Thamnacus paubrasil Reis and Navia, 2014

Reis, Aleuny Coutinho, Jr, Manoel Guedes Corrêa Gondim, Flechtmann, Carlos Holger Wenzel & Navia, Denise, 2014, New eriophyoid mites (Acari: Prostigmata: Eriophyoidea) from cultivated plants from northeastern Brazil, including the second taxon in the Prothricinae, Journal of Natural History 48 (19), pp. 1135-1152 : 1144-1148

Thamnacus paubrasil Reis and Navia , sp. nov.

( Figures 5 and 6 )

Diagnosis

Thamnacus sp nov. is distinct in having a short posterior lobe extending over the first opisthosomal annulus; dorsal opisthosoma with transverse thickened bands; coverflap with granules on the proximal area and longitudinal and radial lines. It differs from T.separabilis Huang, 2001 and T.vacuus Huang, 2001 in the smooth dorso-opisthosomal annuli (microtuberculated in these species). It also differ from other Thamnacus species in the six-rayed empodium (six paired and one unpaired apical in T.euphorbiae Channabasavanna, 1966 , five-rayed in T.acanthae Umapathy, 1999 , seven-rayed in T.elaeagnae Umapathy, 1999 , and four-rayed in T.rhamnicolus ( Keifer, 1938) , T. solani Boczek and Michalska, 1989 , T.separabilis and T.vacuus ).

Female (n = 10)

Body fusiform, 155 (143–179), 51 (49–60) wide; Gnathosoma down-curved, 21 (20– 22); basal seta (ep) 2 (2–3); antapical seta (d) 5 (4– 5) long, not branched. Prodorsal shield 38 (38–41), 49 (44–54) wide, smooth, with a posterior lobe (or projection) extending over the first 1–2 opisthosomal annulus. Scapular seta (sc) 16 (14–16), on prominent tubercles, starting a little under the posterior lobe, 22 (21–24) apart. Frontal lobe broad-based, apically rounded with three spines, 6 (6– 7), 17 (17–20) wide. Legs with all segments; all setae present except for tibial seta (l') on leg II. Leg I 25 (24–26); femur 8 (7–9), femoral seta (bv) 7 (7–9); genu 4 (4– 5), genual seta (l ″) 20 (18–21); tibia 5 (4–5), tibial seta (l ′) 5 (4–6); tarsus 5 (4–6), lateral seta (ft ″) 12 (12–20), dorsal seta (ft ′) 14 (14–16), unguinal seta (u ′) 4 (4–5), solenidion (ω) 9 (9–10), blunt, empodium simple 5 (5–6), six-rayed, apically bifurcate. Leg II 22 (21–24); femur 8 (6–8), bv 7 (7–8); genu 4 (3–4), l ″ 5 (5–6); tibia 3 (3–4); tarsus 5 (4–5), ft ″ 18 (16–18), ft' 5 (5–6), u ′ 3 (3–4), ω 9 (9); empodium simple 5 (5–6), six-rayed. Coxae I with irregular lines. Sternal line 6 (5–6). Coxigenital region with 3 (3) annuli, microtuberculated. Coxal seta I (1b) 6 (5–6), 9 (9–13) apart; coxal seta II (1a) 13 (13–16), 7 (7–11) apart; coxal seta III (2a) 29 (26–33), 18 (18–23) apart. Genitalia 13 (11–13), 15 (15–18) wide; coverflap with granules on the proximal area and 7 (7–8) longitudinal and radial lines of unequal length near posterior margin; genital seta (3a) 11 (11–14). Opisthosoma 20 (20–21) dorsal annuli, broad, without microtubercles, with a longitudinal middorsal ridge and two lateral ridges fading above the level of ventral seta III (f). Ventral annuli with elongated microtubercles, 48 (46–53). Lateral seta (c 2) 16 (16–20), on annulus 4 (3–4). Ventral seta I (d) 40 (35–44), on annulus 16 (15– 17), 28 (28–39) apart, 19 (19–22) microtubercles apart; ventral seta II (e) 10 (8– 11), on annulus 30 (27–31), 13 (13–19) apart, 7 (7–11) microtubercles apart; ventral seta III (f) 13 (13–15), on annulus 44 (42–49), 10 (10–12) apart, 9 (7–9) microtubercles apart. Caudal seta (h 2) 43 (43–54); accessory seta (h 1) 2 (1–2).

Male (n = 5)

Smaller than female, 121–136, 44–49 wide. Gnathosoma 17–21; basal seta (ep) 3 (2– 3); antapical seta (d) 3–4; chelicerae 15–16. Prodorsal shield as in female, 33–37, 41– 42 wide. Scapular seta (sc) 12–14, 18–19 wide. Legs as in female. Leg I 22–24; femur 7–8, femoral seta (bv) 6–7; genu 16–18, genual seta (l ″) 4–5; tibia 4–5; tarsus 5, lateral seta (ft ″) 16–17, dorsal seta (ft ′) 14–15, unguinal seta (u ′) 3–4, solenidion (ω) 8–9; empodium simple 5–6, six-rayed. Leg II 20–23; femur 7–8, bv 6–7; genu 3, l ″ 4– 5; tibia 3–4; tarsus 5, ft ″ 15–16, ft ′ 5, u ′ 3, ω 9–10; empodium 5–6, six-rayed. Coxae as in female. Sternal line 5–6. Coxisternal region with 3–4 annuli, with granules. Coxal seta I (1b) 5, 8–9 apart; coxal seta II (1a) 12–13, 6–9 apart; coxal seta III (2a) 27–31, 15–19 apart. Genitalia 9–10, 12 wide, eugenital setae as figured; genital seta (3a) 9–10. Opisthosoma as in female, 20–21 dorsal annuli; 37–41 ventral annuli. Lateral seta (c 2) 17–19, on annulus 2–3. Ventral seta I (d) 30–35, on annulus 10–12, 24–26 apart, 15–19 microtubercles apart; ventral seta II (e) 7–8, on annulus 20–23, 11–12 apart, 7–9 microtubercles apart; ventral seta III (f) 11–12, on annulus 33–37, 9–11 apart, 7–9 microtubercles apart. Caudal seta (h 2) 31–48; accessory seta (h 1) 1–2.

Type material

Female holotype, 15 female and six male paratypes, from Caesalpinia echinata Lam. (Caesalpiniaceae) , Recife, Pernambuco, Brazil, 08°01 ′ 07 ″ S, 34°56 ′ 41 ″ W, 15 October 2009, collected by A.C. Reis, on five microscope slides. Holotype and paratypes (16 specimens, 11 females and five males, on three microscope slides) deposited in the collection of the Laboratório de Acarologia, Departamento de Agronomia, Universidade Federal Rural de Pernambuco, Recife, PE, Brazil. Paratypes (five specimens, four females and one male, on two microscope slides) also deposited in the collection of Embrapa Recursos Genéticos e Biotecnologia, Brasília, DF, Brazil.

Relation to host

No visible damage.

Etymology

The specific name “ paubrasil ” refers to the common name given to the host plant, Caesalpinia echinata .

Redescription

Figures

Figure 5. Thamnacus paubrasil sp. nov. CGM, coxigenital region, male; D, dorsal habitus, female; em, empodium, leg I, female; LM, lateral habitus, female; L1, leg I, female; L2, leg II, female; V, ventral habitus, female.

Figure 6. Thamnacus paubrasil sp. nov. (A) Dorsal habitus, female; (B) ventral habitus, female; (C) lateral habitus, female; (D) leg I and II, female; (E) epigynum; (F) genitalia, male; (G) empodium, female.