Neotetranychus longisetus, Khan & Kamran & Alatawi, 2019

Khan, Eid Muhammad, Kamran, Muhammad & Alatawi, Fahad Jaber, 2019, A new species and new records of Tetranychidae (Acari: Trombidiformes) from Saudi Arabia, with a key to world species of Mixonychus Ryke and Meyer, Acarologia 59 (4), pp. 492-506 : 494-498

Neotetranychus longisetus n. sp.

( Figures 1−4 )

Zoobank: 553E8F35-7EF4-46F7-B567-DB5CF26F0093

Diagnosis (Based on adult female) — Propodosoma medially with longitudinal striae; hysterosoma medially with transverse striae and laterally with longitudinal to oblique striae; striae encircling bases of each dorsal seta, forming concentric rings; cuticle with rows of regular, shallow, scallop-shaped projections; dorsal body setae acicular, of even thickness along length, finely serrated, inserted on distinct tubercle; most of the dorsal setae twice as long as the distance to base of setae next consecutive row, dorsocentral setal pairs c1, d1, e1 and f1 subequal distance apart.

Description of the Adult female (n = 12)

Length of idiosoma (excluding gnathosoma) 331 (315−345), (including gnathosoma) 404 (390−420), maximum width at the level of row c setae 263 (255−270).

Dorsum ( Figures 1 A-C) — Dorsal integument entirely striated, striae longitudinal on propodosoma, striae transverse medially and longitudinal to oblique laterally on hysterosoma; cuticle with rows of regular, shallow, scallop-shaped projections ( Figures 1 A-B); dorsum with 13 pairs of setae; seta c3 inserted at lateral margin of body, often situated ventrally; setae v2, sc2, c3 and h1 shorter than other dorsal setae, almost equal in length; dorsocentral setal pairs c1, d1, e1 and f1 subequal distance apart. Length of dorsal setae: v2 63 (60−65), sc1 110 (107−114),

sc2 63 (60−65), c1 142 (135−148), c2 126 (120−130), c3 65 (62−68), d1 142 (138−150), d2

129 (120−135), e1 89 (84−93), e2 123 (120−128), f1 105 (100−120), f2 84 (80−90), h1 63 (60−68); distance between dorsal setae: v2−v2 53 (50−55), sc1−sc1 68 (65−70), sc2−sc2

205 (200−210), c1−c1 42 (39−43), c2−c2 126 (120−135), c3−c3 263 (250−280), d1−d1 42 (39−45), d2−d2 147 (140−155), e1− e1 37 (35−42), e2−e2 131 (127−140), f1−f1 37 (35−40), f2−f2 108 (104−115), h1−h1 27 (25−30), v2−sc1 23 (21−25), sc1−sc2 63 (60−65), sc2−c3 74 (70−80), sc2−c2 53 (50−58), sc2−c1 84 (81−90), c1−c2 42 (38−45), c2−c3 71 (68−74), c1−d1 54 (50−58), c2−d2 58 (56−61), d1−e1 68 (66−72), d2−e2 68 (65−74), e1−f1 58 (53−60), e2−f2 74 (72−78), f1−h1 42 (39−45), f2−h1 55 (52−58), h2 21 (19−22), h3 26 (24−28), h2−h2

25 (23−26), h3−h3 45 (40−45).

Venter ( Figures 2 A-B) — Ventral idiosoma with transverse striations from setae 1a to just anterior to ag, pregenital area with transverse to arching striation ( Figure 2B ); striations on venter without lobes. Length of ventral setae: 1a 53 (51−55), 3a 55 (52−58), 4a 53 (50−55),

1b 63 (60−65), 1c 53 (51−56), 2b 58 (55−60), 2c 42 (39−44), 3b 50 (50−52), 4b 53 (50−55); distance between inter-coxal and coxae setae: 1a−1a 26 (25−28), 1b−1c 11 (10−12), 3a−3a 53 (50−55), 4a−4a 63 (60−65); aggenital setae: ag 55 (53−57), ag−ag 62 (60−65); two pairs of genital setae: g1 27 (25−29), g2 32 (31−34), g1−g1 26 (23−28), g2−g2 70 (65−74); two pairs

of pseudoanal setae: ps1 16 (15−18), ps2 15 (13−16), ps1−ps2 6 (5−7), ps1−ps1 32 (30−35), ps2−ps2 21 (20−23).

Gnathosoma ( Figure 3 ) — Ventral infracapitular setae m 50 (48−53), m −m 35 (33−37).

Palp femur and genu each with one seta, d 28 (26−29), l” 18 (16−19); palp tibia with three setae, d 22 (19−22), l” 16 (15−18), l’ 15 (15−16) and a palp tibial claw; palp tarsus 14 long, 11 wide, with three simple setae a 10 (9−11), b 7 (7−9), c 8 (7−10), three eupathidia suζ 7 (6), ul”ζ = ul’ζ 6 (5−7), a solenidion ω 5 long; stylophore with weak anterior notch; peritremes terminating in short hook, like a golf-club ( Figure 1C ); terminal sensillum of palp tarsus conical, long, pointed about three times as long as wide ( Figure 3 ).

Legs ( Figures 4 A-E) — Length of legs I−IV (without coxae): 184 (175−190), 173 (165−180), 191 (184−199), 200 (190−210) respectively; leg I 184 (175−190): trochanter 16

(14−17), femur 58 (55−61), genu 37 (35−38), tibia 37 (35−40), tarsus 37 (35−42); leg II 173 (165−180): trochanter 16 (15−17), femur 53 (51−58), genu 37 (34−39), tibia 42 (39−45),

tarsus 42 (38−44); leg III 191 (184−199): trochanter 24 (23−26), femur 47 (45−49), genu 34

(31−36), tibia 42 (40−45), tarsus 42 (40−45); leg IV 200 (190−210): trochanter 21 (20−22),

femur 47 (43−50), genu 37 (35−39), tibia 42 (40−45), tarsi 53 (50−55). Chaetotaxy on legs

I−IV (solenidia in parentheses): coxae 2−1−1−1, trochanter 1−1−1−1; femora 9−7−4−4; genua 5−5−3−3; tibiae 9(1ω)−7(1ω)−6−6; tarsi 11(3ζ, 2ω)−9 (3ζ, 2ω)−8(1ω)−8(1ω).

Male and immature stages Unknown.

Etymology — The specific epithet refers to the length of dorsocentral setae which are comparatively longer than that of other species.

Material examined — Holotype female and 11 paratypes females, Heliotropium arbainense (Boraginaceae) , Taif, 21°21.151ʹN, 040°19.515’E, elevation 1843 m, 11 September 2017, coll. E. M. Khan and M. U. Rehman. One Holotype female ( KSMA-ARL -19/5) and 11 paratypes female (KSMA-ARL-19/6-16) has been deposited at King Saud University Museum of Arthropods ( KSMA, Acarology section), Department of Plant Protection, College of Food and Agriculture Sciences, King Saud University, Riyadh, Saudi Arabia.

Remarks — Neotetranychus longisetus n. sp., is different from all other species of Neotetranychus by entire dorsum striated and with scallop-shaped structures. However, the new species resembles N. lek Flechtmann 2013 . Neotetranychus lek has longitudinal striae between opisthosomal setae e1−e1 vs. transverse striae on N. longisetus n. sp., femur and genu III each 4 setae vs. 4 and 3 on N. longisetus and femur and genu IV each with 3 setae vs. 4 and

3 setae on N. longisetus n. sp..

New records for Saudi Arabia

Figures

Figure 1 Neotetranychus longisetus n. sp., adult female: A, B – Dorsum; C – Peritremes. Scalebar A, B = 100μζ.

Figure 2 Neotetranychus longisetus. n. sp., adult female: A – Venter; B – Genital area. Scalebar A, B = 100μζ.

Figure 3 Neotetranychus longisetus. n. sp., adult female: Palp. Scalebar = 50μζ.

Figure 4 Neotetranychus longisetus n. sp., adult female: A – Leg I; B – Leg II; C – Leg III; D – Leg IV; E – Leg I Empodium. Scalebar A-D = 100 μζ, E = 10 μζ.