Aceria brevicincta ( Nalepa, 1898 )

Vidović, Biljana, 2011, A new Aceria species (Acari: Eriophyoidea) on Echinops ritro L. subsp. ruthenicus (M. Bieb.) Nyman (Asteraceae) from Serbia and a supplement to the original description of Aceria brevicincta (Nalepa 1898), Zootaxa 2796, pp. 56-66 : 61-65

Aceria brevicincta ( Nalepa, 1898)

( Figs. 3 & 4 )

Eriophyes brevicinctus Nalepa, 1898: 35 (22):234

Female: (n=10). Body wormlike 147–155, 43-53 wide, white in colour. Gnathosoma 16–22, downcurved. Dorsal genual setae (d) 4–5 long, cheliceral stylets 16–19 long. Prodorsal shield 23–25 long, 23–26 wide; anterior half triangular, posterior part semielliptical, with a short lobe over gnathosoma. Prodorsal shield tubercles on rear margin of the shield 16–18 apart, scapular setae (sc) 47–54 projecting posteriorly. Prodorsal shield design consisting of one complete median line; two complete admedian lines; I submedian lines on anterior half, parallel to admedian; II submedian lines slightly mesally curved, approaching to admedian line on rear ¼ of shield; there are numerous dashes between II submedian line and lateral margin of shield. Legs with all usual segments and setae. Leg I 27–31 femur 7, femoral setae (bv) 8–10; genu 5–6, genual setae (l") 25–29; tibia 5–7, tibial setae (l’) 6–8; tarsus 6–7, inner fastigial setae (ft’) 10–13, outer fastigial setae (ft") 21–26; solenidion (ω) 8–9, slightly knobbed; empodium 5–6 and 6 rayed. Leg II 23–27; femur 6–7, femoral setae (bv) 9–11; genu 4–5, genual setae (l") 9–11; tibia 4–5; tarsus 5–6, inner fastigial setae (ft') 6, outer fastigial setae (ft") 23–26; solenidion (ω) 9–10, slight knobbed; empodium 5–6 and 6 rayed. Coxigenital area. Coxal setae (1b) 9–11, 9–11 apart; coxal setae (1a) 17–22, 6–8 apart; coxal setae (2a) 40–42, 18–19 apart. Sternal line 4–6. Genitalia 10–12, 18–20 wide, with 14–17 longitudinal striae in a single row. Coxal setae (3a) 14–17, 14–15 apart. Opisthosoma with subequal annuli, 71–81 dorsal annuli, 71– 80 ventral annuli, 8–9 coxogenital annuli. Annuli with rounded microtubercles, posterior ventral annuli with elongated microtubercles. Setae c 2 27–32, 41–50 apart, on annulus 12–14; setae d 55–58, 36–44 apart, on annulus 24– 29; setae e 23–27, 19–23 apart, on annulus 40–45; setae f 18–22, 16–17 apart, on annulus 64–73; setae h2 69–79, 11 apart; setae h1 6–7, 6–8 apart.

Male (n=3). Body wormlike 148–155, 43–45 wide. Gnathosoma 18, dorsal genual setae (d) 4–5 long, cheliceral stylets 15–17. Prodorsal shield shape and design similar to female, 22–23, 23–25 wide. Tubercles of scapular setae (sc) located on rear margin of shield, 16–17 apart, sc 39–45 long, projecting posteriorly. Leg I 28; femur 6–7, femoral setae (bv) 7–8; genu 4–5, genual setae (l") 25–27; tibia 6–7, tibial setae (l') 6–7; tarsus 5–6, inner fastigial setae (ft') 12–14, outer fastigial setae (ft") 21–23; solenidion (ω) 8–9, slightly knob; empodium 5 and 6 rayed. Leg II 22–24; femur 6–7, femoral setae (bv) 7–8; genu 4, genual setae (l") 11–12; tibia 4–5; tarsus 5–6, inner fastigial setae (ft') 5, outer fastigial setae (ft") 24–25; solenidion (ω) 8–9, slightly knob; empodium 5 and 6 rayed. Coxigenital area. Coxal setae (1b) 8–10, 8–9 apart; coxal setae (1a) 12–15, 7 apart; coxal setae (2a) 31–33, 15–16 apart. Sternal line 5. Genitalia 16–19 wide, coxal setae (3a) 11–12, 13–14 apart. Opisthosoma with subequal annuli: 72– 77 dorsal annuli, 69–72 ventral annuli, 8–9 coxogenital annuli. Annuli with microtubercles similar to that of females. Setae c 2 23–25, 34–42 apart on annulus 12– 13; setae d 45–53, 33–35 apart on annulus 24; setae e 16–18, 18–19 apart on annulus 40–45; setae f 17–19, 12–13 apart on annulus 65–67; setae h2 60–66, 10–11 apart; setae h1 6–7, 6 apart.

Nymph and larva. Not found

Material examined. 10 females (slides ## 157/1,157/4, 157/5, 157/6, 157/9, 157/13, 157/14, 157/16, 157/56 and157/57), 3 males (slides ## 157/51, 157/52 and 157/54) collected from Jurinea mollis (L.)Rchb. ( Asteraceae ), Serbia, Deliblato Sands (Deliblatska peščara, Široka torina, 44o51.179’N, 21o06.119’E), 10 June 2007 coll. R. Petanoviċ; 40 females (slides ## 157/2, 3, 7, 8, 10, 11, 12, 15, 17–38, 50,59–66), 2 males (slides ## 157/53 and 157/55), the same collection details as previous; 26 females (slides ## 291/1–26), 5 males (slides ## 291/27–31) the same host, locality and collector on 22 June 2008.

Host plant. Jurinea mollis (L.)Rchb. ( Asteraceae )

Relation to host. Vagrant on the lower leaf surfaces causing no visible damage.

Remarks. A comparison of A. brevicincta from Serbia with the original description by Nalepa (1898, 1900), is difficult because only 4 meristic and 2 morphometric characters of the female were presented. Females of A. brevicincta from Serbia are shorter and slightly wider than those from Austria. They also have 6-rayed empodia (5- rayed in the Austrian population), with sc setae that are twice as long. The female coverflap is not as wide and the annuli are slightly less numerous. There is a more detailed description of A. brevicincta from Hungary by Farkas (1965, 1966). Females of A. brevicincta from Serbia are significantly smaller than specimens from Hungary. They also have a shorter prodorsal shield and the distance between the sc tubercles is less along with having shorter sc setae. The empodia in the population from Serbia are 6-rayed (5-rayed in the Hungarian population), with shorter legs and a narrower female coverflap. The annuli are also slightly fewer (Table 2).

Figures

FIGURE 3. Aceria brevicincta (Nalepa, 1898): CG. coxigenital region of female; CS. lateral view of caudal region; DA. dorsal view of prodorsal shield; em. empodium; ES. lateral view of annuli; GM. genital region of male; IG. internal female genitalia; L 1. leg I of female; SA. lateral view of anterior region.

FIGURE 4. SEM photographs of Aceria brevicincta female: A. dorsal view of anterior region; B. ventral view of anterior region.