Monatractides humilis, Pešić, Vladimir & Smit, Harry, 2011

Pešić, Vladimir & Smit, Harry, 2011, Water mites of the genus Monatractides Viets (Acari: Hydrachnidia, Torrenticolidae) from New Guinea, with descriptions of nine new species, Zootaxa 2779, pp. 39-62 : 58-61

Monatractides humilis sp. nov.

( Fig. 17 )

Type series. Holotype, male, dissected and slide mounted; Indonesia, New Guinea, Papua Province: River Pos 7, Sentani, 9.iii.2010, 2˚ 33.740 S 140˚ 30.784 E, 103 m a.s.l.. Paratypes: 1/1 (mounted), same data as holotype; 8/5 (2/ 2 mounted), River Yabawi, upstream of Harapan, 28.iii.2010, 2˚ 34.216 S 140˚ 33.723 E, 120 m a.s.l.

Diagnosis. Idiosoma L <900 in males, <1000 in females; area of primary sclerotization of the dorsal plate with four dorsoglandularia; capitular bay narrow (L/W ratio ca. 3.0); distal margins of P-2 and -3 without denticles, P-4 with well well visible denticle near the insertion of the ventral hairs, P-4 L/H 2.2 – 2.3; postgenital area large; excretory pore away from the line of primary sclerotization, Vgl-2 posterior and well separated from the excretory pore.

Description. Male (holotype, in parentheses paratype from River Pos 7, in square brackets paratype from River Yabawi): Idiosoma (ventral view: Fig. 17B ) L 788 (813) [878], W 543 (537) [576]; dorsal shield ( Fig. 17A ) L 625 (697) [681], W 481 (488) [500], L/W ratio 1.3 (1.43) [1.36]; dorsal plate 597 [644]; shoulder plate L 153 (184) [168], W 69 (75) [72], L/W ratio 2.2 (2.5) [2.3]; frontal plate L 113 (128) [131], W 47 (59) [61], L/W ratio 2.4 (2.2) [2.15]; shoulder/frontal plate L ratio 1.35 (1.44) [1.28]; capitular bay L 169 (178) [194], W 59 (67) [66], L/W ratio 2.9 (2.7) [2.9]; Cx-1 total L 284 (297) [325], Cx-1 medial L 114 (119) [131], Cx-2+3 medial 76 (81) [74]; ratio Cx-1 L/Cx-2+3 medial L 3.7 (3.7) [4.39]; Cx-1 medial L/Cx-2+3 medial L 1.5 (1.47) [1.77]; genital field L/W 160 (172) [179]/113 (118) [126], L/W ratio 1.4 (1.46) [1.42], ejaculatory complex ( Fig. 17D ) L 189 (188); distance genital field–excretory pore 153 (158) [170], genital field–caudal idiosoma margin 259 (253) [281]; capitulum ( Fig. 17G ) ventral L 188 (202) [213]; chelicera total L 222 (234) [250]; palp ( Fig. 17G ) total L 207 (212) [229], dL: P-1, 28 (29) [33]; P-2, 59 (62) [68]; P-3, 39 (42) [42]; P-4, 58 (55) [60]; P-5, 23 (24) [26]; %L: P-1, 13.5 (13.7) [14.4]; P-2, 28.5 (29.2) [29.7]; P-3, 18.8 (19.8) [18.3]; P-4, 28.0 (26.0) [26.2]; P-5, 11.1 (11.3) [11.4]; P-2/P- 4 ratio, 1.02 (1.13) [1.14]; L I-L-4-6 ( Fig. 17C ): 114 (119) [128], 114 (125) [130], 115 (116) [126].

Female (from River Pos 7, in parentheses paratype from River Yabawi): Idiosoma (ventral view: Fig. 17 H) L 925 (975), W 625 (669); dorsal shield L 744 (794), W 550 (563), L/W ratio 1.35 (1.4); dorsal plate 706 (759); shoulder plate L 197 (191), W 78 (78), L/W ratio 2.5 (2.45); frontal plate L 124 (141), W 59 (59), L/W ratio 2.1 (2.39); shoulder/frontal plate L ratio 1.59 (1.36); capitular bay L 194 (200), W 72 (72), L/W ratio 2.7 (2.8); Cx-1 total L 319 (325), Cx-1 medial L 125 (125), Cx-2+3 medial 59 (68); ratio Cx-1 L/Cx-2+3 medial L 5.4 (4.8); Cx-1 medial L/Cx-2+3 medial L 2.1 (1.8); genital field L/W 188 (194)/154 (158), L/W ratio 1.22 (1.23); distance genital field–excretory pore 200 (197), genital field–caudal idiosoma margin 350 (367); capitulum ventral L 225 (222); chelicera total L 257 (259); palp total L 240 (245), dL: P-1, 33 (34); P-2, 69 (71); P-3, 45 (46); P-4, 65 (66); P-5, 28 (28); %L: P-1, 13.8 (13.9); P-2, 28.8 (29.0); P-3, 18.8 (18.8); P-4, 27.1 (26.9); P-5, 11.7 (11.4); L P-2/P-4 ratio, 1.06 (1.08); L I-L-4-6: 129 (132), 125 (132), 119 (127).

Etymology. Named for its occurrence at lower elevations.

Discussion. See discussion section under the preceeding species.

Distribution. New Guinea.

Figures

FIGURE 17 A – G. Monatractides humilis sp. nov. (A – G = male, H = female): A = dorsal shield; B, H = ventral shield; C = I-L- 5 and - 6; D = ejaculatory complex; E = palp, medial view; F = palp, lateral view; G = capitulum. Scale bars = 100 µm.