsal annuli with spiny microtubercles ahead of annular margins in R. ulmi ), female genital coverflap with granules at base (female genital coverflap smooth in R. ulmi ), empodium 6-rayed (empodium 5-rayed in R. ulmi ).

Figures

FIGURE 4. Rhyncaphytoptus yilisis sp. nov. A, dorsal view of female; B, coxae and female genitalia; C, legs I and II; D, lateral aspect of female; E, tarsal empodium; F, male genitalia.