Stigmaeus lorestaniensis, Ahmad-Hosseini & Jafari, 2022

Ahmad-Hosseini, Mohammad & Jafari, Shahriar, 2022, Stigmaeus lorestaniensis, a new species of the genus Stigmaeus (Acari: Stigmaeidae) from Southwest of Iran, Persian Journal of Acarology 11 (2), pp. 237-243 : 238-241

Stigmaeus lorestaniensis sp. nov. ( Figs. 1–9 )

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Diagnosis

Eyes and post-ocular bodies absent; dorsal shields smooth; median zonal shield divided; suranal shield divided with two pairs of setae (h3 absent); aggenital shield divided into two sclerites each bearing four setae and genital shield with two pairs of setae; palp genu with one seta; femora I-IV 4- 4-3-2; genua I-IV 5+1κ-2-0-0; tarsi II with 8+1 ω.

Description (female, n= 2)

Idiosoma oval. Length of body (excluding gnathosoma) 315 (307); width 157 (161) at level of seta c2; length of gnathosoma 105 (108); width of subcapitulum 82 (87); palp 98 (95); chelicera 85 (82).

Dorsum ( Fig. 1 ) – All dorsal shields smooth, anteromarginal area of prodorsum punctuated, prodorsal shield with three pairs of setae (vi, ve, sci); eyes and post-ocular bodies absent; setae sce on minute individual platelets, located laterally. Median hysterosomal shield without setae, setae c1 and d1 on small plates lateral to central shield. Setae c2 on small shields placed dorsolaterally; marginal shields almost small and bearing setae d2; median zonal shield divided and with seta e1; setae e2 on small lateral zonal shields; intercalary shields with setae f1; suranal shield divided, bearing two pairs of setae (h1 and h2), h3 absent, setae ve and c2 are subequal in length and longer than other setae. Lengths of dorsal setae: vi 13 (14), ve 42 (45), sci 18 (17), sce 23 (25), c1 13 (14), c 2 41 (39), d1 14 (15), d2 15 (14), e1 13 (14), e2 13 (13), f1 18 (19), h1 19 (17), h2 29 (30). Distances between dorsal setae: vi–vi 30 (27), vi–ve 15 (17), ve–ve 32 (34), ve–sci 39 (37), sci–sci 56 (58), sci–sce 32 (30), sce– sce 104 (110), c1–c1 49 (45), c1–d1 59 (57), d1–d1 40 (37), d1–d2 41 (37), d2–d2 108 (103), d1– e1 45 (40), d2–e2 63 (60), e1– e1 36 (33), e1– e2 33 (35), e2–e2 107 (104), e1–f1 27 (26), f1–f1 47 (43), f1–h1 31 (29), f1–h2 30 (32), h1–h1 30 (25), h1–h2 12 (10), h2–h2 58 (47). Ratio: vi/vi–vi 0.43 (0.51), c1 / c1–c1 0.26 (0.31), d1 / d1–d1 0.35 (0.40), e1 / e1– e1 0.36 (0.42), f1 / f1–f1 0.38 (0.44), ve / sci 2.33 (2.64), h1 / h2 0.65 (0.56), ve / vi 3.23 (3.21).

Venter ( Fig. 2 ) – All ventral setae and plates smooth, striation longitudinal between coxisternal regions I-II and III-IV, and transversal between coxae II and III. Aggential shield divided into two sclerites each bearing four setae (ag1-4) and genital shield with two pairs of setae (g1 and g2); anal plate with three pairs of setae (ps1-3). Lengths of ventral setae: 1a 17 (16), 1b 16 (16), 1c 28 (30), 2b 36 (34), 2c 25 (24), 3a 22 (20), 3b 16 (17), 3c 15 (15), 4a 19 (17), 4b 14 (15), 4c 12 (11), ag1 14 (14), ag2 13 (12), ag3 12 (13), ag4 23 (21), g1 13 (12), g2 17 (19), ps1 20 (19), ps2 20 (18), ps3 21 (20).

Gnathosoma ( Figs. 3–5 ) – Subcapitulum with two pairs of subcapitular setae, m 20 (18) and n 46 (42), two pairs of adoral setae, or1 7 (6), or2 8 (9) ( Fig. 3 ). Chelicerae free 60 (58), movable digit 27 (28) ( Fig. 4 ). Palp 96 (92), palp tarsus with four simple setae + one simple eupathidium + one solenidion [ω 4 (4)] + one tridentate eupathidium, palp tibia with two setae + one well developed claw + one seta-like accessory claw, palp genu with one seta and palp femur with three setae. Palpal supracoxal setae (ep) small, with distinctly rounded tip 3 (3). Tibial claw of palp 12 (11) longer than palp tarsus 9 (9) ( Fig. 5 ).

Legs ( Figs. 6–9 ) – Legs measurements from coxae to tarsus (including pretarsus): leg I 180 (185); leg II 135 (132); leg III 140 (137), leg IV 163 (166). Setal formulae of leg segments (solenidia in parentheses and not included in setal counts) as follows: coxae 2-2-2-2; trochanters 1-1-2-1; femora 4-4-3-2; genua 5(+κ)-2-0-0; tibiae 5 (+φ+φp)-5(+φp)-5(+φp)-5(+φp); tarsi 13(+ω)-8(+ω)-7 (+ω)-7 (+ω) ( Figs. 6–9 ). Length of solenidia: Iω 12 (11), IIω 8 (7), IIIω 5 (4), IVω 4 (5). Iφρ 13 (14), Iφ 11 (10), IIφρ 8 (9), IIIφρ 8 (7), IVφρ 7 (7), I κ 5 (5).

Male – Unknown.

Etymology

The specific epithet is derived from type locality, " Lorestan " province, Iran where it was collected .

Type material

Holotype female and one paratype female were collected from soil under apricot tree, Prunus armeniaca L. ( Rosaceae ), 5 August 2021, Shorab village, (33° 27′ N, 48° 41′ E), Lorestan Province, Iran, by Mohammad Ahmad-Hosseini. The holotype female is deposited in the Acarological collection, Department of Plant Protection, Faculty of Agriculture, Lorestan University, Khorramabad, Iran. One female paratype is deposited in the Acarological collection, Jalal Afshar Zoological Museum (JAZM), Department of Plant Protection, Faculty of Agriculture, University of Tehran, Karaj, Iran.

Remarks

The new species Stigmaeus lorestaniensis sp. nov. resembles S. devlethanensis Akyol & Koç, 2007 ; S. karabagiensis Akyol & Koç, 2007 and S. pseudoparmatus Doğan, Doğan & Erman, 2017 by the following characters: dorsomedial setae c1 and d1 originate on small detached shields from central shield, eyes and post-ocular bodies absent, aggential area with four pairs of setae, palp genu with one seta and in the setal formula of femora (4-4-3-2). But, it can be distinguished from them by; setal formula of genua 5(+ k)-2-0-0 in the new species (5(+ k)-2-0-l in S. karabagiensis , 5(+ k)-5-2- 2 in S. devlethanensis and 5(+ k)-2-0-l in S. pseudoparmatus ); suranal shield divided and with two pairs of setae (entire, with three pairs of setae in S. devlethanensis and divided with three pairs of setae in S. karabagiensis and also in S. pseudoparmatus ); tarsi II with 8(+ω) setae (with 9(+ω) in other related species); aggenital plates with four pairs of setae (aggenital plates split into two pairs small shields, ag1 and ag2 on the same shields and ag3 and ag4 on other shields in S. devlethanensis and ag1 located on integument, others on aggenital shields in S. pseudoparmatus ); prodorsal shield with three pairs of setae (prodorsal shield reduced, with two pairs of setae in S. karabagiensis and S. pseudoparmatus ).

Figures

Figures 1–2. Stigmaeus lorestaniensis sp. nov. (female) – 1. Dorsal view of idiosoma; 2. Ventral view of idiosoma.

Figures 3–9. Stigmaeus lorestaniensis sp. nov. (female) – 3. Dorsal view of left palp; 4. Dorsal view of chelicerae, 5. Subcapitulum; 6. Leg I; 7. Leg II; 8. Leg III; 9. Leg IV.