Eryngiopus moraesi Paktinat-Saeij & Barroso

Paktinat-Saeij, Saeid, Barroso, Geovanny & Cruz, Wilton Pires Da, 2017, Two new species of Stigmaeidae (Acari: Trombidiformes: Rhaphignathoidea) from Brazil, Zootaxa 4242 (2), pp. 372-382 : 376-378

Eryngiopus moraesi Paktinat-Saeij & Barroso sp. nov.

( Figs. 9–25 , 28–29 )

Diagnosis. Propodosomal shield finely striated; prodorsum with three pairs of setae, setae sce absent; suranal shield divided; dorsal setae slender and finely barbed. Aggenital shield divided by striae, ag1 and ag2–ag3 on separate platelets; seta g1 not reaching base of ps3. Femora I – II 4-4; genua I – II 3 (+1κ)-1; tarsi I – IV 12 (+1ω)- 8(+1ω)-6(+1ω)-6(+1ω).

Description. Female (n = 2): Length of idiosoma 271 (281); width of idiosoma 152 (154); gnathosoma (including palp) 90 (88); subcapitulum 55 (58); palp 59 (60); chelicera 60 (75). Length of legs I–IV (from base of coxa to tip of tarsal claw): 130 (137); 106 (110); 105 (111); 110 (117).

Dorsum of idiosoma ( Figs. 9 – 10 , 28 – 29 ). Idiosoma oval in dorso-ventral view; longitudinally striated. Propodosomal shield finely striated and reduced to one small weakly sclerotized shield, setae vi and ve on shield; setae sci on striated cuticle; setae sce absent; one pair of eyes present, pob absent ( Figs. 9 , 28 ). Setae c1, d1, e1, c2, d2 and e2 on striated cuticle. Intercalary shield divided into two minute platelets with one pair of seta f1. Suranal shield smooth, divided, with two pairs of setae (h1 and h2). Dorsal setae slender and finely barbed. Lengths of dorsal setae: vi 8 (10); ve 14 (15); sci 13 (14); c1 11 (13); c2 15 (17); d1 10 (11); d2 10 (11); e1 10 (11); e2 10 (11); f1 14 (15); h1 16 (20); h2 19 (20). Distances between dorsal setae: vi– vi 11 (9); ve–ve 32 (31); vi–ve 15 (17); ve–sci 29 (27); sci–sci 79 (68); c1–c1 56 (44); c1–d1 60 (68); c1–c2 50 (45); c2–c2 127 (119); c2–d2 71 (70); d1–d1 67 (54); d1–d2 39 (37); d1– e 1 46 (43); d2–d2 141 (118); d2– e 2 41 (41); e1– e 1 40 (36); e1– e 2 42 (37); e2–e2 104 (87); e1–f1 17 (23); f1–f1 46 (57); f1–h1 28 (24); h1–h1 23 (22); h1–h2 25 (24); h2–h2 65 (66). Ratios: vi / vi–vi 0.7 (1.1), c1 / c1–c1 0.2 (0.3), d1 / d1–d1 0.1 (0.2), e1 / e1– e 1 0.2 (0.3), f1 / f1–f1 0.3 (0.2); h1 / h1–h1 0.7 (0.9); c1–c1 / d1–d1 0.8 (0.8); c1–c1 / e1– e 1 1.4 (1.2); d1–d1 / e1– e 1 1.6 (1.5); h1 / h2 0.8 (1.0); c1–c1: d1–d1: e1–e1: f1–f1 = 1.4 (1.2): 1.6 (1.5): 1.0: 1.1 (1.5).

Venter of idiosoma ( Figs. 11 – 12 ). Ventral surface ornamented with striations; bearing three pairs of setae (1a, 3a and 4a). Aggenital shield divided by striae, ag1 and ag2–ag3 on separate platelets. Anogenital valves with one pair of genital (g1) setae and three pairs of pseudanal (ps1–3) setae. Seta g1 not reaching base of ps3. Setae ps1 slightly barbed. Measurements of setae: 1a 73 (66); 3a 62 (63); 4a 50 (42); ag1 12 (13); ag2 10 (12); ag3 12 (14); g1 15 (18); ps1 11 (11); ps2 12 (13); ps3 12 (13).

Gnathosoma. Subcapitulum ( Figs. 13 – 15 ) bearing subcapitular setae m 18 (16) and n 45 (37) and adoral setae or1 9 (10) and or2 11 (12). Distance m–m 25 (27), n–n 22 (23) and m–n 4 (4). Palpus ( Fig. 15 ), five segmented; palptrochanter without setae; palpfemur with three setae; palpgenu with one seta; palptibia with two tactile setae + one well-developed claw + one spine-like accessory claw; palptarsus with four tactile setae + one solenidion (ω), one subapical eupathidium and one distal trifid eupathidium.

Legs ( Figs. 11 , 16 – 19 ). Dorsalmost seta on femur I (dFI) barbed, 13 (14); dorsalmost seta on genu I (dGI) barbed, 11 (12). Chaetotaxy: coxae (excluding 1a, 3a and 4a) 2(+lelcl)-1-2-1, trochanters 1-1-1-1, femora 4-4-2-2, genua 3(+1κ)-1-0-0, tibiae 5(+1φp)-5(+1φp)-5(+1φp)-5(+1φp), tarsi 12(+1ω)-8(+1ω)-6(+1ω)-6(+1ω). Length of solenidia: ωI 6 (7); ωII 6 (7); ωIII 4 (5); ωIV 3 (4).

Male ( Figs. 20–25 ). Dimensions (n = 1): Length of idiosoma 245; width of idiosoma 132; gnathosoma (including palp) 76; subcapitulum 50; palp 52; chelicera 63. Length of legs I–IV (from base of coxa to tip of tarsal claw): 121; 100; 101; 104. Lengths of dorsal setae: vi 10; ve 14; sci 10; c1 11; c2 11; d1 9; d2 9; e1 9; e2 9; f1 11; h1 10; h2 15. Distances between dorsal setae: vi– vi 9; ve–ve 28; vi–ve 15; ve–sci 24; sci–sci 54; c1–c1 39; c1–d1 52; c1–c2 39; c2–c2 97; c2–d2 59; d1–d1 31; d1–d2 37; d1–e1 30; d2–d2 97; d2–e2 32; e1–e1 23; e1–e2 26; e2–e2 63; e1–f1 22; f1–f1 31; f1–h1 21; h1–h1 17; h1–h2 12; h2–h2 34. Measurements of setae: 1a 51; 3a 55; 4a 37; ag1 7; ag2 10; ag3 9; ps1 4; ps2 6; ps3 10.

Male similar to female but differs in that aggenital area with three pairs of setae (ag1–3) and an aedeagus visible ( Fig. 21 ), anogenital area without genital setae and with three pairs of pseudanal setae (ps1–ps3); tarsi I–II bear an extra solenidion ( Figs. 22–23 ).

Immature stages: Unknown.

Remarks. The new species closely resembles Eryngiopus yasumatsui Ehara & Wongsiri, 1984 and E. yemenensis Van Dis & Ueckermann, 1993 in having three pairs of setae on a part of the propodosoma (setae sce absent), three pairs of aggenital setae (ag1–3) and dorsal body setae finely barbed; however, it differs from the E. yasumatsui by: 1) tarsi 12(+1ω)-8(+1ω)-6(+1ω)-6(+1ω) in the new species instead of 14-10-8- 8 in the latter; 2) setae ag2 and ag3 sharing a platelet whereas on two separated platelets in the latter. Eryngiopus moraesi sp. nov. can be distinguished from E. yemenensis by the following characteristics: 1) femur I with four setae in the new species instead of five in E. yemenensis ; 2) having a suranal shield vs. absent in E. yemenensis ; 3) ventral setae 1a, 3a and 4a shorter than those of the latter; 4) setae g1 not reaching base of setae ps3 but surpassing in the latter.

Etymology. The species is named in honor of Prof. Gilberto José de Moraes (ESALQ- University of São Paulo, Brazil), for his great contribution to Acarology.

Type materials. Holotype female and one paratype female from leaves of Coconut trees ( Cocos nucifera L., Arecaceae ), 11 Dec. 2012 at experimental field Caldeirão in Iranduba city, state of Amazonas, Brazil were collected by Wilton Pires da Cruz ; one paratype female and one paratype male from leaves of Soursop trees ( Annona muricata L., Annonaceae ), 19 Apr. 2014 at Arapiraca city, state of Alagoas, Brazil were collected by Geovanny Barroso . All types are deposited in the Acarological collection of Departamento de Entomologia e Acarologia, ESALQ-USP, Piracicaba, São Paulo State, Brazil.

Figures

FIGURES 9 – 15. Eryngiopus moraesi Paktinat-Saeij & Barroso sp. nov. (Female). 9. Dorsal view of idiosoma, 10. Dorsal body seta ve, 11. Ventral view of idiosoma, 12. Ventral view of anogenital area, 13. Chelicera, 14. Subcapitulum (ventral), 15. Palp (dorsal).

FIGURES 16 – 19. Eryngiopus moraesi Paktinat-Saeij & Barroso sp. nov. (Female). 16. Leg I, 17. Leg II, 18. Leg III, 19. Leg IV.

FIGURES 20 – 25. Eryngiopus moraesi Paktinat-Saeij & Barroso sp. nov. (Male). 20. Dorsal view of idiosoma, 21. Ventral view of anogenital area, 22. Leg I, 23. Leg II, 24. Leg III, 25. Leg IV.

FIGURES 28 – 29. Eryngiopus moraesi Paktinat-Saeij & Barroso sp. nov. Dorsal view of idiosoma.