Key to species identification
1a– Body length very long, 6 mm
1b – Body length shorter, less than 3.5 mm 2
2a – Stoma barrel-shaped or tubular; bursa peloderan (unknown in O
2b – Stoma tubular; bursa leptoderan or pseudopeloderan 16
3a – Each spicule visibly with different size
3b – Both spicules with similar size 4
4a – Female rectum scarcely longer than the anal diameter 5
4b – Female rectum ca. 2 to 3 times longer than the anal diameter 6
5a – Body length less than 750 µm; spicules 29 µm long
5b – Body length more than 750 µm; spicules 32 to 48 µm long
6a – Female tail short conoid (
6b – Female tail longer, elongate (
7a – Lip region slightly offset by depression; female rectum longer, 3 times anal body diam.
7b – Lip region not offset; female rectum shorter, 2 times anal body diam. 8
8a – Males as frequent as females; spicules longer, 35 µm, exceeding the GP1
8b – Males very rare; spicules shorter, 22 to 30 µm, not reaching the GP1
9a – Lip region visibly narrower than adjacent part of body; spicules longer, more than 40 µm 10
9b – Lip region equal or wider than adjacent part of body; spicules shorter, less than 30 µm (unknown in
10a – Male body more than 1mm long; spicules longer, 41 to 48 µm
10b – Male body less than 1 mm long; spicules shorter, 50 to 52 µm
11a – Gymnostom anteriorly narrower, with convex walls 12
11b – Gymnostom with parallel walls 14
12a – Lip region offset by constriction; metacorpus slightly swollen
12b – Lip region not offset or slightly offset by depression; metacorpus not swollen 13
13a – Lip region slightly offset by depression; gymnostom as long as promesostegostom; pharynx with metacorpus with sclerotized walls, valves-like; spermatheca differentiated in a sac
13b – Lip region not offset; gymnostom slightly shorter than promesostegostom; pharynx with metacorpus without sclerotized walls; spermatheca not differentiated in a sac
14a – Lip region slightly offset; female rectum ca. two times longer than ABW; GP1 very anterior, outside of the range of the spicules
14b – Lip region not offset; female rectum ca. three times longer than ABW; GP1 at spicules level 15
15a – Body length slightly larger (584-801 µm long); neck slightly shorter relative to the body length (
15b – Body length slightly smaller (505-691 µm long); neck slightly longer relative to the body length (
16a – Female rectum ca. as long or slightly longer than anal body width 17
16b – Female rectum longer than body width 22
17a – GP1 very reduced 18
17b – All GPs with similar size 20
18a – Spicules distally straight
18b – Spicules distally slightly hook-like 19
19a – Female body less than 1.7 mm long
19b – Female body more than 1.8 mm long
20a – Female stoma 21 to 28 µm long
20b – Female stoma 12 to 20 µm long 21
21a – Female body 0.9 to 1.3 mm long; female tail more slender (
21b – Female body 1.3 to 1.8 mm long; female tail shorter (
22a – Stomatal tube shorter, ca. 1.0 to 2.0 times longer than wide 23
22b – Stomatal tube longer, ca. 2.5 to 3.0 times longer than wide 30
23a – Cheilostom as long as stomatal tube length
23b – Cheilostom one third of the stomatal tube length 24
24a – GP1 very separated from GP2, and GP2-3 very close
24b – GP1-2 distance similar or slightly more than GP2-3 distance 25
25a – Spicules with ventral bent tip 26
25b – Spicules with thin tip, crochet needle-like 28
26a – Spicules 43 to 52 µm, with thin tip; GP1-2 distance similar to GP2-3 distance
26b – Spicules 50 to 62 µm, with thick tip; GP1-2 distance slightly more than GP2-3 distance 27
27a – Male tail shorter (20-32 µm long)
27b – Male tail longer (38-45 µm long)
28a – Female rectum ca. 1.5 times longer than ABW; spicules shorter, 34 to 44 µm long
28b – Female rectum ca. 2.0 to 2.5 times longer than ABW; spicules longer, 45 to 70 µm long 29
29a – Spicules shorter (45-51 µm long)
29b – Spicules longer (57-70 µm long)
30a – Spicules ventrad curved, as long as anal body width
30b – Spicules almost straight, longer than anal body width 31
31a – Spicules ca. 1.5 times longer than the gubernaculum
31b – Spicules ca. 2–3 times longer than the gubernaculum 32
32a – Spicules with manubrium longer than wide 33
32b – Spicules with manubrium as long as wide 35
33a – Lip region higher, twice wider than high
33b – Lip region lower, three times wider than high 34
34a – Stoma shorter, 9 to 10 µm; female tail shorter, (
34b – Stoma longer, 13 to 18 µm; female tail longer, (
35a – Female rectum ca. 3.0 to 4.5 times longer than anal body width
35b – Female rectum ca. 1.5 to 2.0 times longer than anal body width 36
36a – Female tail shorter,
36b – Female tail longer,
37a – Male tail with mucro shorter than gubernaculum; spicules with conoid manubrium
37b – Male tail with mucro longer than gubernaculum; spicules with rounded manubrium