Trimeroptes longlinensis, Tan & Lv & Ruan & Zhao, 2021

Tan, Meng-Chao, Lv, An-Kang, Ruan, Hong-Yan & Zhao, Ping, 2021, Two new Diptacus and one new Trimeroptes species (Acari: Diptilomiopidae) from China, Zootaxa 5067 (2), pp. 224-236 : 232-235

Trimeroptes longlinensis sp. nov.

( Figs. 5–6 )

Description. Female (n=13): Body fusiform, light yellowish, 174 (162–186), 68 (68–72) wide, 72 (70–75) thick, dorsally covered with white wax. Gnathosoma 36 (35–38), projecting downwards, setae ep 3 (2–3), setae d 12 (11–12); setae v 2 (2–3); cheliceral stylets 45 (43–46). Prodorsal shield 50 (50–52), including frontal lobe, 55 (53–57) wide; shield design with few interrupted lines in median part; frontal lobe 14 (14–16) over gnathosomal base; scapular tubercles placed ahead rear shield margin, 27 (27–29) apart, setae sc 17 (17–18), directed upward. Coxisternal plates with several short lines and distinct dashes; setae 1b 15 (13–16), 15 (14–16) apart; setae 1a 14 (14–15), 10 (9–10) apart; setae 2a 24 (22–25), 28 (27–30) apart. Coxigenital semiannuli 19 (19–22), microtuberculated. Legs: Six segments, lacking setae on both femora. Leg І 43 (42–45), trochanter 3*, femur 14 (14–15), setae bv absent; genu 5*, setae l'' 34 (30–35); tibia 13 (13–14), setae l′ located at 3/4 from dorsal base, 6 (6–7); tarsus 8 (7–8), tarsal setae ft' 23 (23–25), tarsal setae ft'' 25 (24–27), tarsal setae u' 5 (4–5); tarsal empodium em, divided, 6 (6–7), 5-rayed*, tarsal solenidion ω 7 (6–7), knobbed. Leg ІІ 41 (39–42), trochanter 3*, femur 14 (13–14), setae bv absent; genu 5*, setae l'' 10 (10–12); tibia 12 (11–12); tarsus 7 (7–8), tarsal setae ft' 7 (6–7), tarsal setae ft'' 22 (20–23), tarsal setae u' 4 (4–5); tarsal empodium em, divided, 7 (6–7), 5-rayed*, tarsal solenidion ω 7 (6–7), knobbed. Opisthosoma: dorsal opisthosoma with one median and two lateral ridges, median ridge divided at anterior 6–7 annuli; dorsal annuli 41 (40–42), smooth; ventral annuli 98 (97–102), with round microtubercles on rear annular margins, last 11 (11–12) ventral semiannuli with elongated microtubercles; setae c2 18 (17–20), 61 (60–62) apart, on ventral annulus 31 (31–32); setae d 56 (51–58), 42 (42–43) apart, on ventral annulus 50 (49–51); setae e 14 (12–14), 21 (20–21) apart, on ventral annulus 68 (68–70); setae f 30 (28–31), 20 (20–21) apart, on 7 th ventral annulus from the rear; setae h1 absent, setae h2 95 (91–97), 7 (6–7) apart. Female genitalia: 16 (16–18), 31 (30–32) wide; coverflap with 8 (8–10) longitudinal striae; setae 3a 10 (9–11), 19 (19–20) apart.

Male (n=4): Smaller than females and generally similar to them. Body fusiform, light yellowish, 140–146, 58–60 wide. Gnathosoma 34–35, setae ep 2*, setae d 10–11; setae v 2–3; cheliceral stylets 45–46. Prodorsal shield 38–42, including frontal lobe, 48–50 wide; frontal lobe 10–12; scapular tubercles placed ahead rear shield margin, 26–27 apart, setae sc 15–16, directed upward. Coxisternal plates, setae 1b 13–14, 12–13 apart; setae 1a 14*, 8–9 apart; setae 2a 23–25, 25–27 apart. Coxigenital semiannuli 14–16, microtuberculated. Leg І 40–41, trochanter 3*, femur 13*, setae bv absent; genu 5*, setae l'' 31–33; tibia 12–13, setae l′ located at 3/4 from dorsal base, 4–5; tarsus 7*, tarsal setae ft' 19–21, tarsal setae ft'' 18–22, tarsal setae u' 4–5; tarsal empodium em, divided, 6*, 5-rayed*, tarsal solenidion ω 6–7, knobbed. Leg ІІ 39–41, trochanter 3*, femur 13–14, setae bv absent; genu 5*, setae l'' 8–9; tibia 11*; tarsus 7–8, tarsal setae ft' 6–7, tarsal setae ft'' 21–23, tarsal setae u' 4–5; tarsal empodium em, divided, 6*, 5- rayed*, tarsal solenidion ω 6–7, knobbed. Opisthosoma: dorsal annuli 40–41, ventral annuli 79–83; setae c2 14–15, 54–56 apart, on ventral annulus 22–23; setae d 47–50, 40–41 apart, on ventral annulus 34–36; setae e 11–12, 20* apart, on ventral annulus 52–54; setae f 25–26, 19–20 apart, on 7 th ventral annulus from the rear; setae h1 absent, setae h2 93–96. Male genitalia: 23–24 wide; setae 3a 7–8, 19–20 apart.

Type material. Holotype: female (slide number EDD3-3.1), Jinzhongshan National Nature Reserve, Longlin County, Baishe City, Guangxi Zhuang Autonomous Region, P. R. China, 24°37′2″N, 104°57′3″E, elevation 1800m, 1 July 2020, from Carpinus sp. (Betulaceae) , collected by Mengchao Tan & Ping Zhao. Paratypes: 12 females and 4 males (slide number EDD3-3.2~3.17), with the same data as the holotype.

Relation to host. The mite found to be vagrant on the undersurfaces of leaves of their associated host causing no visible damage.

Etymology. The specific name longlinensis refers to the “Longlin County”, the locality where the holotype was collected. The gender is masculine.

Differential diagnosis. The new species is morphologically similar to Trimeroptes luanchuanensis Xue & Hong, 2005 , based on the setae h1 absent, coxisternal plates with short lines. The differences between two species are the following: prodorsal shield with few interrupted lines in the median part in T. longlinensis sp. nov. (versus prodorsal shield smooth in T. luanchuanensis ); number of dorsal annuli and ventral annuli 40 to 42 and 97 to 102, respectively, in T. longlinensis sp. nov. (versus 38 and 66, respectively, in T. luanchuanensis ), ray number of em 5 in T. longlinensis sp. nov. (versus 3 in T. luanchuanensis ), number of longitudinal striae on coverflap 8 to10 in T. longlinensis sp. nov. (versus 14 in T. luanchuanensis ), length of setae d 51–58 μm in T. longlinensis sp. nov. (versus 35 μm in T. luanchuanensis ).

Figures

FIGURE 5. Line drawings of Trimeroptes longlinensis sp. nov.: AL. Lateral view of anterior body region; CGF. Coxigenital region of female; D. Dorsal view of female; em. Empodium; GM. Genital region of male; IG. Internal genitalia of female; LO. Lateral view of annuli; L1. Leg I; L2. Leg II; PM. Lateral view of posterior opisthosoma. Scale bar: 5 μm for em; 10 μm for LO; 15 μm for CGF, GM, IG, L1, L2; 20 μm for AL; 25 μm for D, PM.

FIGURE 6. Images of Trimeroptes longlinensis sp. nov.: (A) Prodorsal shield, female; (B) Coxigenital region of female; (C) Ventral view of posterior opisthosoma; (D) Genital region of male; (E) Legs. Scale bar: 15 μm for B, C, D, E; 20 μm for A.