Aculus bistichos, Flechtmann, Carlos H. W., 2004

Flechtmann, Carlos H. W., 2004, New genus and seven new species of Brazilian eriophyoid mites and redescription of Catachela machaerii Keifer (Acari: Prostigmata: Eriophyoidea), Zootaxa 611, pp. 1-20 : 6-7

Aculus bistichos n.sp. ( Fig. 3 )

DIAGNOSIS — Prodorsal shield design with two semicircular arched lines on posterior half, embracing admedian lines; epigynum with a medially incomplete transverse, arched line, dividing longitudinal scores in two ranks.

FEMALE (n = 6) — Body elongate, 247 (183–247), 86 (77–91) wide. Gnathosoma downcurved; basal seta 4 (3–4); antapical seta 9 (6–9); chelicera 22 (19–24). Prodorsal shield semicircular, 50 (48–53), strongly declivitous anteriorly; frontal lobe bent up, only visible in lateral view. Shield design of median and admedian lines connected by transverse lines at anterior one fourth and half; two transverse, arched lines laterally from anterior one fourth of admedian lines with two pairs of short, anteriorly directed lines; two semicircular arched lines from half admedian lines, to rear admedian and median lines. Shield tubercles near rear shield margin, 49 (48–54) apart, directing scapular setae (sc) backwards; sc 41 (34–43). Legs with all segments and usual setae present. Leg I 24 (24– 26); femur 8 (8–10), femoral seta (bv) 10 (9–11); genu 5 (3–5), genual seta (l") 26 (26–30); tibia 5 (3–5), tibial seta (l') 18 (18–24); tarsus 6 (4–6), dorsal seta (ft') 14 (14–18), lateral seta (ft") 19 (19–25), unguinal seta (u') 5 (5–6), solenidion blunt, 5 (5–6), empodium 5 (5– 6), 6–rayed. Leg II 25 (24–26); femur 9 (8–11), bv 18 (17–20); genu 3 (3–4), l" 7 (6–9); tibia 3 (3–4); tarsus 4 (4–6), ft' 6 (6–10), ft" 25 (23–26), u' 5 (5–6) solenidion 8 (8–9), empodium 5 (5–8), 6­rayed. Coxigenital area: coxae smooth; no sternal line. Coxal seta I (1b) 5 (5–7), 10 (10–12) apart; coxal seta II (1a) 17 (16–27), 14 (14–15) apart; coxal seta III (2a) 37 (33–38), 27 (26–29) apart. Coxisternal area with 5 (5–6) annuli, microtuberculate. Genitalia 25 (24–28) wide, 18 (15–21) long; genital seta (3a) 11 (8–13). Epigynum with two ranks of longitudinal lines, 8 (4–10) in the basal set, 7 (6–8) in the distal set, separated by a medially interrupted transverse arched line. Opisthosoma with a slight mediodorsal ridge extending over the first 8 (6–10) dorsal annuli; otherwise, evenly arched in transverse section. Lateral seta (c2) 21 (21–31), on annulus 5 (5–6) counting from genitalia rear margin. Ventral seta I (d) 66 (66–75), 44 (40–47) apart, on annulus 16 (14–17); ventral seta II (e) 17 (13–18), 26 (24–31) apart, on annulus 29 (26–30); ventral seta III (f) 27 (26–28), 26 (26–31) apart, on annulus 52 (49–52) or 9th from rear. Total ventral annuli 60 (56–61), microtuberculate; total dorsal annuli 54 (49–56), smooth on anterior twothirds, with small microtubercles on caudal one­third. Caudal seta (h2) 46 (46–58); accessory seta (h1) missing.

MALE (n = 2) — Smaller than female, 178–184, 72 wide. Gnathosoma: basal seta 4; antapical seta 7; chelicera 17–18. Prodorsal shield 44–45; shield tubercles 44–47 apart; sc 26–28. Legs: leg I 23–25; femur 8–9, bv 9–10; genu 4, l" 27; tibia 3–4, l' 13–16; tarsus 4– 5, ft' 12–18, ft" 18–21, u' 4–5, solenidion 5, empodium 5, 6­rayed. Leg II 21–22; femur 7– 9, bv 13–16; genu 3, l" 8; tibia 3; tarsus 4, ft' 6–7, ft" 20–21, u' 5, solenidion 7–8, empodium 5, 5–6 rayed. Coxigenital area: 1b 6–7, 9–10 apart; 1a 13–18, 11–13 apart; 2a 23– 28, 25–26 apart. Coxisternal area with 4–7 annuli, microtuberculate. Genitalia 14–18 wide, 11–12 long; 3a 9–10, smooth. Opisthosoma: c 2 18–19, on annulus 3–5; d 40–47, 35–37 apart, on annulus 12–13; e 11–13, 22–23 apart, on annulus 20–25; f 21–24, 20–24 apart, on annulus 39–47 or 8–9th from rear. Total ventral annuli 47–54; total dorsal annuli 44–47. Seta h2 47–42; h1 missing.

RELATION TO HOST — undersurface leaf vagrants; rust.

TYPE MATERIAL — Holotype female, 52 female, 2 male paratypes, from Guapira opposita (Vell.) Reitz. (Nyctaginaceae) , Fazenda Capoava, Itú, São Paulo, Brazil (23° 12' 86" S, 47° 10' 70" W), 31 Jul. 2002, coll. CHW Flechtmann, on 10 microscopic preparations.

ETYMOLOGY — The specific designation bistichos is derived from the Latin bi, two plus the Greek stichos, row, rank, and refers to the lines on the epigynum, arranged in two rows.

REMARKS — Aculus bistichos n.sp. is readily recognizable by the longitudinal lines on the epigynum in two ranks, so far not found elsewhere among eriophyids belonging to the genus Aculus .

Figures

FIGURE 3. Aculus bistichos n. sp. AL, anterolateral aspect of female; D, dorsal aspect of female; E, empodium (enlarged); GM, male genitalia (enlareged); L 1, leg I (enlarged); L 2, leg II (enlarged).