Monatractides oman Gerecke, 2004

Smit, H. & Pesic, V., 2010, New Species Of Water Mites From Oman, With Some Zoogeographical Notes (Acari: Hydrachnidia), Acarologia 50 (2), pp. 151-195 : 162-163

Monatractides oman Gerecke, 2004

( Figures 8 A-C)

Material examined — 4/5/1 (1/1/0 mounted), stream Wadi Bani Auf, 23°16.699 N 57°27.690 E, alt. 571 m, 13-xi-2008 ; 0/2/0 (0/1/0 mounted), Ayn Tabraq , captured spring, 17°06.034 N 54°19.599 E, 7-xi-2008 ; 3/1/0 (1/0/0 mounted), Ayn Tabraq , stream, 17°06.034 N 54°19.599 E, 7-xi-2008 ; 9/9/1, Ayn Hamran , captured spring, 17°05.842 N 54°16.886 E, 3-xi-2008 ; 0/1/0, stream Hatta Pools , 24°41.165 N 56°09.556 E, alt. 421 m, 15-xi-2008 ; 2/0/0, Wadi Hanna , 17°04.236 N 54°36.489 E, 4-xi- 2008; 1 juvenile / 0/1, small cascading stream Wadi Ghul , 23°09.702 N 57°12.151 E, 12-xi-2008 ; 6/3/0 (1/0/0 mounted), Ayn Razat , 17°07.807 N 54°14.231 E, 3-xi-2008 ; 3/8/0, stream Wadi Ghul , 23°10.297 N 57°11.996 E, alt. 805 m, 12-xi-2008 .

Description

Male — (from Wadi Bani Auf, in parentheses specimen from Ayn Tabraq). Idiosoma L 881 (963), W 650 (788); dorsal shield L 734 (794), W 500 (619), L/W ratio 1.47 (1.28); dorsal plate L 675 (719); shoulder plate L 239 (255), W 84 (94), L/W ratio 2.9 (2.7); frontal plate L 126 (119), W 81 (94) ratio 1.6 (1.3); shoulder/frontal plate L ratio 1.9 (2.1); capitular bay L 164 (189); total L 267 (319), Cx-I medial L 103 (131), Cx-II+III medial 128 (125); ratio Cx-I L/Cx-II+III medial L 2.1 (2.6); Cx-I medial L/Cx-II+III medial L 0.8 (1.05); genital field L/W 144 (164)/120 (141), L/W ratio 1.2 (1.16); ejaculatory complex L 173 (219); distance genital field-excretory pore 188 (205), genital field-caudal idiosoma margin 328 (344); capitulum ventral L 205 (218); chelicera L 235 (270), basal segment L/H (222/33), claw L (49), basal segment/claw ratio (4.5), L/H ratio (6.7); palp: total L 227 (250), L: P-1, 26 (29); P-2, 72 (83); P-3, 43 (47); P-4, 58 (63); P-5, 28 (28); %L: P-1, 11.5 (11.6); P-2, 31.7 (33.2); P-3, 18.9 (18.8); P-4, 25.6 (25.2); P-5, 12.3 (11.2); P-2/P-4 ratio 1.24 (1.3).

Female — (from Wadi Bani Auf). Idiosoma (ventral view: Fig. 8B ) L 938, W 681; dorsal shield ( Fig. 8A ) L 744, W 538, L/W ratio 1.38; dorsal plate L 694; shoulder plate L 237, W 75, L/W ratio 3.16; frontal plate L 126, W 78, L/W ratio 1.6; shoulder/frontal plate L ratio 1.9; capitular bay L 175; Cx-I total L 280, Cx-I medial L 104, Cx-II+III medial 100; ratio Cx- I L/Cx-II+III medial L 2.8; Cx-I medial L/Cx-II+III medial L 1.04; genital field L/W 165/159, L/W ratio 1.04; egg maximum diameter L 206; distance genital field-excretory pore 213, genital field-caudal idiosoma margin 366; capitulum ventral L 209; chelicera L 243; palp ( Fig. 8C ): total L 237, L and %L (in parentheses): P-1, 29 (12.2); P-2, 75 (31.6); P-3, 43 (18.1); P-4, 62 (26.2); P-5, 28 (11.8); P-2/P-4 ratio 1.2.

Remarks — The original description ( Gerecke, 2004) of this species was based on a single male and two juvenile female specimens from Rustaq, Wadi Al Fara, Oman (23°28’06" N 57°27’00" E). Gerecke (2004) stated that the juvenile females are probably atypical in idiosoma shape and therefore not included in the type series. As no illustration has been given of the mature female we give additional figures here based on the specimen from Wadi Bani Auf.

Distribution — Oman.

Figures

FIGURE 8: Monatractides oman Gerecke, 2004, female: (A) – dorsal shield; (B) – idiosoma, ventral view; (C) – palp, medial view. Scale bars = 100 µm.