Cheylostigmaeus hassanpouri, Bagheri & Navaei-Bonab & Ueckermann & Ghorbani, 2011

Bagheri, M., Navaei-Bonab, R., Ueckermann, E. A. & Ghorbani, H., 2011, Cheylostigmaeus Hassanpouri N. Sp., A New Species Of The Genus Cheylostigmaeus Willmann, 1951 (Acari: Trombidiformes: Stigmaeidae) From Northwest Iran, Acarologia 51 (3), pp. 347-357 : 350-356

Cheylostigmaeus Willmann, 1951

Cheylostigmaeus hassanpouri n. sp. Bagheri ( Figures 1–11 )

Diagnosis — Dorsal setae are thick and barbed sparsely in male and female; palpfemur without apophyses; ratios of setae sce: sci = 1.9, ve: sci = 2.6 in female; endopodal shield divided and smooth in both sex; femura I-IV and genua II-IV of male and female each with one sheathed seta; subcapitulum of male with one pair of bicuspidate lamellae; aedeagus without bulb, reversed comma-shape sclerotized appendages present on both sides of shaft distally.

Holotype male (n = 4) — Idiosoma oval, idiosoma length 292 (285 – 300); idiosoma width 214 (210 – 217); length of leg I 330 (325 – 331); leg II 280 (275 – 285); leg III 230 (265 – 270); leg IV 271 (267 – 274).

Dorsum — ( Figure 1 ): Dorsum covered with three weakly sclerotized and smooth shields; no obvious dimples or micro-punctations observed; prodorsal shield truncated anteriorly, triangular and bearing four pairs of setae (vi, ve, sci and sce) and a pair of eyes; setae ve are the longest and setae sci the shortest; opisthosomal shield with six pairs of setae (c1, d1, d2, e1, e2 and f1) and suranal shield with two pairs of setae (h1 and h2); h2 twotimes longer than h1; most of dorsal setae fairly rigid, sparsely barbed and hyaline sheaths cover their tips; humeral shield bearing setae c2 situated ventro-laterally. Length of setae: vi 28 (26 – 30); ve 67 (65 – 73); sci 19 (18 – 21); sce 49 (46 – 51); c1 34 (33 – 35); c2 52 (50 – 55); d1 34 (34 – 35); d2 40 (39 – 41); e1 33 (32 – 35); e2 42 (40 – 45); f1 65 (62 – 68); h1 23 (22 – 25); h2 41 (40 – 45); distances between dorsal setae: vi -vi 32 (30 – 35); ve -ve 72 (70 – 75); vi -ve 41 (39 – 43); ve -sci 22 (20 – 24); sci -sci 108 (106 – 110); sci -sce 22 (20 – 24); sce -sce 126 (125 – 130); c1-d1 55 (53 – 57); c1-d2 53 (50 – 55); d1-d1 93 (93 – 95); d1-d2 39 (37 – 42); d1- e1 50 (47 – 52); d1- e2 31 (30 – 33); d2- e2 52 (50 – 54); e1-e1 69 (67 – 71); e1- e2 35 (33 – 38); e1-f1 25 (23 – 27); f1-f1 63 (60 – 65); h1-h1 31 (30 – 33); h1-h2 11 (10 – 12); h2-h2 60 (57 – 63).

Venter — ( Figure 2 ): Coxae I-II and III-IV surrounded by smooth and divided endopodal shields; length of setae 1a 23 (21 – 25), 3a 22 (20 – 25), and 4a 20 (20 – 22); anogenital shield with three pairs of subequal aggenital setae (ag1-ag3) and three pairs of pseudanal (ps1-ps3) setae on tubercles; measurements of setae: ag1 16 (15 – 17); ag2 16 (15 – 18); ag3 20 (19 – 22); ps1 11 (11 – 12); ps2 12 (12 – 13); ps3 15 (14 – 15).

Gnathosoma — Chelicerae finely punctated, fixed digit 80 and moveable digit 60; palpi ( Figure 5 ) five-segmented; palptarsus with five tactile setae plus one solenidiom (ω) and one trifid eupathidium distally; palptibia with two setae plus one claw and one spine-like accessory claw; palpgenu with two dorsal and palpfemur with three setae; palptrochanter without setae. Subcapitulum ( Figure 3 ) finely punctated and with two pairs of subcapitular setae (m and n), m 19 (18 – 21), n 20 (18 – 24) and two pairs of adoral setae (or1 and or2), or1 17 (17 – 19), or2 19 (17 – 20); subcapitulum bears a pair of strongly developed wing-like lamellae and one pair of acute teeth in front of lamellae, each lamellae thick and bicuspidate in front.

Aedeagus — ( Figure 4 ) Calyx of the aedeagus funnel-shaped, shaft straight and pointed distally, no obvious bulb; reversed comma-shaped sclerotized appendages present on both sides of shaft distally.

Legs — ( Figures 6 ): Counts of setae (excluding solenidia; solenidia in parentheses) on legs I- IV: coxae 2-2-2-2; trochanter 1-1-2-1; femora 6-5- 3-2; genua 4-3+Κ-1-1; tibiae 5(+1’+1’p)-5(+1’p)- 5(+1’p)-5(+1’p); tarsi 13(+2ω)-9(+2ω)-7(+2ω)- 7(+2ω); dorsal setae are rigid and sparsely barbed; femora I-IV and genua II-IV each with one distinct sheathed seta; lengths of solenidia: I ω1 29 (28 – 30), I ω2 42 (40 – 44); II ω1 20 (20 – 21); II ω2 50 (48 – 52); III ω1 9 (8 – 10); III ω2 41 (40 – 44); IV ω1 6 (5 – 8); IV ω2 37 (35 – 40); I φ 11 (10 – 12); φp 21 (20 – 22); II φ 19 (19 – 21); III φ 21 (20 – 23); IV φ 19 (18 – 20).

Female (n = 5) — Idiosoma oval, idiosoma length: 350 (340 – 365); idiosoma width 280 (270 – 292); length of leg I 360 (350 – 370); leg II 300 (294 – 305); leg III 265 (260 – 270); leg IV 320 (312 – 325).

Dorsum — ( Figure 7 ): Dorsum covered with two shields, the shields weakly sclerotized; no obvious dimples or micro-punctations; suranal shield is displaced to ventral position; prodorsal shield with four pairs (vi, ve, sci and sce) of setae and a pair of eyes, setae ve are the longest and setae sci the shortest; opisthosomal shield with six pairs of setae (c1, d1, d2, e1, e2 and f1); suranal shield with two pairs of setae (h1 and h2); dorsal setae fairly rigid, sparsely barbed and hyaline sheaths cover their tips; humeral shields bearing setae c2 situated ventro-laterally. Length of setae: vi 50 (48 – 50); ve 90 (85 – 90); sci 35 (33 – 36); sce 65 (62 – 67); c1 50 (50 – 51); c2 70 (70 – 75); d1 50 (49 – 50); d2 60 (54 – 60); e1 55 (55 – 60); e2 60 (57 – 63); f1 80 (72 – 81); h1 55 (50 – 55); h2 50 (48 – 50); distances between dorsal setae: vi – vi 40 (37 – 41); ve -ve 95 (92 – 98); vi -ve 65 (64-66); ve -sci 35 (33 – 35); sci -sci 150 (145 – 152); sci -sce 30 (27 – 32); sce -sce 180 (176 – 182); c1-c1 120 (118 – 125); c1-d1 76 (75 – 77); c1-d2 60 (59 – 63); d1-d1 115 (111 – 116); d1-d2 65 (62 – 67); d1-e1 80 (79 – 82); d1- e2 55 (53 – 55); d2-e2 80 (77 – 81); e1-e1 95 (92 – 96); e1- e2 55 (55 – 57); e1-f1 60 (60 – 63); f1-f1 75 (74 – 77); h1-h1 30 (30 – 34); h1-h2 20 (19 – 22); h2-h2 50 (49 – 53); setal ratios: vi: vi -vi 1.25; c1: c1-c1 0.42; d1: d1-d1 0.43; e1: e1- e1 0.58; f1: f1-f1 1.06; h1: h1-h1 1.83; h2: h2-h2 1; c1-c1: d1-d1: e1-e1: f1-f1 1.60: 1.53: 1.27: 1.00.

Venter — ( Figure 8 ): Ventral cuticle striated; coxae I-II and III-IV surrounded by smooth and divided endopodal shields; length of setae 1a 30 (28 – 30), 3a 30 (28 – 31), and 4a 32 (30 – 32); anogenital shield with three pairs of subequal aggenital setae (ag1-ag3) and three pairs of pseudanal (ps1-ps3) setae; measurements of setae: ag1 15 (15 – 21); ag2 20 (18 – 21); ag3 20 (19 – 22); ps1 20 (19 – 20); ps2 20 (19 – 21); ps3 22 (19 – 22).

Gnathosoma — Chelicerae finely punctated, fixed digit 80 and moveable digit 60; palpi ( Figure 9 ) five-segmented; palptarsus with five tactile setae plus one solenidiom (ω) and one trifid eupathidium distally; palptibia with two setae plus one claw and one spine-like accessory claw; palpgenu with two setae and palpfemur with three setae; palptrochanter without setae. Subcapitulum ( Figure 10 ) finely punctated and with two pairs of subcapitular setae (m and n), m 35 (33 – 36), n 25 (25 – 27) and two pairs of adoral setae (or1 and or2), or1 17 (15 – 17), or2 30 (27 – 31).

Legs — ( Figures 11 ): Counts of setae (excluding solenidia; solenidia in parentheses) on legs I- IV: coxae 2-2-2-2; trochanters 1-1-2-1; femora 6-5- 3-2; genua 4-3+Κ-1-1; tibiae 5(+1’+1’p)-5(+1’p)- 5(+1’p)-5(+1’p); tarsi 13(+1ω)-9(+1ω)-7(+1ω)- 7(+1ω); dorsal setae are rigid and sparsely barbed;

femora I-IV and genua II-IV each with one distinct sheathed seta; lengths of solenidia: I ω 27 (25 – 27), II ω 19 (18 – 20); III ω 10 (10 – 11); IV ω 4 (4 – 5); I φ 12 (12 – 13); I φp 25 (23 – 25); II φp 20 (18 – 20); III φp 17 (16 – 17); IV φp 20(18 – 21).

Etymology — This species is named in honor of Dr. Mehdi Hassanpour, University of Mohaghegh Ardabili who is the friend of the first author.

Material examined — Holotype male, allotype female, paratype males (3) and paratype females (n= 4) were collected from soil in apple orchards, 20 August 2009, Marand , East Azerbaijan province, Iran, by Reza Navaei-Bonab. The holotype and one paratype female are deposited in the Arachnida Collection of Plant Protection Research Institute , Pretoria , South Africa and the rest of the paratypes are deposited in the Acarological Collection , Department of Plant Protection , Faculty of Agriculture , University of Maragheh, Maragheh, Iran.

Remarks — The new species is unique in having the following characters:

1. setae sci are the smallest dorsal setae and 1/3 length of ve, the longest setae,

2. shape of the male aedeagus.

The new species closely resembles Cheylostigmaeus luxtoni Wood ( Wood, 1968) by having one pair of bicuspidate lamellae on subcapitulum and absence of bulb on aedeagus but differs from the latter by:

1. the length of setae sci 18 – 21 in new species vs 34 – 49 in C. luxtoni,

2. the distance vi -vi in the new species (30 – 35) is about the half (59 – 69) than in C. luxtoni,

3. shape of copulatory appendages of aedeagus in the two species distinctively differ.

Cheylostigmaeus hassanpouri n. sp. is also close to C. pannonicus Willmann ( Summers and Ehara, 1965) by the following characters: femur of palpus without apophyse and having one pair of bicuspidate lamellae on subcapitulum. But it differs from this latter species by:

Bagheri M. et al.

1. aedeagus of C. pannonicus has a capacious bulb which is absent in the new species, additionnaly the copulatory appendages have different shapes in the two species,

2. ratio ve: sci = 2.6 in female of the new species vs 1.3 in those of C. pannonicus.

The new species also resembles to Cheylostigmaeus urhani Dönel, G. and Dogan as in both species the setae sci are the smallest prodorsal setae and there is a bicuspidate lamellae on subcapitullum.

However these species could be differentiated by the following characters:

1. in all specimens of the new species apophyses on the palp femur are absent whereas C. urhani has apophyses on the palp femur,

2. ratio of sce: sci = 1.9 [sce 65 (62 – 67), sci 35 (33 – 36)] in female of the new species vs 1.4 [sce 110 (105 – 125), sci 77 (65 – 97)] in C. urhani,

3. there is not obvious bulb on aedeagus of the new species vs capacious bulb in C. urhani,

4. endopodal shield of the new species is smooth vs reticulated in C. urhani.

Figures

FIGURE 1: Cheylostigmaeus hassanpouri n. sp. (Male) – Dorsal view of body.

FIGURE 2: Cheylostigmaeus hassanpouri n. sp. (Male) – Ventral view of body.

FIGURE 3: Cheylostigmaeus hassanpouri n. sp. (Male) – Subcapitulum.

FIGURE 4: Cheylostigmaeus hassanpouri n. sp. (Male) – Aedeagus.

FIGURE 5: Cheylostigmaeus hassanpouri n. sp. (Male) – Palp.

FIGURE 6: Cheylostigmaeus hassanpouri n. sp. (Male): A – Leg I, femur-tarsus; B – Leg II, femur-tarsus; C – Leg III, femur-tarsus; D – Leg IV, femur-tarsus

FIGURE 7: Cheylostigmaeus hassanpouri n. sp. (Female) – Dorsal view of body.

FIGURE 8: Cheylostigmaeus hassanpouri n. sp. (Female) – Ventral view of body.

FIGURE 9: Cheylostigmaeus hassanpouri n. sp. (Female) – Palp.

FIGURE 10: Cheylostigmaeus hassanpouri n. sp. (Female) – Subcapitulum.

FIGURE 11: Cheylostigmaeus hassanpouri n. sp. (Female): A – Leg I, femur-tarsus; B – Leg II, femur-tarsus; C – Leg III, femur-tarsus; D – Leg IV, femur-tarsus.