Eustigmaeus oliveirai Paktinat-Saeij & Bagheri

Paktinat-Saeij, Saeid, Bagheri, Mohammad, De Castro, Tatiane M. M. G. & De Moraes, Gilberto J., 2016, Two new species of Eustigmaeus Berlese (Acari: Trombidiformes: Stigmaeidae) from Brazil, with a key to the American species, Zootaxa 4066 (5), pp. 571-580 : 574-577

Eustigmaeus oliveirai Paktinat-Saeij & Bagheri sp. nov.

( Figs. 11–18 , 20 )

Female (n = 4): Length of idiosoma 257 (252–275); length of gnathosoma with palp 112 (110–117); width of idiosoma 211 (207–224). Length of legs I–IV (from base of coxa to tip of tarsal claw): 173 (168–175); 161 (150– 162); 160 (150–154); 176 (172–180).

Dorsum of idiosoma ( Figs. 11 , 20 ). Almost completely covered by two shields. Shields ornamented with polygonal depressions of variable sizes and fine punctation; without callosities between idiosomal shield and humeral shield. Prodorsal shield bearing four pairs of setae (vi, ve, sci and sce) and one pair of eyes between setae ve and sci. Humeral shield broad, subtriangular, ornamented with depressions and bearing c2. Hysterosomal shield with six pairs of setae (c1, d1, d2, e1, e2 and f1). Dorsal body setae situated on protuberances, subequal, smooth, arcuate, feather-like and with midrib, vi and sci with short spikes ( Fig. 12 , 20 ). Lengths of dorsal setae: vi 53 (52– 54); ve 70 (67–68); sci 51 (48–53); sce 53 (52–55); c1 55 (52–58); c2 52 (54–56); d1 68 (62–65); d2 62 (57–59); e1 60 (60–62); e2 54 (55–56); f1 52 (56–59); h1 30 (35–37); h2 28 (29–30). Distances between dorsal setae: vi– vi 12 (8–12); ve–ve 74 (65–75); vi–ve 29 (24–27); ve–sci 25 (22–23); sci–sci 115 (103–112); sce–sce 154 (145–156); sci–sce 35 (38–40); c1–c1 62 (58–62); c1–d1 38 (39–40); c1–c2 70 (56–87); c1–d2 60 (58–62); c2–c2 177 (173– 197); d1–d1 58 (56–58); d1–d2 58 (60–61); d1– e1 67 (62–64); d1– e2 58 (52–55); d2–d2 178 (167–170); d2– e2 62 (58–61); e1– e1 81 (70–74); e1– e2 35 (33–34); e2–e2 136 (122–130); e1–f1 32 (29–32); f1–f1 60 (56–58); h1–h1 30 (26–29); h2–h2 65 (55–63); h1–h2 18 (17 – 18).

Venter of idiosoma ( Fig. 13 ). Endopodal shields fused medially, reticulate and punctate, except for central region of posterior endopodal shield, punctate only; bearing three pairs of setae (1a, 3a and 4a); anogenital area reticulate and punctate, but anal valves smooth; with one pair of aggenital (ag1) and three pairs of pseudanal (ps1– 3) setae. Suranal shield situated ventrally, with depressions and punctate, bearing h1 and h2. Measurements of setae: 1a 16 (15–16); 3a 16 (15–17); 4a 15 (12–14); ag 15 (12–14); ps1 12 (13–14); ps2 12 (11–12); ps3 11 (11– 13).

Gnathosoma. Subcapitulum ( Fig. 14 ) with dimples and fine punctations, bearing subcapitular setae m 14 (15– 16) and n 12 (10–11), and adoral setae or1 11 (11) and or2 12 (11–12). Distance m–m 20 (20), n–n 21 (21). Palpus 77 (67–74) long ( Fig. 14 ), palptrochanter without setae; palpfemur with three setae; palpgenu with two setae; 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. 15–18 ). Setation: coxae (excluding 1a, 3a and 4a) 2-2-2-2, trochanters 1-1-2-1, femora 6-5-3-2, genua 3(+1κ)-3-1-1, tibiae 5(+1φ+1φρ)-5(+1φ)-5(+1φ)-5(+1φ), tarsi 13(+1ω)-9(+1ω)-7(+1ω)-7. Length of solenidia: ωI 23 (21–23); ωII 15 (16–17); ωIII 8 (7–8); φI 7 (7); φρI 11 (12–13); φII 8 (9–10); φIII 7 (7). φIV 7 (6– 7).

Immature stages and male: Unknown.

Remarks: This new species belongs to the “ segnis ” group, therefore it resembles Eustigmaeus arcuata Chaudhri, 1965 , E. chilensis Chaudhri, 1965 , E. ensifer Tseng, 1982 , E. floridensis Maake, Ueckermann & Childers, 2015 , E. foliaceus Tseng, 1982 , E. microsegnis Chaudhri, 1965 and E. segnis ( Koch, 1836) in having one pair of aggenital setae, flattened dorsal body setae, five setae on femur II and three setae on genu II; it can be distinguished from those species by the following combination of characters: tarsus II with 9(+1ω) setae [8(+1ω) setae in E. arcuata , E. chilensis and E. segnis ]; endopodal shields reticulate (smooth in E. chilensis , E. floridensis and E. foliaceus ); most of the dorsal body setae smooth (barbed in E. arcuata , E. ensifer , E. floridensis , E. microsegnis and E. segnis ); dimples of dorsal shields without vacuoles (with vacuoles in E. microsegnis and E. segnis ); anogenital area reticulate (smooth in E. ensifer , E. floridensis and E. foliaceus ); lacking callosity (present in E. foliaceus ). Furthermore, the new species differs from E. chilensis by having vi and sci with barbs.

Etymology. The species is named in honor of A.R. Oliveira (Brazilian acarologist, Departamento de Ciencias Biologicas, Universidade de Santa Cruz, Ilheus, Bahia State, Brazil), for his contribution to Acarology in Brazil.

Type material. Holotype female and three paratype females from soil and humus under unidentified tree, collected on January 17, 2000 at Pariquera-Açu, state of São Paulo State, Brazil, by A.R. Oliveira. The holotype female and two paratype females are deposited at the mite reference collection of Departamento de Entomologia e Acarologia, ESALQ-USP, São Paulo State, Brazil. One paratype female deposited at the Acarological Collection, Department of Plant Protection, Faculty of Agriculture, University of Maragheh, Maragheh, Iran.

Figures

FIGURES 11 – 14. Eustigmaeus oliveirai Paktinat-Saeij & Bagheri sp. nov. (Female): 11. Dorsal view of idiosoma, 12. Dorsal setae, 13. Ventral view of idiosoma, 14. Gnathosoma: Subcapitulum (Ventral view), Palp (Dorsal view).

FIGURES 15 – 18. Eustigmaeus oliveirai Paktinat-Saeij & Bagheri sp. nov. (Female): 15. Leg I, 16. Leg II, 17. Leg III, 18. Leg IV.

FIGURES 19 – 22. 19. Eustigmaeus piracicabensis Paktinat-Saeij & Bagheri sp. nov. (Female): Dorsal view of idiosoma, 20. Eustigmaeus oliveirai Paktinat-Saeij & Bagheri sp. nov. (Female): Dorsal view of idiosoma, 21. Eustigmaeus piracicabensis Paktinat-Saeij & Bagheri sp. nov. (Female): Ventral view of idiosoma (horseshoe shield), 22. Eustigmaeus piracicabensis Paktinat-Saeij & Bagheri sp. nov. (Female): Dorsal setae.