Rhyncadicrus asperulus, Reis & Gondim & Navia & Flechtmann, 2011

Reis, Aleuny C., Gondim, Manoel G. C., Navia, Denise & Flechtmann, Carlos H. W., 2011, New eriophyoid mites (Acari: Prostigmata: Eriophyoidea) from banana and heliconia in Northeastern Brazil — two new genera and three new species, Zootaxa 3042, pp. 15-26 : 20-23

Rhyncadicrus asperulus n. gen. n. sp. Reis & Navia

( Figs. 3 & 4 )

FEMALE (n=10). Body fusiform, 174 (169–210), 74 (71–91) wide; colour in life yellowish. Gnathosoma downcurved, 42 (40–45); antapical seta (d) 15 (12–15), simple; palp distal segments (palp tibia and tarsus) distinctively elongated, palp tarsus with three setae: a rigid one, slightly expanded apically and curved (which seems to be a solenidion), 4 (4), and two lateral, a longer slightly spatulated, 4 (4), and a short one, slightly lateral, 2(2). Prodorsal shield 52 (50–53), 70 (70–80) wide, subrectangular. Shield design includes two anterior subrectangular longitudinal cells; frontal lobe base extending into the anterior prodorsal shield as submarginal lines; a curved transversal line between scapular tubercles; prodorsal shield area, irregularly granulated. Frontal lobe 15 (14–15), 25 (22–25) wide, prominent, broad based, deeply emarginated, with acute lateral tip processes, also slightly granulated. Scapular seta (sc) 4 (4), 24 (22–25) apart, on small tubercles placed ahead of rear shield margin, directing seta backwards. Legs with all segments; lacking femoral seta (bv) on legs I and II, genual seta (l") on leg II, and tibial seta (l') on leg II. Leg I 37 (37–41); femur 11(10–11); genu 5 (4–5), genual seta (l") 34 (33–35); tibia 13 (12–13), tibial seta 5 (5–7); tarsus 7 (6–7), dorsal seta (ft') 21 (20–26), lateral seta (ft") 26 (24–26), unguinal seta (u') 5 (5–7), solenidion (ω) 9 (9–10) apically knobbed, empodium 8 (7–8), 8-rayed. Leg II 36 (36–39); femur 11 (10–12); genu 4 (4–5); tibia 11 (10–11); tarsus 6 (6), ft" 22 (22–24), ft' 5 (5–7), u' 5 (5–6), ω 9 (9–10) knobbed; empodium 7 (7– 9), 9-rayed, being the apical ray branched as the anterior ones. Coxae I and II with granules. Sternal line 10 (8–10). Coxal seta I (1b) absent; coxal seta II (1a) 9 (8–11), 18 (17–20) apart, coxal seta III (2a) 32 (32–37), 29 (28–36) apart. Genitalia 18 (18–23), 33 (33–36) wide, coverflap with 38 (31–38) longitudinal lines on the entire length; genital seta (3a) 11 (11). Opisthosoma dorsally with two submedian ridges convergent and fading above the level of ventral seta f, slight lateral ridges, 34 (33–37) dorsal annuli, with elongated microtubercles in the area between the ridges (about 6 first annuli), or restricted to the ridges (from annuli 7–12), and on the last 7–8 annuli (telosoma); 52 (51–54) ventral annuli, finely microtuberculated. Lateral seta (c2) 17 (17–20), on annulus 1 (1). Ventral seta I (d) 15 (15–18), on annulus 14 (12–14), 41 (40–46) apart, 40 (40–47) microtubercles apart; ventral seta II (e) 16 (14– 16), on annulus 31 (26–31), 18 (13–19) apart, 15 (13–19) microtubercles apart; ventral seta III (f) 36 (35–36), on annulus 46 (45–47), 28 (28–32) apart, 22 (22–30) microtubercles apart. Caudal seta (h2) 73 (70–78); accessory seta (h1), minute.

MALE (n=5). Smaller than female, 148–182, 66–79 wide. Gnathosoma as in female, 11–13; antapical seta 11–13. Prodorsal shield as in female, 48 (48–49), 70 (70–72) wide. Scapular seta (sc) 3–4 on tubercles, 21–26 apart. Frontal lobe as in female, 15(14–15), 24 (22–24) wide. Legs as in female. Leg I 35 –37; femur 10–11; genu 4–5, genual seta (l") 29–32; tibia 12–13, tibial seta (l') 5; tarsus 6, lateral seta (ft") 22–24, dorsal seta (ft') 20–23, unguinal seta (u') 5–6, solenidion (ω) 8–9, empodium 7–8, 9-rayed. Leg II 35 –36; femur 9–10; genu 4–5; tibia 10– 11; tarsus 6, ft" 22–23, ft' 6–7, u' 5–6, ω 8–9; empodium 7–8, 8-rayed. Coxae I and II smooth. Sternal line 9–10. Coxal seta I (1b) absent; coxal seta II (1a) 15–17, 8–12 apart; coxal seta III (2a) 29–30, 24–31 apart. Genitalia 13– 14, 18–20 wide; genital seta (3a) 9–11, without granules, eugential seta and design as figured. Opisthosoma as in female, 33–36 dorsal annuli; 43–48 ventral annuli. Lateral seta (c2) 15–17, on annulus 1. Ventral seta I (d) 14–16, on annulus 8–11, 31–36 apart, 25–33 microtubercles apart; ventral seta II (e) 11–13, on annulus 20–23, 11–15 apart, 9–13 microtubercles apart; ventral seta III (f) 30–34, on annulus 37–41, 25–29 apart, 21–24 microtubercles apart. Caudal seta (h2) 68–81; accessory seta (h1), minute.

Type material. Female holotype, 36 female and 15 male paratypes collected from banana, Musa acuminata Colla x Musa balbisiana Colla (genomic group AAB) ( Musaceae ), Recife, Pernambuco, Brazil. 08°01'07"S, 34°56'41"W, 0 4 April 2009, coll. A.C. Reis, on 10 microscope slides. Holotype and paratypes (34 specimens, 27 females and 7 males, on 7 microscope slides) deposited in the collection of the Departamento de Agronomia, Entomologia Agrícola. Universidade Federal Rural de Pernambuco, Recife, PE, Brazil. Paratypes (17 specimens, 9 females and 8 males on 3 microscope slides) deposited in the collection of the Laboratório de Quarentena Vegetal, Embrapa Recursos Genéticos e Biotecnologia, Brasília, DF, Brazil.

Relation to host. A vagrant species on the lower leaf surface. No damage symptoms were seen.

Etymology. The name asperulus is derived from Latin, asper, diminutive asperulus , meaning slightly rough and refers to the punctuation on the prodorsal shield.

Figures

FIGURE 3. Rhyncadicrus asperulus n. gen., n. sp. CGM. Coxigenital region, male; D. Dorsal habitus, female; em. Empodium, leg I, female; P. Palp; PT. Details of the palp tarsus setae; IG. Internal genital structures, female; LM. Lateral habitus, female LO. Lateral opisthosomal view of anterior section of mite; female; L 1. Leg I, female; L 2. Leg II, female; V. Ven t ral habitus, female.

FIGURE 4. Rhyncadicrus asperulus n. gen., n. sp. A. Dorsal habitus, female; B. Ventral habitus, female; C. Lateral habitus, female; D. Prodorsal shield with frontal lobe deeply emarginate, female; E. Epigynum; F. Internal genitalia, female; G. Genitalia, male; H. Palps, female; I. Detail of palp tarsus with distal setae; J, K. Legs I and leg II, female.