Water mites of the genus Monatractides Viets (Acari: Hydrachnidia, Torrenticolidae) from New Guinea, with descriptions of nine new species Author Pešić, Vladimir Author Smit, Harry text Zootaxa 2011 2779 39 62 journal article 10.5281/zenodo.207512 5251f1d8-f451-49f6-9a68-2f336183a188 1175-5326 207512 Key to the Monatractides species from Papua Province (New Guinea , Indonesia ) 1 Dorsal shield with two free anterior platelets, shoulder and frontal platelets of each side fused ( Fig. 12A )..................................................................................................... Monatractides sahuli - Dorsal shield with four free anterior platelets, shoulder and frontal platelets of each side not fused ( Figs. 2A , 3A )......... 2 2 The secondary sclerotization slightly developed, the area of primary sclerotization of the dorsal and ventral plate extending almost to the posterior margin of the dorsal or ventral shield, respectively, excretory pore incorporated into primary sclerotization of the ventral shield ( Figs. 10B , 11B ),.................................................................3 - The secondary sclerotization well developed, the area of primary sclerotization of the dorsal and ventral plate not extending to the posterior margin of the dorsal or ventral shield, respectively, excretory pore not incorporated into primary sclerotization of the ventral shield ( Figs. 2B , 3B ).......................................................................... 4 3 Ventral margin of P-2 and -3 with straight stout seta ( Figs. 10D – E ), frontal platelets narrow (L/W 2.4) ( Fig. 10A ).......................................................................................... Monatractides sentanicus - Ventral margin of P-2 and -3 with slender ( Fig. 11C ), a hair-like seta, frontal platelets broad (L/W 1.7) ( Fig. 11A )........................................................................................... Monatractides abepurus 4 Cx-1 short and anteriorly broad, capitular bay relatively wide (L/W <2.5) ( Figs. 2B , 3B , 5B , 7B , 9 ) ( Monatractides luteus - species-complex)...................................................................... 5 - Cx-1 elongated and anteriorly slender, capitular bay relatively narrow (L/W> 2.5) ( Figs. 16A , 17B , H) ( Monatractides macroporus – species complex)......................................................................... 9 5 Idiosoma slender (dorsal shield L/W> 1.6) ( Figs. 2A , 3A , 5A ).................................................. 6 - Idiosoma more rounded (dorsal shield L/W <1.5) ( Figs. 7A , 14A , 17A ).......................................... 8 6 Capitular bay rectangular at its proximal end, genital field wide (L/W <1.4) ( Figs. 2B , 3B )........................... 7 - Capitular bay more rounded at its proximal end, genital field slender (L/W 1.6 in male) ( Fig. 5B ). .. Monatractides nipsanicus 7 Large in size (idiosoma length 900 – 1100 µm), Cx-4 with well accentuated posterior suture line ( Figs. 3B , 4B ), distal margins of P-3 bearing at least one denticle ( Figs. 3D – E ).......................................... Monatractides papuensis - Smaller in size (idiosoma length 700 – 800 µm), Cx-4 with slightly accentuated posterior suture line ( Figs. 2B , 4A ), distal margins of P-3 without denticles ( Fig. 2E )............................................... Monatractides novaeguineae 8 Frontal platelets narrow (L/W> 2.0) ( Fig. 7A ), P-4 with small denticle near the insertion of the ventral hairs ( Figs. 8A – B )....................................................................................... Monatractides bionus - Frontal platelets broad (L/W 1.8) ( Fig. 18A ), P-4 with well developed setal tubercles ( Fig. 18C ).... Monatractides papillatus 9 Large in size (idiosoma length 1100 – 1300 µm), P-4 slender (L/H 2.5 – 2.6), with less pronounced denticle near insertion of the ventral hairs, P-4 ventral hairs inserted more distally ( Figs. 15A , 16B )......................... Monatractides alticolus - Small in size (idiosoma length 700 – 1000 µm), P-4 stouter (L/H 2.2 – 2.3), with well visible denticle near the insertion of the ventral hairs, P-4 ventral hairs inserted less distally ( Figs. 17E – F ).............................. Monatractides humilis