Second contribution to the knowledge of water mites of the genus Monatractides K. Viets (Acari: Hydrachnidia, Torrenticolidae) from New Guinea, with descriptions of three new species Author Pešić, Vladimir Author Smit, Harry text Zootaxa 2012 3350 46 57 journal article 10.5281/zenodo.281539 298e87c1-312d-4c83-a61e-7962a05c4035 1175-5326 281539 Monatractides ( Monatractides ) neoaustralicus sp. nov. (Figs. 6A–F, 7A–B) Type series. Holotype , male, dissected and slide mounted, Indonesia , New Guinea , West Papua province: stream ca. 3 km S of Mokwam, 08.xi.2011 , 1˚ 05.877 S , 133˚ 54.223 E , alt. 1637 m asl. Paratypes : one female, same data as holotype , dissected and slide mounted. Diagnosis. Area of primary sclerotization of the dorsal plate with four dorsoglandularia; capitular bay slender (L/W ratio 3.1–3.3); posterior suture line of Cx-4 well accentuated and directed posterolaterally; excretory pore posterior to the line of primary sclerotization, Vgl-2 posterior to excretory pore; distal margins of P-2 and -3 without denticles, P-4 ventral hairs small, inserted more distally; I-L-6 relatively stout (L/H ratio 2.4). Male: medial suture line of Cx-2+3 short (70 μm); genital field relatively wide (L/W ratio 1.2). 6A–F. Monatractides neoaustralicus sp. nov . , male, stream ca. 3 km S of Mokwam: A = dorsal shield; B = ventral shield; C = palp, medial view; D = capitulum; E = I-L-5 and -6; F = ejaculatory complex. Scale bars = 100 μm. FIGURES 7A–B. Monatractides neoaustralicus sp. nov . , female, stream ca. 3 km S of Mokwam: A = ventral shield; B = palp, lateral view. Scale bars = 100 μm. Description. Male ( holotype ): Idiosoma: (ventral view: Fig. 6B) L 788, W 534; dorsal shield (Fig. 6A) L 659, W 456, L/W ratio 1.45; dorsal plate 613; shoulder plate L 184, W 66–69, L/W ratio 2.7–2.8; frontal plate L 134–138, W 66–69, L/W ratio 2.0–2.2; shoulder/frontal plate L ratio 1.33–1.37; capitular bay L 166, W 53, L/W ratio 3.1; Cx-1 total L 291, Cx-1 medial L 125, Cx-2+3 medial L 70; ratio Cx-1 L/Cx-2+3 medial L 4.2; Cx-1 medial L/Cx-2+3 medial L 1.8; genital field L/W 153/125, L/W ratio 1.22; ejaculatory complex (Fig. 6F) L 178; distance genital field–excretory pore 166, genital field–caudal idiosoma margin 269; capitulum (Fig. 6D) ventral L 186; palp (Fig. 6C) total L 199, dL: P-1, 32; P-2, 54; P-3, 42; P-4, 54; P-5, 17; L P-2/P-4 ratio, 1.0; L I-5-6 (Fig. 6E): 102, 94; I-L-6 L/H ratio, 2.35. Female: Idiosoma: (ventral view: Fig. 7A ) L 847, W 575; dorsal shield (Fig.) L 706, W 497, L/W ratio 1.42; dorsal plate 656; shoulder plate L 198–200, W 74–77, L/W ratio 2.6–2.7; frontal plate L 134–136, W 69–72, L/W ratio 1.9–2.0; shoulder/frontal plate L ratio 1.47–1.48; capitular bay L 166, W 51, L/W ratio 3.3; Cx-1 total L 296, Cx-1 medial L 130, Cx-2+3 medial L 48; ratio Cx-1 L/Cx-2+3 medial L 6.2; Cx-1 medial L/Cx-2+3 medial L 2.7; genital field L/W 178/165, L/W ratio 1.1; distance genital field–excretory pore 172, genital field–caudal idiosoma margin 309; capitulum ventral L 174; chelicera total L 209; palp ( Fig. 7B ) total L 193, dL: P-1, 32; P-2, 55; P-3, 39; P-4, 51; P-5, 16; L P-2/P-4 ratio, 1.08. Etymology. Named for its resemblance to Monatractides australicus ( Cook, 1986 ) . Discussion. Monatractides neoaustralicus sp. nov . and M . rivulus sp. nov. (see below) belong to the M. macroporus (K. Viets, 1935) species-complex (see: Pešiċ & Smit 2009 ). Due to the general shape of idiosoma and palp, M. neoaustralicus sp. nov . most closely resembles M. australicus ( Cook, 1986 ) , a species widespread in Australia ( Pešiċ & Smit 2012 ). The latter species differs from M. neoaustralicus sp. nov. (and other species of the macroporus -complex from New Guinea ) in the excretory pore lying in an indentation of the line of primary sclerotization, while the area of primary sclerotization generally extends more to the posterior margin of the ventral shield, and consequently, Vgl-2 is shifted less away from the excretory pore. Moreover, P-2 and P-3 have more slender, hair-like ventral setae. Two other previously described members of the macroporus -group from New Guinea , Monatractides humilis Pešiċ & Smit 2011 and M. alticolus Pešiċ & Smit, 2011 , can be distinguished in the male by a more elongated genital field (L/W ratio 1.4–1.5 in M. humilis and M. alticolus vs. 1.2 in M. neoaustralicus sp. nov . ). Other differences are the well pronounced denticle near the insertion of the ventral hairs in M. humilis and the major idiosoma and gnathosoma dimensions in M. alticolus . Distribution. New Guinea (West Papua province); only known from the locus typicus ( Fig. 9A ).