Gymnaceria cupuassu, Oliveira, Anibal R., Rodrigues, Daniela F. S. & Flechtmann, Carlos H. W., 2012

Oliveira, Anibal R., Rodrigues, Daniela F. S. & Flechtmann, Carlos H. W., 2012, A new eriophyoid mite genus and species, Gymnaceria cupuassu (Acari: Eriophyidae), described from the cupuaçu tree in Brazil, Zootaxa 3559, pp. 53-57 : 54-57

Gymnaceria cupuassu n. sp.

( Figs. 1–2 )

Diagnosis. As for the new genus above.

FEMALE (n=6). Body elongated, vermiform, 199 (137–205), from anterior end of shield to anal lobes, 43 (35–46) wide. Gnathosoma projecting obliquely downwards; basal seta (ep) 3 (2–3); antapical seta (d) 5 (4–5), simple and slightly geniculate; chelicera 13 (12–17). Prodorsal shield subtriangular, 23 (20–26) long, 34 (27–34) wide; median line (m) incomplete, prominent in posterior 2/3 of shield, frequently interrupted in middle; admedian lines (ad) complete, slightly diverging towards rear and somewhat recurved inward posteriorly; first and second submedian lines (sm1 and sm2) incomplete, converging posteriorly, running from anterior margin to middle of shield. Lateral side of shield with short lines and granules. Scapular tubercles near posterior margin of shield, 13 (8–14) apart; scapular seta (sc) 19 (18–21), directed posteriorly and divergent. Coxisternal region. Internal coxisternal apodeme conspicuous, 6 (6–8). Coxal seta I (1b) 7 (6–7), 8 (7–9) apart; coxal seta II (1a) 17 (13–18), 8 (6–8) apart; coxal seta III (2a) 36 (20–39), 18 (14–18) apart; coxisternal area with 5 (4–7) annuli separating coxae from genital coverflap, microtuberculate. Legs with all segments and usual setae present. Leg I 26 (24–29); femur 9 (9–10), femoral seta (bv) 9 (7–9); genu 4 (3–4), genual seta (l") 18 (16–20); tibia 5 (4–6), tibial seta (l') 6 (4–6); tarsus 6 (5–8), lateral seta (ft") 18 (18–20), dorsal seta (ft') 13 (9–15), unguinal seta (u') 2 (2–4), solenidion (ω) 8 (7–9); empodium 6 (4–6), 6-rayed, each ray (except first) further divided into two branches each. Leg II 22 (20–26); femur 9 (7–9), bv 8 (6–8); genu 3 (3–5), l" 5 (4–7); tibia 3 (3–4); tarsus 5 (5–6), ft" 17 (16–20), ft' 4 (3–5), u' 4 (2–4), ω 10 (9–11); empodium 5 (4–7), 6 (5–6) rayed. External genitalia 9 (9–13) long, 18 (16–19) wide, with 15 (10–15) longitudinal ribs; genital seta (3a) 9 (7–10). Opisthosoma with 72 (71–82) dorsal annuli and 65 (61–70) ventral annuli. Annuli mostly continuous dorsoventrally, microtuberculated and subequal in most of opisthosoma, except in 12–15 posterior annuli which are smooth and broader dorsally. Lateral seta (c2) 17 (14–20), on annulus 4 (3–5); ventral seta I (d) 45 (30–50), on annulus 16 (12–17), 34 (29–36) apart; ventral seta III (f) 17 (14–17), on annulus 6 (5–6), 13 (11–13) apart; caudal seta (h2) 50 (48–54); accessory seta (h1) 3 (3–4). Dorsal seta (c1) and ventral seta II (e) absent.

MALE (n=3). Generally smaller than female, body 104–144 long, 33–48 wide. Gnathosoma ep 2, d 4, chelicera 8–12. Prodorsal shield 19–31 long, 26–33 wide; sc 13–18, 10–12 apart. Coxisternal region. Internal coxisternal apodeme 6–7; 1b 5–6, 7–8 apart; 1a 10–13, 6–7 apart; 2a 20–28, 13–17 apart; 5–7 coxisternal annuli. Legs. Leg I 20–25; femur 7–11, bv 6–10; genu 4, l" 13–19; tibia 4–5, l' 3–5; tarsus 5–6, ft" 11–14, ft' 10–13, u' 2, ω 6–7; empodium 4–5, 6-rayed. Legs II 18–22; femur 6–8, bv 5–6; genu 2–3, l" 4–5; tibia 3; tarsus 4–5, ft" 12–17, ft' 3–4, u' 2–3, ω 7–10; empodium 4–5, 6-rayed. External genitalia 8–10 long, 12–15 wide; 3a 4–9. Opisthosoma with 64–72 dorsal annuli and 55–61 ventral annuli. c 2 14–17, on annulus 1; d 31–37, on annulus 13, 25–27 apart; f 14–15, on annulus 6, 10–11 apart. h2 40–65; h1 4. c1 and e absent.

NYMPH (n=4). Body 101–112 long, 36–39 wide. Gnathosoma ep 2, d 3–4, chelicera 10–14. Prodorsal shield 21–23 long, 29–36 wide; sc 12–14, 11–12 apart. Coxisternal region. Internal coxisternal apodeme 4–5; 1b 4–7, 3–6 apart; 1a 5–9, 4–6 apart; 2a 12–19, 10–12 apart. Legs. Leg I 15–17; femur 4–7, bv 3–4; genu 3–4, l" 11–13; tibia 3–4, l' 3–5; tarsus 3–5, ft" 11, ft' 5–10, u' 1–2, ω 5–6; empodium 3, 5-rayed. Legs II 12–15; femur 4–5, bv 3–4; genu 2–3, l" 3 –4; tibia 2–3; tarsus 3–4, ft" 13–14, ft' 2–3, u' 1, ω 7–8; empodium 3, 5-rayed. Genitalia absent. Opisthosoma with 74–78 dorsal annuli and 46–53 ventral annuli posterior to seta 3a; 11 annuli anterior to seta 3a; 3a 3–4, on annulus 12; c 2 7–11, on annulus 12–14; d 20–29, on annulus 24–28, 24–25 apart; f 10–12, on annulus 5–6, 9–11 apart. h 2 25–29; h1 2–3. c1 and e absent.

LARVA (n=2). Body 80–82 long, 23–32 wide. Gnathosoma ep 1, d 2–3, chelicera 13–14. Prodorsal shield 15–16 long, 20–22 wide; sc 13. Coxisternal region 1a 5–9; 2a 8–10. Legs. Leg I 11; femur 4, bv 3–4; genu 2, l" 11; tibia 2, l' 2; tarsus 3, ft" 9, ft' 7–8, u' 1, ω 5–6; empodium 3, 5-rayed. Leg II 9–10; femur 4–5, bv 3; genu 1–2, l" 4; tibia 1–2; tarsus 2–3, ft" 7–10, ft' 2, u' 1, ω 5–8; empodium 2–3, 5-rayed. Genitalia absent. Opisthosoma with 74–76 dorsal annuli and 46 ventral annuli posterior to seta 3a; 10 annuli anterior to seta 3a; 3a 2, on annulus 11; c2 3–4, on annulus 12–13; d 7–8, on annulus 22, 16 apart; f 9–10, on annulus 4, 6–8 apart. h 2 16–17; h1 2; c1 and e absent.

Type material. Female holotype and about 700 paratypes, including females, males, nymphs and larvae collected from immature fruits, buds, flowers, young leaves and branches of Theobroma grandiflorum, Ilhéus , Bahia, Brazil. Six microscopic slides with specimens collected from the campus of the UESC, 14o47'S, 39o16'W on 8 December 2011 and 28 September 2012, coll. A.R. Oliveira, and four microscopic slides with specimens collected from the campus of the CEPLAC, 14o45'S, 39o13'W on 19 December 2011, coll. A.R. Oliveira. Holotype and 6 slides with about 400 paratypes deposited in the collection of the Acari at UESC. Four slides with about 300 paratypes deposited in the collection of Departamento de Entomologia e Acarologia, Universidade de São Paulo, ESALQ, Piracicaba, São Paulo, Brazil.

Host plant. Theobroma grandiflorum (Willd. Ex Spreng.) K. Schum. ( Sterculiaceae ).

Relation to host. A vagrant species found mainly on immature fruit. It also occurs on buds, flowers, young leaves and branches with abundant trichomes. No mites were found on older fruits, leaves or branches.

Etymology. The epithet cupuassu is derived from ‘cupuaçu’. This is the local common name of the fruit of the host plant, T. grandiflorum , which has been latinized.

Figures

FIGURE 1. Gymnaceria cupuassu n. gen. et n. sp., female. D. Dorsal habitus; V. Ventral habitus.

FIGURE 2. Gymnaceria cupuassu n. gen. et n. sp. L. Lateral habitus, female; OL. Opisthosoma lateral, female; E. Ven t ral view of empodium, Leg I, female; IGF. Internal genitalia, female; GM. External genitalia, male; L 1. Leg I, antiaxial view, female; L 2. Leg II, antiaxial view, female.