Tetra nitidae, Ruan & Shou & Lian & Tan, 2023

Ruan, Hong-Yan, Shou, Ru-Fang, Lian, Ran-Ran & Tan, Meng-Chao, 2023, Two new species of eriophyoid mites (Acari: Prostigmata: Eriophyoidea) associated with Callerya Endl. and supplementary descriptions of Fujianacarus wisterianis from China, Zootaxa 5369 (3), pp. 413-426 : 414-417

Tetra nitidae sp. nov. ( Figures 1–2 )

http://www.zoobank.org/ urn:lsid:zoobank.org:act:E3341DE0-2070-4795-B255-E69087D96422

Description. Female (n=10). Body fusiform, 183 (178–205) including gnathothoma, 48 (45–51) wide, 45 (45–48) thick, white in color. Gnathosoma 22 (20–24) curved downwards, cheliceral stylets 16 (15–17), pedipalp coxal seta ep 2 (2–3), dorsal pedipalp genual setae d 6 (5–7), unbranched, palp tarsal ventral setae v 2 (2–3). Prodorsal shield 34 (30–34) including the frontal lobe, 35 (34–40) wide. Frontal lobe 6 (6–8). Median line incomplete, broken at ⅓ and ⅔ of the shield; admedian lines complete and sinuous, two curved transverse lines arc anteriorly from anterior ⅓ to lateral shield margin; one pair of submedian lines present on half of the shield and slightly sinuous. Scapular tubercles on rear shield margin, 6 (5–7), setae sc 29 (25–32), 18 (18–20) apart. Coxal plates with short lines and granules; prosternal apodeme 7 (6–8); anterolateral setae on coxisternum І 1b 5 (5–6), 11 (10–12) apart; proximal setae on coxisternum І 1a 9 (7–11), 8 (7–10) apart, proximal setae on coxisternum ІІ 2a 19 (16–20), 20 (19–23) apart. Coxigenital region with 4 (4–5) semiannuli between coxae and genitalia. Leg I 25 (23–27); trochanter 3 (2–3), femur 8 (7–9), basiventral femoral setae bv 8 (8–9); genu 4 (3–4), antaxial genual setae l ″ 21 (18–21); tibia 5 (5–6), paraxial tibial setae l ′ 6 (5–6), located at basal 1/3; tarsus 5 (4–5), paraxial fastigial tarsal setae ft ′ 15 (13–18), antaxial fastigial tarsal setae ft ″ 17 (14–20), paraxial unguinal tarsal setae u’ 3 (2–3); tarsal solenidion ω 6 (6–8), curved down, knobbed; tarsal empodium 5 (5–6), 7-rayed. Leg II 23 (21–26); trochanter 2 (2–3), femur 8 (7–8), setae bv 8 (7–9); genu 3 (3–4), setae l ″ 6 (5–7); tibia 4 (4–5); tarsus 5 (4–5), setae ft ′ 5 (5–7), setae ft ″ 17 (16–19), setae u’ 3 (2–3); tarsal solenidion ω 7 (6–8), curved down, knobbed; tarsal empodium 5 (5–6), 7-rayed. Opisthosoma dorsally with a wide furrow, 32 (32–33), smooth except anterior 3 annuli and lateral annuli with elliptical microtubercles; 52 (52–55) ventral semiannuli, with rounded microtubercles close to the rear margins of annuli. Setae c2 24 (22–27), 40 (37–41) apart, on ventral semiannulus 9 (9–10); setae d 33 (30–38), 30 (27–32) apart, on ventral semiannulus 20 (20–21); setae e 13 (10–13), 14 (14–17) apart, on ventral semiannulus 34 (33–34); setae f 21 (17–22), 17 (17–19) apart, on 6 th ventral annulus from rear; setae h1 3 (3–4), seta h2 75 (65–78), 8 (8–10) apart. External genitalia 12 (10–13), 16 (16–18) wide, coverflap with 12 (10–12) longitudinal striae; setae 3a 19 (17–21), 15 (14–17) apart. Internal genitalia, with anterior, trapezoidal transversal apodeme, longitudinal bridge relatively long; oblique apodeme present; spermathecal tubes short, directed latero-posterad; both spermathecae oval-shaped and are equal in size.

Male (n=3). Similar in shape and prodorsal shield arrangement to female. Body 145–167 including gnathothoma, 40–45 wide, whitish in color. Gnathosoma 17–20 curved down, cheliceral stylets 18–19, setae ep 2–3, setae d 6–7, unbranched, setae v 2–3. Prodorsal shield 30–33, 37–40 wide. Scapular tubercles on rear shield margin, setae sc 18–21, 22–23 apart. Coxae, setae 1b 7–8, 9–11 apart; setae 1a 12–13, 7–8 apart; setae 2a 17–19, 18–20 apart. Leg I 23–25; femur 7–8, setae bv 8–10; genu 3–4, setae l ″ 15–17, tibia 5, setae l ′ 6–7; tarsus 5–6, setae ft ′ 18–20, setae ft ″ 19–22, setae u’ 5; tarsal solenidion ω 6–8, tarsal empodium 6, 7-rayed. Leg II 22–24; femur 7–8, setae bv 12–14; genu 3–4, setae l ″ 15–17, tibia 4–5; tarsus 5–6; setae ft ′ 4–5, setae ft ″ 19–21, setae u’ 3–4; tarsal solenidion ω 7–8, tarsal empodium 5, 7-rayed. Opisthosoma, 31–33 dorsal semiannuli; 49–51 ventral semiannuli. Setae c2 20–24, 37–39 apart, on ventral semiannulus 7; setae d 19–25, 27–31 apart, on ventral semiannulus 15–17; setae e 13–15, 12–15 apart, on ventral semiannulus 28–30; setae f 15, 16–18 apart, on 6 th ventral annulus from rear; setae h1 3–4, setae h2 52–58, 8–9 apart. Genitalia 15–17 wide; setae 3a 16–20, 12–14 apart.

Type material. Holotype: female (slide number EPT9-1.1, marked Holotype), Jinzhongshan National Nature Reserve , Baise City, Guangxi Zhuang Autonomous Region, China (24°37′19″N, 104°54′40″E, elevation 1460 m), 2 July 2020, from Callerya nitida (Bentham) R. Geesink (Leguminosae) . Coll. Mengchao Tan. Paratypes: 14 females and three males (slide numbers EPT9-1.2~1.18), same data as holotype .

Host plant. Callerya nitida (Bentham) R. Geesink (Leguminosae) .

Relation to host. The mite is a vagrant on the undersurfaces of leaves and causes no visible damage.

Etymology. The specific designation nitidae is from the specific name of the host plant, nitida .

Differential diagnosis. T. nitidae sp. nov. is similar to Tetra formosae Xue & Hong, 2005 , from Lespedeza thunbergii (DC.) Nakai (Synonym: Lespedeza formosa (Vog.) Koehne ) (Leguminosae), and Tetra tephrosiae Mohanasundaram, 1983 , from Tephrosia purpurea (L.) Pers. (Leguminosae) in terms of the number of empodium rays (7-rayed), dorsally with smooth middle furrow, coxal plates with short lines and granules, coverflap ornamentation, setae h1 present. Moreover, T. nitidae sp. nov. is close to Tetra sativae Li, Li, Zhang & Xue, 2014 , from Medicago sativa L. (Leguminosae), and Tetra glycyrrhizae Denizhan, Monfreda, Çobanoglu & de Lillo, 2009 , from Glycyrrhiza glabra L. (Leguminosae) in terms of shield pattern, coxae and coverflap ornamentation, setae h1 present. But these five species distinctly differ in dorsal semiannuli ornamentation, the median line of prodorsal shield, the number of the dorsal annuli, length of setae sc, setae 3a, ventral setae d, ventral setae e ( Table 1 ).

Figures

FIGURE 1. Line drawings of Tetra nitidae sp. nov.: CGF. Coxigenital region of female; D. Dorsal view of female; em. Empodium; GM. Male genital region; IG. Female internal genitalia; L. Lateral view of female; L1. Leg I; L2. Leg II. Scale bar: 45 μm for D, L; 20 μm for CGF, GM, IG; 16 μm for L1, L2; 7 μm for em.

FIGURE 2. Images of Tetra nitidae sp. nov.: A. Lateral view of female; B. Coxigenital region of female; C. Prodorsal shield, female; D. Lateral view of annuli; E. Dorsal view of opisthosoma; F. Genital region of male; G. Internal female genitalia; H. Empodium. Scale bar: 50 μm for A, E; 30 μm for C; 20 μm for B; 10 μm for D, F, G; 5 μm for H.