Atractides (Atractides) karakali, Pešić & Smit, 2021

Pešić, Vladimir & Smit, Harry, 2021, Water mites of the genus Atractides Koch, 1837 from Kyrgyzstan (Acari: Hydrachnidia: Hygrobatidae) with the description of six new species, Acarologia 61 (2), pp. 332-355 : 337-340

Atractides (Atractides) karakali n. sp.

Zoobank: 4E8E8D02-DAE8-4A1D-B134-538E3E1DA007

Figures 4-5

Type material — Kyrgyzstan: Holotype ♂, dissected and slide mounted ( RMNH), KR8 Chon-Kemin NP, upper part of stream near Ashu resort, Kalman Ashu village, 42°42.276 ′ N, 76°05.101 ′ E, 1644 m a.s.l., 10 Aug. 2013, leg. Pešić & Smit. Paratypes: 2♀, same site and data as the holotype, leg. Pešić & Smit, 1♀, dissected and slide mounted ( RMNH).

Diagnosis — Integument striated; glandularia enlarged (Dgl-4 50-60 µm); Vgl-3 not fused with Cx-IV; acetabula small (maximum diameter <40 in ♂, <50 µm in ♀) arranged in an obtuse triangle; excretory pore smooth; palp with weak sexual dimorphism, P-2 without a ventrodistal projection, P-4 sword seta near level of distoventral seta; I-L-5 ratio dL/H 3.5; S-1-2 separation short, ˂ 15 in ♂, ˂ 20 µm in ♀.

Description — General features — Integument striated, muscle insertions unsclerotized. Glandularia enlarged (Dgl-4 50-60 µm), with irregular margins due to secondary sclerotization ( Figure 4A ). Mediocaudal margin Cx-I truncate or slightly convex, apodemes of Cx-II in an obtuse angle in relation to idiosoma midline. Acetabula in an obtuse triangle. Excretory pore smooth; Vgl-1 generally not fused to Vgl-2 (except for older specimens, Figure 5E ).

Palp with a weak sexual dimorphism, ventral margins P-2 straight, slightly convex in distal part, P-3 straight or slightly concave, P-4 straight, only slightly protruding near insertion of proximoventral seta, sword seta insertions near distoventral seta ( Figures 5 C-D). I-L-5 with

S-1 longish and bluntly pointed, S-2 thicker, proximally enlarged, distance S-1-2 short; I-L-6 proximally slightly thickened, slightly curved, from the centre to the claw furrow with parallel dorsal and ventral margins ( Figures 5 A-B). Male — Genital plate anterior margin slightly convex ( Figure 4B ); P-2 ventral margin slightly convex in distal part ( Figure 5C ). Female — Pregenital sclerite large, gonopore extending far over the anterior margin of the genital plates, medial margin forming an obtuse angle between Ac-1 and Ac-3 ( Figure 5E ).

Measurements. Male —Idiosoma L 519, W 325; maximum diameter Dgl-4, 48-53. Coxal shield L 313; Cx-III W 319; Cx-I+II mL 99, Cx-I+II lL 188. Genital field L/W 110/120, ratio 0.91, L Ac-1-3: 30-31, 31-34, 33-36. Ejaculatory complex L 104.

Gnathosoma — Palp total L 283; dL/H, dL/H ratio: P-1, 28/25, 1.12; P-2, 59/44, 1.35; P-3, 67/35, 1.9; P-4, 93/31, 3.0; P-5, 36/15, 2.4; length ratio P-2/P-4 0.63. Chelicera total L 178.

Legs — I-L-5 dL 156, vL 114, dL/vL ratio 1.37, maximum H 45, dL/maximum H 3.5, S-1 L 81, L/W ratio 8.7, S-2 L 74, L/W ratio 6.2, distance S-1-2, 11, dL ratio S-1/2 1.1; I-L-6 dL 105, central H 28, dL/central H ratio 3.7; L I-L-5/6 ratio 1.49.

Female — Idiosoma L 737; maximum diameter Dgl-4, 63. Coxal shield L 333; Cx-III W 388; Cx-I+II mL 94, Cx-I+II lL 191. Genital field L/W 188/171, genital plates L 109-111, pregenital sclerite W 147, gonopore L 155, L Ac-1-3: 40-41, 39-42, 34. Egg maximum diameter (n = 2) 162-163.

Gnathosoma — Palp total L 332; dL/H, dL/H ratio: P-1, 32/30, 1.07; P-2, 70/46, 1.52; P-3, 86/38, 2.2; P-4, 106/29, 3.65; P-5, 38/14, 2.8; length ratio P-2/P-4 0.67. Gnathosoma vL 123;

chelicera total L 201.

Legs — I-L-5 dL 181, vL 126, dL/vL ratio 1.43, maximum H 52, dL/maximum H 3.5, S-1 L 96, L/W ratio 8.2, S-2 L 77, L/W ratio 5.8, distance S-1-2, 16, dL ratio S-1/2 1.24; I-L-6 dL

114, central H 29, dL/central H ratio 3.9; L I-L-5/6 ratio 1.58.

Etymology — The new species is named after the Karakal region from where it originates. Discussion — In the combination of extended glandularia (maximum diameter> 40 µm), and the morphology of I-L, the new species is similar to A. glandulosus (Walter, 1918) , a rhitrobiontic species known from the Alps, southern Germany and the Pyrenees ( Gerecke 2003 ;

Smit et al. 2015). Males of the latter species differ in Vgl-3 fused to posterior margin of Cx-IV, P-2 with distoventral projection and the P-4 sword seta inserting near the proximoventral seta, both sexes in stouter I-L-5 (ratio dL/maximum H 2.6 –3.0) with wider S-1-2 setal interspace (˃

15 in ♂, ˃ 20 µm in ♀).

Distribution — Kyrgyzstan ; only known from a stream (see Fig 18B in Pešić and Smit

2020) in the Tien Shan mountains at an elevation of about 1,600 meters.

Figures

Figure 4 Atractides karakalin. sp., ♂ holotype, KR8 Kalman Ashu, Kyrgyzstan. A – idiosoma, dorsal view; B – idiosoma, ventral view. Scale bar = 100 µm.

Figure 5 Atractides karakalin. sp., KR8 Kalman Ashu, Kyrgyzstan (A, C, ♂ holotype; B, D-E, ♀ paratype). A-B – I-L-5 and -6; C – palp, lateral view; D – palp, medial view; E – genital field. Scale bars = 100 µm.