Atractides (Atractides) indentatus, PešićK & SmitK & GurungK, 2023

PešićK, Vladimir, SmitK, Harry & GurungK, Mer Man, 2023, Five new species of water mite genus Atractides Koch, 1837 from Bhutan with new records (Acari: Hydrachnidia: Hygrobatidae), Acarologia 63 (1), pp. 148-168 : 161

Atractides (Atractides) indentatus sp. nov.

Zoobank: A07B4D67-582A-48DA-AD8C-D60DC8C3E700

Figures 9-10

Type material — Holotype ♂, dissected and slide mounted ( NBC), Bhutan, MG3 Bipgang Chhu , 27.15729°N, 90.66721°E, 596 m asl, 25 Oct. 2021 . Paratypes: 4♀, same site and data as the holotype, 1♀ dissected and slide mounted ( NBC).

Diagnosis — Integument finely striated, muscle insertions unsclerotized; mediocaudal margin Cx-I+II deeply indented; Vgl-1 separate from Vgl-2; strong sexual dimorphism (in male P-2 with pointed distoventral projection, P-4 shortened, P-2/P-4 ratio 0.94), anterior margin of the male genital plate with a V-shaped indentation.

Description — General features – Integument striated, muscle insertions unsclerotized; mediocaudal margin Cx-I+II deeply indented ( Figures 9A, 10A), caudal apodemes of Cx-II strongly protruding and forming an acute angle. Excretory pore smooth; Vgl-1 not fused to Vgl-2. Palp with a strong sexual dimorphism, P-4 sword seta stout, nearer to distoventral setae. I-L-5 setae S-1 and S-2 nearer to each other, bluntly pointed, S-1 longer than S-2; I-L-6 stout, proximally thickened, slightly curved ( Figures 9D, 10C).

Male – Anterior and posterior margin of genital plate deeply indented, anterior indentation V-shaped, P-2 ventral margin with a strongly developed pointed distal extension, P-3 slightly concave, P-4 shortened, ventral margin slightly protruding at level of ventral setae ( Figure 9C).

Female – P-2 ventral margin convex distally, P-3/4 straight, P-4 slender than in male ( Figure 10B).

Measurements — Male – Idiosoma L 390, W 319; maximum diameter Dgl-4, 17. Coxal shield L 241; Cx-III W 280; Cx-I+II mL 63, Cx-I+II lL 150. Genital field L/W 101/118, ratio 0.85, L Ac-1-3: 39-41, 44-47, 34-36.

Palp – Total L 228; dL/H, dL/H ratio: P-1, 23/26, 0.91; P-2, 56/45, 1.24; P-3, 56/36, 1.57;

P-4, 60/31, 1.97; P-5, 33/13, 2.62; L ratio P-2/P-4, 0.94.

Legs – I-L-5 dL 142, vL 98, dL/vL ratio 1.46, maximum H 44, dL/maximum H 3.25, S-1 L

59, L/W ratio 5.3, S-2 L 53, L/W ratio 4.9, distance S-1-2, 5.0, dL ratio S-1/2, 1.12; I-L-6 dL

97, central H 20, dL/central H ratio 4.77; L I-L-5/6 ratio 1.47.

Female – Idiosoma L 594, W 447; maximum diameter Dgl-4, 20. Coxal shield L 325; Cx-III W 391; Cx-I+II mL 63, Cx-I+II lL 175. Genital field L/W 144/164, genital plates L 109, pregenital sclerite W 59, gonopore L 103, L Ac-1-3: 41-47, 52-54, 47.

Palp – Total L 295; dL/H, dL/H ratio: P-1, 28/30, 0.94; P-2, 63/44, 1.43; P-3, 78/40, 1.96;

P-4, 85/27, 3.2; P-5, 41/15, 2.74; L ratio P-2/P-4, 0.73. Gnathosoma vL 72, chelicera total L

173.

Legs – I-L-5 dL 198, vL 145, dL/vL ratio 1.36, maximum H 51, dL/maximum H 3.9, S-1

L 77, L/W ratio 5.18, S-2 L 65, L/W ratio 4.41, distance S-1-2, 7.0, dL ratio S-1/2, 1.17; I-L-6

dL 125, central H 25, dL/central H ratio 5.0; L I-L-5/6 ratio 1.58.

Etymology — The specific name refers to deeply indented mediocaudal margin of Cx-I+II.