Monatractides cf. garhwaliensis Pesic, N. Kumar & K. Kumar, 2007

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 : 16-17

Monatractides cf. garhwaliensis Pesic, N. Kumar & K. Kumar, 2007

( Figs. 63–68 )

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); river at km. 13, 465 m asl, Doi Inthanon NP, 25.xi.2007, 18° 31.532 N 98° 39.091 E, leg. Smit 0/1/0 (0/1/0 mounted); stream near Ban Khoom, 756 m asl, Doi Ang Kang, 20.xi.2007, 19° 56.905 N 99° 0 3.938 E leg. Smit 0/1/0; stream downstream of Huoay Meng Waterfall, between Chiang Saen, And Chiang Khong, 20.xi.2007, 20° 18.095 N 100° 22.454 E, leg. Smit 0/1/0.

Morphology. Female (Pong Creek, in parentheses specimen from River at km.13): Idiosoma (ventral view: Fig. 64 ) L 584 (575), W 313 (313); dorsal shield ( Fig. 63 ) L 469 (469), W 281 (272), L/W ratio 1.67 (1.7); dorsal plate L 444 (438); shoulder plate L 130 (133), W 41 (38), L/W ratio 3.2 3.5); frontal plate L 87 (88), W 34 (34), L/W ratio 2.6 (2.6); shoulder/frontal plate L ratio 1.5 (1.5); capitular bay L 119 (125), W 34 (36), L/W ratio 3.5; Cx-1 total L 216 (234), Cx-1 medial L 98 (109), Cx-2+3 medial 36 (45); ratio Cx-1 L/Cx- 2+3 medial L 6.0; Cx-1 medial L/Cx-2+3 medial L 2.7; fourth coxae close together posterior to the genital field; genital field egg-shaped, L/W 123 (119)/78 (69), L/W ratio 1.6 (1.7); distance genital field–excretory pore 181 (175), genital field–caudal idiosoma margin 209 (200); capitulum ( Fig. 67 ) ventral L 156 (161); chelicera L 180 (179); palp ( Fig. 66 ) total L 157 (159), L: P-1 21 (23), P-2 46 (44), P-3 31 (30), P-4 39 (39), P-5 20 (20); %L (given as % of total L): P-1 13.4 (14.5), P-2 29.3 (27.7), P-3 19.7 (18.9), P-4 24.8 (24.5), P-5 12.7 (12.6); P-2/P-4 ratio 1.18 (1.13); ventral side of P-4 with short setae and no tubercles; L I-Leg-4-6 ( Fig. 68 ): 71 (73), 75 (71), 85 (80); I-Leg-6 L/W ratio (2.1).

Remarks. Due the elongated idiosoma (e.g., dorsal shield L/W>1.6), excretory pore and Vgl-1/2 fused with the area of primary sclerotization, genital field elongated and more enlarged anteriorly, capitulum with elongated rostrum and Cx-4 posteriorly strongly extended beyond the genital field, the specimens from Thailand agree well with the description given by Pesic et al. (2007) for Monatractides garhwaliensis , a species described from a single female specimen from Western Himalayas ( India). However, due to the fact that we do not have male specimens, this is only a tentative assignment. The variability of further specimens needs to be examined to clarify the taxonomy.

Distribution. India (Garhwal Himalayas). New for Thailand.

Figures

FIGURES 63 – 68. Monatractides cf. garhwaliensis Pesic, N. Kumar & K. Kumar, female, Pong Creek: 63 = dorsal shield; 64 = idiosoma, ventral view; 65 = anterodorsal portion of ventral shield; 66 = palp, medial view; 67 = capitulum; 68 = I-Leg- 5 - 6. Scale Bars = 100 µm.