Reginesus macuxi, Reis, Aleuny C., Gondim, Manoel G. C., Navia, Denise & Flechtmann, Carlos H. W., 2012

Reis, Aleuny C., Gondim, Manoel G. C., Navia, Denise & Flechtmann, Carlos H. W., 2012, Eriophyoid mites (Acari: Prostigmata: Eriophyoidea) on palms (Arecaceae) from the Brazilian Amazon: a new genus and four new species, Zootaxa 3446, pp. 49-59 : 50-52

Reginesus macuxi n. gen. n. sp. Reis & Navia

( Fig. 1 )

FEMALE (n=10). Body fusiform, 151 (136–151), 68 (58–68) wide; Gnathosoma downcurved, 19 (18–22); basal seta (ep) 2 (2–3); antapical seta (d) 4 (4–5) long, not branched, angled as in Fig. 1 ; chelicerae 15 (13–15) long; oral stylets 14 (12–14) long. Prodorsal shield 50 (47–52), 58 (57–63) wide, subpentagonal. Scapular setae (sc) 7 (6–7) long, on tubercles, 22 (18–22) apart. Frontal lobe 6 (5–6), 15 (15–17), wide-based, subtriangular. Shield design with submedian lines in the 2/3 posterior shield, resembling a volumetric flask; four or more open cells filled with irregular tortuous lines in the lateral areas; anterior area delimitated by an emarginated longitudinal line and also filled with irregular lines. Legs with all segments present; lacking femoral seta (bv) and tibial seta (l') on legs I and II, and genual seta (l ʺ) on leg II. Leg I 22 (20–24); femur 9 (8–10); genu 3 (3–4), genual seta (l") 20 (20–22); tibia 2 (1–2); tarsus 4 (4–5), lateral seta (ft") 16 (16–18), dorsal seta (ft') 14 (12–14), unguinal seta (u ′) 3 (3), solenidion (ω) 4 (4), empodium simple 4 (4), 4-rayed, apically bifurcate. Leg II 17 (16–19); femur 7 (6–8); genu 2 (2–3); reduced tibia, 1 (1–2); tarsus 5 (4–5), ft" 12 (11–13), ft' 5 (4–5), u' 3 (2–3), ω 4 (4); empodium simple 4 (4), 4- rayed. Coxae of legs I are fused. Prosternal apodeme absent. Coxal I and II smooth. Coxal seta I (1b) 6 (6–7) long, 13 (13–17) apart; coxal seta II (1a) 20 (14–20) long, 6 (6–8) apart; coxal seta III (2a) 18 (17–20) long, 28 (24–30) apart. Genitalia 10 (10–12), 22 (18–22) wide, epigynum with 11 (10–14) longitudinal and/or radial lines, and anterior region with 3 transversal lines; genital seta (3a) 6 (5–7). Coxi-genital annuli not seen. Opisthosoma with three dorsal longitudinal ridges, middorsal ridge extending over a few annuli past half of opisthosoma (almost over first 15 annuli) and two lateral ridges fading on the level dorsad of the ventral seta III (f), 31 (29–31) dorsal annuli; microtubercles absent on the first dorsal annuli (or at least the three first annuli), except in their lateral area; elongated microtubercles distributed on the ridges and lateral area, except on the last annuli (4–5 last annuli) that are completely microtuberculated; 57 (52–57) ventral annuli, finely microtuberculated. Lateral seta (c2) 10 (9–10), on annulus 1. Ventral seta I (d) and II (e) absent; ventral seta III (f) 12 (12–13), on annulus 51 (46–51), 14 (14) apart, 17 (15–17) microtubercles apart. Caudal seta (h2) broken in the holotype and all paratypes; accessory seta (h1) absent.

MALE (n=5). Smaller than female, 115–140, 48–52 wide. Gnathosoma 15–18; basal seta (ep) 2–3; antapical seta (d) 5; chelicerae 12. Prodorsal shield as in female, 40–45, 47–50 wide. Scapular seta (sc) 5–6 long, 17–19 apart. Frontal lobe 5, 14–15 wide. Legs as in female. Leg I 17–19; femur 7–8; genu 3, genual seta (l") 18–20; tibia 1–2; tarsus 4, lateral seta (ft") 14–15, dorsal seta (ft') 10–12, unguinal seta (u') 2–3, solenidion (ω) 4; empodium simple 4, 4-rayed. Leg II 14–15; femur 6; genu 1–2; tibia 1; tarsus 3–4, ft" 11, ft' 4–5, u' 2–3, ω 4; empodium 4- rayed (3 and 4-rayed were observed in some specimens; the illustration in Fig. 1 represents the holotype state which was more common). Coxae as in female. Prosternal apodeme absent. Coxal seta I (1b) 5–7, 10–11 apart; coxal seta II (1a) 12–16, 4–5 apart; coxal seta III (2a) 13–15, 18–22 apart. Genitalia 10–12, 14–15 wide, eugenital setae as figured; genital seta (3a) 5–6. With three incomplete smooth coxi-genital annuli. Opisthosoma as in female, 25–30 dorsal annuli; 44–52 ventral annuli. Lateral seta (c2) 7–10, on annulus 1. Ventral seta III (f) 11–13, on annulus 39–46, 12–14 apart, 16–21 microtubercles apart. Caudal seta (h2) broken; accessory seta (h1) absent.

Type material. Female holotype, 21 female and 6 male paratypes, from Bactris aff. maraja Mart. (Arecaceae) , Campo Experimental Confiança, Embrapa, Cantá, Roraima, Brazil, 02°35'40.8"N, 60°29'10.51"W, 0 6 August 2008 collected by Ranyse Barbosa Querino da Silva, on 9 microscope slides. Holotype and paratypes (21 specimens: 15 females and 6 males on 7 microscope slides) deposited in the collection of the Laboratório de Acarologia, Departamento de Agronomia, Universidade Federal Rural de Pernambuco, Recife, PE, Brazil. Paratypes (6 specimens: 6 females on 2 microscope slide) deposited in the collection of the Laboratório de Quarentena Vegetal, Embrapa Recursos Genéticos e Biotecnologia, Brasília, DF, Brazil.

Relation to host plant. No damage symptoms were seen.

Etymology. The specific designation macuxi is the name of a sub-group of the Pemon (Caribbean and Northern Brazilian) indigenous group, which is also used to designate the inhabitants of the State of Roraima, the northern-most State of Brazil. Thus, it is the Reginesus from Roraima.

Figures

FIGURE 1. Reginesus macuxi n. gen., n. sp. CGM. Coxigenital region, male; D. Dorsal habitus, female; em. Empodium, leg I, female; LM. Lateral habitus, female; LO. Lateral opisthosomal view of anterior section of mite; L 1. Leg I, female; L 2. Leg II, female; V. Ventral habitus, female.