Monatractides

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 : 61-62

publication ID	https://doi.org/ 10.5281/zenodo.207512
DOI	https://doi.org/10.5281/zenodo.6188352
persistent identifier	https://treatment.plazi.org/id/03F1878D-DC41-D83D-F9F4-C7C5C98EFE9C
treatment provided by	Plazi
scientific name	Monatractides
status

Treatment

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 View FIGURE 12 A – B )..................................................................................................... Monatractides sahuli

- Dorsal shield with four free anterior platelets, shoulder and frontal platelets of each side not fused ( Figs. 2A View FIGURE 2 A – G , 3A View FIGURE 3 A – G )......... 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 View FIGURE 10 A – F , 11B View FIGURE 11 A – E ),.................................................................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 View FIGURE 2 A – G , 3B View FIGURE 3 A – G ).......................................................................... 4

3 Ventral margin of P-2 and -3 with straight stout seta ( Figs. 10D – E View FIGURE 10 A – F ), frontal platelets narrow (L/W 2.4) ( Fig. 10A View FIGURE 10 A – F ).......................................................................................... Monatractides sentanicus

- Ventral margin of P-2 and -3 with slender ( Fig. 11C View FIGURE 11 A – E ), a hair-like seta, frontal platelets broad (L/W 1.7) ( Fig. 11A View FIGURE 11 A – E )........................................................................................... Monatractides abepurus

4 Cx-1 short and anteriorly broad, capitular bay relatively wide (L/W <2.5) ( Figs. 2B View FIGURE 2 A – G , 3B View FIGURE 3 A – G , 5B View FIGURE 5 A – B , 7B View FIGURE 7 A – B , 9 View FIGURE 9 ) ( Monatractides luteus - species-complex)...................................................................... 5

- Cx-1 elongated and anteriorly slender, capitular bay relatively narrow (L/W> 2.5) ( Figs. 16A View FIGURE 16 A – B , 17B View FIGURE 17 A – G , H) ( Monatractides macroporus – species complex)......................................................................... 9

5 Idiosoma slender (dorsal shield L/W> 1.6) ( Figs. 2A View FIGURE 2 A – G , 3A View FIGURE 3 A – G , 5A View FIGURE 5 A – B ).................................................. 6

- Idiosoma more rounded (dorsal shield L/W <1.5) ( Figs. 7A View FIGURE 7 A – B , 14A View FIGURE 14 A – B , 17A View FIGURE 17 A – G ).......................................... 8

6 Capitular bay rectangular at its proximal end, genital field wide (L/W <1.4) ( Figs. 2B View FIGURE 2 A – G , 3B View FIGURE 3 A – G )........................... 7

- Capitular bay more rounded at its proximal end, genital field slender (L/W 1.6 in male) ( Fig. 5B View FIGURE 5 A – B ). .. Monatractides nipsanicus

7 Large in size (idiosoma length 900 – 1100 µm), Cx-4 with well accentuated posterior suture line ( Figs. 3B View FIGURE 3 A – G , 4B View FIGURE 4 A – B. A ), distal margins of P-3 bearing at least one denticle ( Figs. 3D – E View FIGURE 3 A – G ).......................................... Monatractides papuensis

- Smaller in size (idiosoma length 700 – 800 µm), Cx-4 with slightly accentuated posterior suture line ( Figs. 2B View FIGURE 2 A – G , 4A View FIGURE 4 A – B. A ), distal margins of P-3 without denticles ( Fig. 2E View FIGURE 2 A – G )............................................... Monatractides novaeguineae

8 Frontal platelets narrow (L/W> 2.0) ( Fig. 7A View FIGURE 7 A – B ), P-4 with small denticle near the insertion of the ventral hairs ( Figs. 8A – B View FIGURE 8 A – D )....................................................................................... Monatractides bionus

- Frontal platelets broad (L/W 1.8) ( Fig. 18A View FIGURE 18 A – D ), P-4 with well developed setal tubercles ( Fig. 18C View FIGURE 18 A – D ).... 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 View FIGURE 15 A – D , 16B View FIGURE 16 A – B )......................... 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 View FIGURE 17 A – G ).............................. Monatractides humilis