Monatractides undetermined
Creators: name: Pešić, Vladimir
name: Smit, Harry
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Torrenticolidae
Monatractides
Monatractides undetermined

description: Key to the Monatractides species from Borneo
1 Gnathosoma cylindrical, elongated posterior to palp insertion, rostrum long and bent ventrally; P-5 almost reduced but clawlike setae of this segment lengthened and down-turned, partially hidden by the heavy setae at the distal margin of P-4....................................................................................... M. plumosa Wiles, 1987
- Gnathosoma laterally compressed, not elongated posterior to palp insertions, rostrum short; P-5 not reduced, claw-like setae normal in shape....................................................................................... 2
2 Frontal and shoulder platelets fused with dorsal plate forming an undivided dorsal shield............... M. phobetor n. sp
- Frontal and shoulder platelets not fused with dorsal plate...................................................... 3
3 Gnathosomal bay V-shaped, posteriorly equally narowed...................................................... 4
- Gnathosomal bay U-shaped, in posterior part with subparalel margins or slightly widened............................ 5
4 Gnathosomal bay with three pairs of knob-like protrusions at lateral margins, distal margin of P-3 and P-4 with several pointed extensions, ventral seta on P-4 long and away from distal edge........................... M. oxystomus (K. Viets, 1935)
- Gnathosomal bay without knob-like protrusions at lateral margins, distal margin of P-3 and P-4 straight, P-4 ventral setae short, not reaching the tip of P-5........................................................... M. phantasos n. sp.
5 Shoulder platelets much longer than frontal platelets (L/W ratio> 2.0,> 50 % length of dorsal plate)................................................................................................. M. circularis (K. Viets, 1935)
- Shoulder platelets shorter (L/W ratio <1.5, <50 % length of dorsal plate)......................................... 6
6 Gnathosomal bay narrow (L/W ratio> 3.0), Cx-I anteriorly slender and long....................................... 7
- Gnathosomal bay relatively wide (ratio L/W <3.0), Cx-I anteriorly broad and short................................ 10
7 Large in size (Idiosoma L> 1300 µm); posterior suture line of Cx-IV medially approaching and parallel to each other, distal margins of P-2 and P-3 with pointed extensions, ventral seta on P-4 thickened....................... M. heracles n. sp.
- Smaller in size (Idiosoma L <1000); posterior suture line of Cx-IV medially not parallel to each other; distal margins of P-2 and P-3 without pointed extensions, ventral seta on P-4 slender................................................. 8
8 Idiosoma slender (L/W ratio 1.7–1.8), suture line of Cx-IV lightly accentuated............ M. longiventris (K. Viets, 1939)
- Idiosoma broader (L/W ratio 1.4–1.5), posterior suture line of Cx-IV distinct...................................... 9
9 Ejaculatory complex normal with small proximal chamber, proximal and distal arms well developed, carina anterior long............................................................................... M. macroporus (K. Viets, 1935)
- Ejaculatory complex with large proximal chamber, proximal and distal arms short, carina anterior short.... M. epiales n. sp.
10 Frontal platelets distinctly longer than shoulder platelets (L/W ratio 0.7–0.8).............. M. parviventris (K. Viets, 1935)
- Frontal platelets shorter than shoulder platelets (L/W ratio> 1.0)............................................... 11
11 Large in size (Idiosoma L 800–1000 µm); posterior suture line of Cx-IV distinct, ventral setae on P-2 and P-3 slender; P-4 more slender.......................................................................... M. morpheus n. sp.
- Smaller in size (Idiosoma L <600 µm); posterior suture line of Cx-IV nearly obliterated; ventral setae on P-2 and P-3 thickened; P-4 stouter.................................................................. M. minuta n. sp. (female)
description: Published as part of Pešić, Vladimir & Smit, Harry, 2014, Torrenticolid water mites (Acari: Hydrachnidia: Torrenticolidae) from Malaysian Borneo, pp. 1-72 in Zootaxa 3840 (1) on pages 67-68, DOI: 10.11646/zootaxa.3840.1.1, http://zenodo.org/record/4927892