Aceria kuko ( Kishida, 1927 )

Ripka, Géza & Sánchez, Iňigo, 2017, A new Aceria species (Acari: Eriophyidae) from Spain on Pycnocomon rutifolium (Dipsacaceae) and supplementary descriptions of Aceria eucricotes and A. kuko from Lycium spp. (Solanaceae), Zootaxa 4244 (2), pp. 195-206 : 202-204

Aceria kuko ( Kishida, 1927)

( Figure 5 )

Redescription. Female (n= 12). Body whitish yellow, ochre, vermiform, 178–290, 60 wide, 55–83 thick. Gnathosoma 15–20, projecting obliquely downwards; chelicerae 13–16, dorsal palp genual setae d 4–5, simple, pedipalp coxal setae ep 2 (2–3). Prodorsal shield 25–31, 29–30 wide, triangular in shape, with a short frontal lobe 1–2, over base of chelicerae; shield smooth. Tubercles of scapular setae sc on rear shield margin, 20–25 apart, diverging, scapular setae sc 28–40, directed backwards. Close to posterior shield margin microtubercles in 2¯3 irregular rows between the tubercles of scapular setae sc. Fine circular and oval granules situated in lateral rows on epicoxal areas, i.e. laterally between shield margin and dorsal coxae of legs I and II (sensu Chetverikov & Craemer 2015). Legs with all usual segments and setae present. Leg I 26–34, femur 8–10, basiventral femoral setae bv 10– 12, genu 4–5, antaxial genual setae l″ 25–27, tibia 5–8, paraxial tibial setae l ′ located at ½–¾ from dorsal base, 4– 5, very fine, tarsus 4–6, paraxial, unguinal tarsal setae u ′ 4, solenidion ω 6–8, curved, distally either rounded or with small knob, empodium simple, 5–6, 5-rayed, each ray of four basal pairs with additional secondary branches. Leg II 24–30, femur 7–9, basiventral femoral setae bv 10–12, genu 3–4, antaxial genual setae l″ 9–10 very fine, tibia 5–6, tarsus 5–6, paraxial, unguinal tarsal setae u ′ 4, solenidion ω 7, curved, distally either rounded or with small knob, empodium simple, 6–7, 5-rayed, each ray of four basal pairs with additional secondary branches. Some specimens with asymmetrical terminal rays in length. Tiny denticles present on anterior margin of femora and tibiae on both leg pairs. Coxae I smooth, coxae II with 4¯9 granules; setae 1b 7–10, tubercles 1b 7–8 apart; setae 1a 18–35, tubercles 1a 6–7 apart, setae 2a 41–52, tubercles 2a 17–18 apart. Prosternal apodeme distinct 8–12, forked. Coxigenital area with 4–7 microtuberculate semiannuli. Opisthosoma with 64–84 dorsal semiannuli, 55–70 ventral semiannuli. Dorsal and ventral semiannuli microtuberculate. 5–7 dorsal semiannuli near anal lobes almost smooth. Round, elongate and pointed microtubercles close to rear annular margin, except for 5–8 ventral semiannuli near anal lobes, which are elongate and linear. Setae c 2 21–28, on ventral annulus 10–12, 47–48 apart. Setae d 60–85, on ventral annulus 20–25, 35–40 apart; setae e 51–70, on ventral annulus 32–42, 27–28 apart; setae f 23–30, on ventral annulus 51–64, or 5–6 from rear, 22–23 apart, all very fine towards apex. Setae h2 60–95, 9–10 apart; setae h1 4–6, 7–8 apart. Genital plate 12–15, 15–17 wide, genital coverflap smooth. Setae 3a 17–23, 12–15 apart.

Male (n= 4). Similar to female, 160–197, 65 wide, 62 thick. Gnathosoma 17–20, projecting obliquely downwards; chelicerae 12–17, dorsal palp genual setae d 5–6, simple. Prodorsal shield 28–29, 31 wide, with a short frontal lobe 1–2, triangular in shape, ornamentation similar to female. Tubercles of scapular setae sc on rear shield margin, 25 apart, scapular setae sc 30–36, directed to the rear. Close to posterior shield margin microtubercles in 2¯3 irregular rows between the tubercles of scapular setae sc. Fine circular and oval granules situated in lateral rows on epicoxal areas. Leg I 27–30, femur 8–9, basiventral femoral setae bv 10–12, genu 4–5, antaxial genual setae l″ 20–25, tibia 7, paraxial tibial setae l ′ located at ½–¾ from dorsal base, 5–6, very fine, tarsus 5–6, paraxial, unguinal tarsal setae u ′ 3, solenidion ω 7, curved, distally either rounded or with small knob, empodium simple, 5– 6, 5-rayed, each ray of four basal pairs with additional secondary branches. Leg II 25–27, femur 8–9, basiventral femoral setae bv 12, genu 3–4, antaxial genual setae l″ 9–11 very fine, tibia 6, tarsus 5–6, paraxial, unguinal tarsal setae u ′ 3, solenidion ω 6–7, curved, distally either rounded or with small knob, empodium simple, 6, 5-rayed, each ray of four basal pairs with additional secondary branches. Some specimens with asymmetrical terminal rays in length. Tiny denticles present on anterior margin of femora and tibiae on both leg pairs. Coxa I smooth, coxa II with 4¯9 granules; setae 1b 7, tubercles setae 1b 8 apart, setae 1a 16, tubercles setae 1a 7 apart, setae 2a 34, very fine, tubercles setae 2a 17 apart. Prosternal apodeme distinct 7–9, forked. Coxigenital area with 6–7 microtuberculate semiannuli. Opisthosoma with 73–83 dorsal, 65–70 ventral semiannuli. Microtuberculate dorsal and ventral semiannuli. Round, elongate and pointed microtubercles set on rear annular margin, except for 5–7 ventral semiannuli of anal lobes, which are elongate and linear. 5–7 dorsal semiannuli near anal lobes almost smooth. Setae c 2 22–27, on ventral annulus 11–12, 50 apart; setae d 62, on ventral annulus 22–24, 37 apart; setae e 49, on ventral annulus 39–41, 27 apart; setae f 27–28, on ventral annulus 60–65, or 5 from rear, 21 apart. Setae h2 61–62, 7 apart; setae h1 3–4, 5 apart. Genitalia 15–17, 19–22 wide, with minute granules, setae 3a 13–14, 17 apart.

Nymph (n= 4). White, vermiform, 117–182, 50–64 thick. Gnathosoma 9–17, chelicerae 12–16. Prodorsal shield 22–30, 25 wide. Tubercles of scapular setae sc on rear shield margin, 22 apart, scapular setae sc 13–22, pointing rear. Leg I 17–22, leg II 14–20. Opisthosoma with 62–65 dorsal, 47–49 ventral semiannuli. Dorsal and ventral semiannuli with minute microtubercles like dots. Setae c 2 10–14, on ventral annulus 9–11; setae d 20–23, on ventral annulus 18–21; setae e 20–22, on ventral annulus 28–30; setae f 10–15, on ventral annulus 43–44, or 4– 5 from rear. Setae h 2 30–33; setae h1 3. Setae 3a 5–7.

Host plant. Barbary matrimony-vine or Chinese wolfberry, Lycium barbarum L. ( Solanaceae ).

Relation to the host plant. The mite was found in all stages of development in the leaf galls. The minute galls of 2-4 mm in diameter were yellowish green then violet in colour and projected from both sides of the leaf.

Locality. In city Heves (Heves county, 47°35'53.8" N; 20°16'55.8" E, 96 m elev. 26 June 2014) Central Hungary, in a private garden; in Budapest (district XXII, Budafok, 47°25'36.2" N, 19°02'09.7" E, 129 m elev. 15 July 2014; and district XI, Sasad, 47°27'54.0" N, 19°00'43.3" E, 123 m elev. 8 September 2014) Central Hungary. Host plants grow in street.

Material examined. Females, males and nymphs on slides #1342a,b (from Heves), #1351a,b,c (from Budapest, district XXII) and #1359a,b,c (from Budapest, district XI), deposited in the Department of Pest Management Development and Coordination, Directorate of Plant Protection, Soil Conservation and Agrienvironment, National Food Chain Safety Office , Budapest, Hungary .

Current geographical distribution. Aceria kuko is known from Japan, China, South Korea and Taiwan ( Amrine & Stasny 1994; Davis et al. 1982; Hong & Zhang 1996; Huang 2008; Kishida 1927; Manson 1972). It was intercepted in the Netherlands, Great Britain and Guernsey on ‘Goji berry’ plants imported from China (Ostojá- Starzewski 2009). Recently it has been recorded in Germany, Greece, Hungary, Serbia, Slovenia, Rumania and Bulgaria (Anonymous 2011, 2012, 2016; Chireceanu et al. 2015; Ripka et al. 2015; Seljak 2013; Vidović et al. 2015).

Differential diagnosis. Aceria kuko differs from A. eucricotes by having granules in rows between shield margin and dorsal coxae of legs I and II (whereas no granules on epicoxal areas in A. eucricotes ), microtubercles present in two or three irregular rows between tubercles of scapular setae sc close to posterior shield margin (versus no microtubercles in A. eucricotes ). A. kuko has smooth 5–7 dorsal semiannuli near anal lobes (apparently these dorsal semiannuli with minute microtubercles and not smooth in A. eucricotes ). In A. kuko , the tibia of leg I is longer than tarsus of respective leg. A. eucricotes differs from A. kuko in the length of setae 1a 40–42, setae 1b 16– 22, basiventral femoral setae bv on leg I 16–18, antaxial genual setae l″ on leg I 27–37 and antaxial genual setae l″ on leg II 12–15 (whereas 18–35, 7–10, 10–12, 25–27, 9– 10 in A. kuko , respectively).

Figures

FIGURE 5. Aceria kuko (Kishida), semischematic drawings. (Géza Ripka) Scale bar: 17 µm for AL; 12 µm for AD, 11 µm for CG, 18 µm for LO; 9 µm for IG; 9 µm for L 1, 19 µm for PM; 9 µm for GM; 2 µm for em.