Nasuchus socratea, 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 : 52-54

Nasuchus socratea n. sp. Reis & Navia

Eriophyidae , Phyllocoptinae , Acaricalini ( Fig. 2 )

Diagnosis. Nasuchus socratea n. sp. is the second species assigned to this genus. It is distinctive from the type species, Nasuchus pindobates Navia & Flechtmann 2002 , in the prodorsal shield and epigynum ornamentation as well as in the number of empodial rays. It is similar to N. pindobates in the tripartite empodium (two lateral rayed branches and a central one that is bifurcated apically). However, in the new species, each lateral branch of the empodium is 3-rayed while in N. pindobates they are 5-rayed. It also differs from the type species in the presence of longitudinal lines on the epigynum (smooth in N. pindobates ). The relief of the prodorsal shield of the new species is generally similar to that of N. pindobates . However, in the new species, elevations of the latero-posterior area are much more pronounced. The new taxon presents a prodorsal shield that is entirely covered with irregular, longitudinal or transversal lines. However, in N. pindobates , this ornamentation is absent.

FEMALE (n=10). Body fusiform, 156 (134–158), 75 (56–79) wide; Gnathosoma downcurved, 22 (18–23); basal seta (ep) 3(2–3); antapical seta (d) 5 (5–6) long, not branched; chelicerae 15 (15–17). Prodorsal shield 69 (68–74), 66 (55–78) wide, subpentagonal. Scapular setae (sc) 7 (6–7) on prominent transversal tubercles placed ahead of rear shield margin and directed upwards, 20 (13–21) apart. Frontal lobe 18 (13–18), 48 (37–48) wide, broad-based, emarginated, with some transversal rows of granules on the apical area. Anterior shield divided into two lobes by a longitudinal median line, filled out with irregular and curved transversal lines. Shield design consisting of open rounded cells and also covered with a series of longitudinal or diagonal irregular lines; median line in the posterior shield bifurcated in the proximal area. Shield with remarkable relief, consisting of two lateroposterior hump-like elevations which project towards the opisthosomal lateral ridges; and having a middorsal elevation which is less pronounced than the lateral ones and also projecting towards the opisthosoma. Legs with all segments present; lacking femoral seta (l") on legs I and II, and tibial seta (l') on leg II. Leg I 26 (24–26); femur 13 (11–13); genu 4 (3–4), genual seta (l") 24 (20–25); tibia 5 (5–6), tibial seta (l') 19 (17–19); tarsus 5 (4–5), lateral seta (ft") 18 (16–18), dorsal seta (ft') 16 (14–16), unguinal seta (u') 3 (3–4), solenidion (ω) 4 (4–5), empodium 4 (4–5), divided into two 3-rayed lateral branches and a central one, not rayed, apically bifurcated. Leg II 23 (21–24); femur 10 (9–11); genu 3 (3), l" 21 (17–21); tibia 4 (3–4); tarsus 4 (4), ft" 16 (13–16), ft' 4 (4), u' 3 (3–4), ω 4 (4); empodium 4 (4), as in Leg I. Coxae I and II without granules. Prosternal apodeme 7 (6–7). Coxisternal region with 5 (5) annuli, smooth. Coxal seta I (1b) 7 (7–9) long, 13 (11–15) apart; coxal seta II (1a) 16 (16–20) long, 8 (6–9) apart; coxal seta III (2a) 27 (23–27) long, 27 (24–37) apart. Genitalia 15 (13–15), 23 (18–23) wide, epigynum with two rows of longitudinal lines; proximal row with 13 (11–13) longitudinal lines and distal row with 3 longitudinal lines in median area; genital seta (3a) 8 (7–8). Opisthosoma 37 (33–37) dorsal annuli, without microtubercles. First opisthosomal dorsal annuli (or about first five) fused into a plate, with striated lateral lobes. Three dorsal longitudinal ridges present; central ridge extending over anterior half of opisthosoma and two lateral ridges extending until level dorsad of ventral seta III (f); granulated area in antero-ventral opisthosoma; 60 (60–68) ventral annuli, with slightly elongated microtubercles restricted to median ventral area. Lateral seta (c2) and ventral seta II (e) absent. Ventral seta I (d) 14 (14–15), on annulus 14 (14–17), 29 (24–30) apart, 22 (18–24) microtubercles apart; ventral seta III (f) 15 (13–15), on annulus 56 (56–64), 19 (14–19) apart, 16 (15–20) microtubercles apart. Caudal seta (h2) 33 (33-35); accessory seta (h1) absent.

MALE (n=5). Smaller than female, 131–137, 57–63 wide. Gnathosoma 18–21; basal seta (ep) 3; antapical seta (d) 4–5; chelicerae 12–13. Prodorsal shield as in female, 60–65, 55–61 wide. Scapular seta (sc) 4–5, 12–15 apart. Legs as in female. Leg I 24–26; femur 10–12; genu 3; tibia 4–5, tibial seta (l') 13–18; tarsus 4, lateral seta (ft") 13–15, dorsal seta (ft') 13–14, unguinal seta (u') 3–4, solenidion (ω) 4; empodium divided 4, 3-rayed. Leg II 19–21; femur 9–10; genu 3; tibia 4; tarsus 3–4, ft" 11–13, ft' 3–4, u' 3, ω 4; empodium 4, 3-rayed. Coxae as in female. Prosternal apodeme 6. Coxal seta I (1b) 7, 11–12 apart; coxal seta II (1a) 15–16, 6–8 apart; coxal seta III (2a) 17–20, 22–25 apart. Genitalia 8–10, 14–16 wide, eugenital setae as figured; genital seta (3a) 7. Opisthosoma as in female, 33–36 dorsal annuli; 54–58 ventral annuli. Lateral seta (c2) absent. Ventral seta I (d) 11, on annulus 12–14, 20–23 apart, 14–16 microtubercles apart; ventral seta III (f) 11–13, on annulus 51–54, 11–15 apart, 17–20 microtubercles apart. Caudal seta (h2) 26; accessory seta (h1) absent.

Type material. Female holotype from Socratea exorrhiza (Marth), 23 female and 6 male paratypes, from Socratea exorrhiza (Mart.) H. Wendl and Bactris gasipaes Kunth (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 8 microscope slides. Holotype and paratypes (24 specimens: 19 females and 5 males on 6 microscope slides) deposited in the collection of the Laboratório de Acarologia, Departamento de Agronomia, Universidade Federal Rural de Pernambuco, Recife, PE, Brazil. Paratypes (5 specimens: 4 females and 1 male on 2 microscope slides) 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 “ socratea ” refers to Socratea , the host plant genera on which the holotype was found. It was coined by apposition.

Figures

FIGURE 2. Nasuchus socratea 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.