Monatractides circuloides ( Halík, 1930 ), Halik, 1930

Pesic, Vladimir & Smit, Harry, 2010, New records of water mites (Acari: Hydrachnidia) from Malaysia, with descriptions of three new species, Zootaxa 2354, pp. 19-34 : 26

Monatractides circuloides ( Halík, 1930)

( Fig. 6A–B )

Material. Malaysia: unnamed creek crossing Road 55 to Kuala Kubu Bharu, 3° 40.511N 101° 44.511 E, alt. 823 m, 18.ii.2009, 1/0/0 (mounted); River Gumut at crossing with road 55, 3° 37.155 N 101° 44.558 E, 18.ii.2009, 2/1/0; stream crossing road to Ringlet, Cameron Highlands, 4° 22.212 N 101° 21.522 E, alt. 1011 m, 18.ii.2009, 1/0/0.

Morphology. Male: Idiosoma (ventral view: Fig. 6B ) L 881, W 675; dorsal shield ( Fig. 6A ) L 763, W 569, L/W ratio 1.34; dorsal plate 700; frontal plate L 138, W 59, L/W ratio 2.3; shoulder plate L 256, W 94, L/ W ratio 2.7; shoulder/frontal plate L ratio 1.86; gnathosomal bay L 184, its lateral margin with the three pairs of knob-shaped protrusions; Cx-1 total L 334, Cx-1 medial L 150, Cx-2+3 medial 109; ratio Cx-1 L/Cx-2+3 medial L 3.06; Cx-1 medial L/Cx-2+3 medial L 1.38; genital field L/W 170/134, L/W ratio 1.27; ejaculatory complex L 213; distance genital field–excretory pore 192, genital field–caudal idiosoma margin 259; capitulum ventral L 191; chelicera L 219; palp: dL: P-2, 69; P-3, 42; P-4, 54; P-5, 27; L P-2/P-4 ratio, 1.28; P- 4 with well visible denticle near the insertion of the ventral setae.

Remarks. Halík (1930) described Monatractides circuloides based on a single female from the S. Batung Padang, Cameron Highlands, Perak, Malaysia. The male of M. circuloides is described by Pesic & Smit (2009b) based on specimens from Thailand. As no male specimen has so far been found in Malaysia we give here an additional description based on the specimen from the wide area of the locus typicus ( Cameron Highlands, Perak). The specimen from Malaysia agrees well with specimens from Thailand, although it is larger (see: Pesic & Smit 2009b).

Distribution. Malaysia, Thailand.

Figures

FIGURE 6 A – B. Monatractides circuloides (Halík, 1930), male: A = dorsal shield; B = ventral shield. Scale Bar = 100 μm.