Vietnobates oryzae, Pešic & Smit, 2016

Pešic, V. & Smit, H., 2016, New records of water mites from Southeast Asia (Acari: Hydrachnidia) with the description of two new genera and 12 new species, Acarologia 56 (3), pp. 393-433 : 407-409

Vietnobates oryzae n. sp.

( Figure 9 )

Type material — Holotype female, dissected and slide mounted, Vietnam, 15-48-1, dam, ca. 35 km NW of Da Nang, 16°14’55.9"N, 107°47’31.0"E, alt. 38 m a.s.l., water depth 0.4 m, substrate: stones, gravel, between fresh and rotted leaves, 4.v.2015.

Diagnosis — (Male unknown). As for genus.

Description — Female: Integument striated; apodemes of Cx-II directed more posteriorly, Cx- IV posteromedial margin with a slightly protruding apodeme. Genital field with acetabula subtriangular in shape, in an obtuse triangle; excretory pore smooth, Vgl-1 separated from Vgl-2. P-2 ventral margin straight, distally forming a right angle, P-3 ventral margin straight or slightly concave; P-4 ventral setae at the same level ( Figures 9 B-C). Basal segment of chelicera dorsally with a pointed projection ( Figure 9E ). I-L-5 at distal end with a pair of thickened and pointed setae ( Figure 9D ); I-L-6 straight; leg claws with a well developed claw blade with dorsal and ventral clawlets ( Figure 9F ); III-L-5 with two and IV-L-5 with 3 swimming hairs, IV-L-6 with two long bristles.

Measurements — Idiosoma L/W 1110/820; coxal field L/W 353/605; Cx-III W 453; genital field L/W 188/241, genital plate L/W 100 – 103/44 – 47, gonopore L 163, pregenital sclerite W 72, postgenital sclerite W 93; egg maximum diameter (n–3) 147-156. Palp: total L 448, dL/H, dL/H ratio: P- 1, 31/48, 0.64; P-2, 125/78, 1.6; P-3, 86/68, 1.27; P- 4, 155/43, 3.6; P-5, 51/23, 2.2; L ratio P-2/P-4, 0.8; gnathosoma vL 131, with apodemes 278; chelicera total L 141, claw L 40, basal segment L 105, L basal segment/claw ratio 2.6. Legs: dL of I-L-2-5: 94, 125, 161, 178, 183; dL of IV-L: 150, 119, 169, 236, 228, 209.

Etymology — The name of the new species refers to the rice (– Latin oryza) field where the new species was found.

Distribution — Vietnam; known from the locus typicus only.

Figures

FIGURE 9: Vietnobates oryzae n. sp., female, dam NW of Da Nang, Vietnam: A – coxal and genital field; B-C – palp; D – I-L-5 and -6 (inset: distal part of I-L-5); E – chelicera; F – III-L claw. Scale bars – 100 µm.