Atractides (Atractides) bakhtiari Pešić, Asadi & Saboori, 2016

Pešić, Vladimir, Smit, Harry & Saboori, Alireza, 2021, New records of the water mite genus Atractides Koch, 1837 from Iran (Acari: Hydrachnidia: Hygrobatidae), Ecologica Montenegrina 44, pp. 1-10 : 4-6

Atractides (Atractides) bakhtiari Pešić, Asadi & Saboori, 2016

Figs. 2-3

Material examined — Iran, IR75 North Khorasan Province, Darrood stream in Darrood city (ca. 59º08´E, 36º10´N), ca. 2200 m asl., 10.06.2005. leg. Pešić & Saboori, 2 ♂, 4 ♀ (1 ♂, 1 ♀, dissected and slide mounted - RMNH) .

Description. Female — Integument lineated, muscle insertions unsclerotized. Glandularia diameter 23 µm. Mediocaudal margin Cx-I indented, apodemes of Cx-II strong, in an acute angle with the median line ( Fig. 3A ). Acetabula in a weakly curved line ( Fig. 3C ). Excretory pore smooth; Vgl-1 not fused to Vgl-2. Palp: P- 2 with a slightly convex ventrodistal margin; P-3 ventral margin concave; P-4 slender than in male, ventral margin slightly protruding near proximoventral seta, sword seta between ventral setae ( Fig. 3B ). I-L-5: S-1-2 separated, with obtuse tips, S-1 slender, S-2 shorter and proximally enlarged; I-L-6 maximum H in basal part, distally equally narrowed ( Fig. 3D ).

Measurements. Male — Idiosoma L 525 W 413; maximum diameter Dgl-3, 23. Coxal shield L 322; Cx-III W 353; Cx-I+II mL 91, Cx-I+II lL 197. Genital field L/W 98/102 ratio 0.97, L Ac-1-3: 31-34, 34-36, 24-25. Ejaculatory complex L 125.

Gnathosoma — palp total L 275; dL/H, dL/H ratio: P-1, 31/25, 1.25; P-2, 64/53, 1.21; P-3, 59/42, 1.41; P-4, 88/38, 2.3; P-5, 33/14, 2.3; length ratio P-2/P-4 0.73. Chelicera total L 192.

Legs — I-L-5 dL 170, vL 109, dL/vL ratio 1.56, maximum H 47, dL/maximum H 3.6, S-1 L 83, L/W ratio 8.3, S-2 L 66, L/W ratio 5.3, distance S-1-2, 22, dL ratio S-1/2 1.26; I-L-6 dL 134, central H 23, dL/central H ratio 5.9; L I-L-5/6 ratio 1.27.

Female — Idiosoma L 734, W 550; maximum diameter Dgl-3, 23. Coxal shield L 381; Cx-III W 453; Cx-I+II mL 98, Cx-I+II lL 234. Genital field L/W 154/166, genital plates L 120, pregenital sclerite W 75, gonopore L 136, L Ac-1-3: 41-44, 35-38, 31.

Gnathosoma — palp total L 362; dL/H, dL/H ratio: P-1, 38/33, 1.14; P-2, 81/56, 1.46; P-3, 91/44, 2.1; P-4, 113/30, 3.8; P-5, 39/14, 2.8; length ratio P-2/P-4 0.72. Chelicera total L 238.

Legs — I-L-5 dL 238, vL 147, dL/vL ratio 1.6, maximum H 60, dL/maximum H 3.95, S-1 L 105, L/W ratio 9.6, S-2 L 78, L/W ratio 4.9, distance S-1-2, 31, dL ratio S-1/2 1.34; I-L-6 dL 163, central H 21, dL/central H ratio 7.7; L I-L-5/6 ratio 1.45.

Remarks — The species was described by Pešić et al. (2016) on the basis of a single male collected in a small stream in Chahar Mahal and Bakhtiari Province. The latter specimen was originally assigned by Pešić et al. (2004a) to A. fluviatilis , a species which in both sexes differs in the shape of the genital field and arrangement of Ac ( A. fluviatilis : Ac nearly equal or Ac-3 larger, male genital plate anterior margin straight or slightly concave). This is the first description of the female.

The new record of A. bakhtiari from the northern Khorasan province is about 1000 kilometers away from the locus typicus of the latter species ( Fig. 4), and therefore additional studies relying on molecular analysis are recommended.

Distribution — Iran ( Pešić et al. 2016; this study).

Figures

Figure 2. Atractides bakhtairi Pešić, Asadi & Saboori, 2016, ♂, Darrood, Iran. A – genital field; B – palp, medial view; C – I-L-5 and -6. Scale bar = 100 µm.

Figure 3. Atractides bakhtiari Pešić, Asadi & Saboori, 2016, ♀, Darrood, Iran. A – coxal field, partial view; B – palp, medial view; C – genital field; D – I-L-5 and -6. Scale bars = 100 µm.