Diptacus sorbusis, Song, Zi-Wei, Xue, Xiao-Feng & Hong, Xiao-Yue, 2007

Song, Zi-Wei, Xue, Xiao-Feng & Hong, Xiao-Yue, 2007, Description of seven new species in the genus Diptacus Keifer (Acari: Eriophyoidea: Diptilomiopidae: Diptilomiopinae) from northwestern China, Zootaxa 1429, pp. 39-53 : 51-52

Diptacus sorbusis sp. nov.

( Fig. 7 )

Description. FEMALE: (n = 10) Body fusiform, 325 (325–335), 102 (102–105) wide, 110 (107–110) thick; light yellow. Gnathosoma 70 (70–75), pedipalp coxal setae (ep) 4 (3–4), dorsal pedipalp genual setae (d) 10 (9–10), gnathosoma projecting downwards. Prodorsal shield 41 (41–42), 63 (63–64) wide; prodorsal shield subcircular anteriorly and without frontal lobe; prodorsal shield design with complete, straight median line, complete, sinuous admedian lines connected with submedian lines by transverse lines at anterior 1/3, forming cell-like network anteriorly. Scapular tubercles ahead of rear margin, 23 (22–24) apart, scapular setae (sc) 5 (5–6) projecting antero-medially. Coxal area smooth; anterolateral setae on coxisternum I (1b) 23 (20–23), proximal setae on basal coxisternum I (1a) 35 (35–40), proximal setae on coxisternum II (2a) 65 (65–70). Prosternal apodeme present. Legs I 73 (71–73), femur 21 (20–21), basiventral femoral setae (bv) absent; genu 10 (9–10), antaxial genual setae (l'') 43 (42–50); tibia 20 (20–21), paraxial tibial setae (l') 9 (9–10), setae located at 1/2 from dorsal base; tarsus 12 (11–12), tarsal setae (u') 4 (3–4), tarsal empodium divided, each empodial branch six-rayed, tarsal solenidion knobbed. Legs II 69 (68–69), femur 20 (19–20), basiventral femoral setae (bv) absent; genu 10 (9–10), antaxial genual setae (l'') 15 (13–15); tibia 18 (17–18); tarsus 11 (10– 11), tarsal setae (u') 4 (3–4), tarsal empodium divided, each empodial branch six-rayed, tarsal solenidion knobbed. Opisthosoma: dorsal opisthosoma with 40 (39–43) annuli, smooth but uneven, ventrally with 75 (75–77) annuli with triangular microtubercles. Setae c2 60 (55–62) on ventral annulus 17 (16–19); setae d 68 (68–70) on ventral annulus 30 (29–31); setae e 50 (40–65) on ventral annulus 47 (45–47); setae f 53 (50–53) on 10th ventral annulus from rear. Setae h1 minute. Female genitalia 20 (19–21), 32 (30–32) wide, coverflap smooth, proximal setae on coxisternum (3a) III 15 (14–15).

MALE: (n = 8) 255 (255–270), 70 (70–78) wide, genitalia 4 (4–5), 25 (25–26) wide, proximal setae on coxisternum III (3a) 12 (12–13).

Types. Holotype, female, from Sorbus sp. L. ( Rosaceae ), Guan’e Gou, Dangchang County, Gansu Province, China, 33°57’39’’N, 104°19’45’’E, September 13, 2005, collected by Zi-Wei Song and Xiao-Feng Xue. Paratypes, 9 females and 8 males, with the same date as holotype.

Relation to host. Mites are vagrant on the undersurface of leaves, causing no apparent damage.

Etymology. The specific designation sorbusis is from the generic name of the host plant, Sorbus .

Note. This species is similar to Diptacus platyphyllae Xue, Song & Hong, 2006 , but can be differentiated by dorsal opisthosoma annuli uneven and ventral annuli with triangular microtubercles (dorsal opisthosoma annuli even and ventral annuli with microtubercles between ventral setae and smooth laterally in D. platyphyllae ), coxal area smooth (coxal area I with short lines in D. platyphyllae ), each empodial branch six-rayed (four-rayed in D. platyphyllae ).

Figures

FIGURE 7. Diptacus sorbusis 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.