Monatractides neoapratima ( Wiles, 1991 )

Pesic, Vladimir & Smit, Harry, 2009, Water mites of the family Torrenticolidae (Acari: Hydrachnidia) from Thailand, Part II. The genus Monatractides K. Viets, Zootaxa 2012, pp. 1-27 : 2

Monatractides neoapratima ( Wiles, 1991)

( Figs. 1–6 )

Material. Thailand: Pong Creek crossing road to Muang Kong, Doi Chiang Dao, 477 m asl, 22.xi.2007, 19° 24.774 N 98° 55.127 E, leg. Smit 0/1/0 (0/1/0 mounted); stream W of Bankrang Camp, Kaeng Krachan NP, 30.xi.2007, 12° 48.106 N 99° 26.786 E, leg. Smit 3/3/0 (0/1/0 mounted); Thorntip Waterfall, Kaeng Krachan NP, 29.xi.2007, 12° 50.952 N 99° 18.498 E, leg. Smit 1/0/0.

Morphology. Female (from Pong Creek): Idiosoma (ventral view: Fig. 2 ) L 656, W 456; dorsal shield ( Fig. 1 ) L 562, W 394, L/W ratio 1.4; dorsal plate L 531; shoulder plate L 122, W 47, L/W ratio 2.6; frontal plate L 113, W 47, L/W ratio 2.4; shoulder/frontal plate L ratio 1.08; capitular bay L 132, W 52, L/W ratio 2.5; Cx-1 total L 228, Cx-1 medial L 94, Cx-2+3 medial 38; ratio Cx-1 L/Cx-2+3 medial L 6.0; Cx-1 medial L/Cx-2+3 medial L 2.5; genital field L/W 108/84, L/W ratio 1.3; distance genital field–excretory pore 147, genital field–caudal idiosoma margin 229; capitulum ( Fig. 3 ) ventral L 145; chelicera L 176; palp ( Figs. 4–5 ) total L 191, L and %L (given as % of total L): P-1 23 (12.0), P-2 61 (31.9), P-3 34 (17.8), P-4 52 (27.2), P-5 21 (11.0); P-2/P-4 ratio 1.17; straight stout seta on ventral P-2 and P-3; L I-Leg-4-6 ( Fig. 6 ): 91, 94, 88.

Remarks. Due to the shape of capitular bay which is rectangular at its proximal end, narrow frontal platelets and shoulder dorsal plates which are not swollen anteriorly, the specimens from Thailand agree well with the description given by Wiles (1991) for the specimens from Malaysia.

Distribution. Malaysia. New for Thailand.

Figures

FIGURES 1 – 6. Monatractides neoapratima Wiles, female, Pong Creek: 1 = dorsal shield; 2 = idiosoma, ventral view; 3 = capitulum; 4 = palp (P- 1 missing), medial view; 5 = palp, lateral view; 6 = I-Leg- 4 - 6. Scale Bars = 100 µm.