Stigmaeus diversus Barilo, 1987

Doustaresharaf, Mojtaba Mohammad & Bagheri, Mohammad, 2019, First report of the Stigmaeus diversus (Acari: Stigmaeidae) from Iran, Persian Journal of Acarology 8 (3), pp. 277-279 : 277-278

Stigmaeus diversus Barilo, 1987 ( Fig. 1)

Redescription of female

Dorsum ( Fig. 1) – Dorsum with 13 pairs of setae (setae h3 absent); all dorsal shields completely reticulated, 310 long, 203 wide; prodorsal shield with 3 pairs of setae (vi, ve and sci); setae sce on small shields; eyes present but post-ocular bodies (pob) absent; median hysterosomal shield with two pairs of setae (c1, d1); setae d2 located on lateral shields; seta e2 on lateral zonal shield; intercalary shields separated and bearing setae f1; suranal shield undivided and with two pairs of setae (h1 and h2); dorsal setae with small spinules. Length of dorsal setae: vi 44, ve 63, sci 28, sce 51, c1 45, c2 47, d1 49, d2 48, e1 50, e2 55, f1 62, h1 60, h2 64.

Venter – Endopodal shields punctuated, well divided by striae and with three pairs of ventral setae (1a, 3a and 4a); three pairs of aggenital setae (ag1–ag3); one pair of genital setae (g1) and three pairs of pseudanal setae (ps1–ps3); length of ventral setae: 1a = 3a = 4a 18, ag1 15, ag2 16, ag3 17, g1 12, ps1 36, ps2 32, ps3 18.

Gnathosoma – Hypostome reticulated, with two pairs of subcapitular setae (m, n), m 20, n 14 and two pairs of adoral setae (or1, or2). Palps 72 long, five segmented: palptarsus with one terminal tridentae eupathidium, one solenidion and five simple setae; palptibia with one developed claw and two setae, accessory claw spine-like; palp genu with two setae and palp femur with three setae.

Legs – Length of legs I–IV: 192, 167, 165 and 205 respectively, including pretarsus. Segments punctuated, setal formulae of segments (solenidia in parentheses and not included) as follows: coxae 2-2-2-2, trochanters 1-1-2-1, femora 6-5-3-2, genua 2(+ κ)-2(+ κ)-0-0, tibiae 5(+ φ,φρ)-5(+ φ)- 5(+ φ)-5(+ φ), tarsi 13(+ ω)-9(+ ω)-7(+ ω)-7(+ ω).

Habitat

Soil under Medicago sp. [ Fabaceae ] and Salix sp. [ Salicaceae ] ( Barilo 1987; Fan et al. 2016); soil under Carpinus sp. [ Betulaceae ] (present study).

Distribution Uzbekistan ( Barilo 1987; Fan et al. 2016), Iran (present study).

Material examined

One female specimen was collected from soil under Carpinus sp. by M. Mohammad Doustaresharaf in 27 August 2018, from Arasbaran Forests , North East Azerbaijan Province, Iran, (38° 56' 42" N, 46° 45' 43" E) , and deposited in the Acarological Collection, Department of Plant Protection , Faculty of Agriculture, University of Maragheh, Maragheh, Iran .

Discussion

Barilo (1987) described this species from Uzbekistan, in Russian language. We now have found it in Iran, extending its distribution area. Most features of the Iranian specimen including pattern of dorsal shields, shape of dorsal setae and leg stations are very close to those in the original description, but there are negligible differences in length of dorsal seta.