| 1 | Sexual dimorphism | present (0), absent (1) |
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| 2 | Lip region | offset (0), not offset (1) |
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| 3 | Stoma | wide [2–4 times longer] (0), narrow [5–7 times longer] (1) |
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| 4 | Glottoid apparatus | distinguishable (0), indistinguishable (1) |
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| 5 | Tail length | long [above 50 μm] (0), moderate [31–50 μm] (1), small [10–30 μm] (2) |
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| 6 | Tail shape | cupola-shaped (0), hemispheroid (1), conoid (2) |
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| 7 | Spike length | small [11–30 μm] (0), absent (1), minute [2–10 μm] (2), moderate [31–50 μm] (3), long [above 50 μm] (4) |
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| 8 | Spicule length | up to 50 μm (0), more than 50 μm (1) |
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| 9 | Spicules distally fused | more than 20% (0), less than 20% (1) |
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| 10 | Gubernaculum length vs spicule length | ≤ ½ of spicule length (0),> ½ or equal to spicule length (1) |
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| 11 | Bursa | closed (0), open (1) |
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| 12 | Punctations on bursa | present (0), absent (1) |
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| 13 | Position of anterior bursal velum | close to cloaca (0), distant from cloaca (1) |
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| 14 | Bases of genital papillae | normal (0), swollen (1) |
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| 15 | No. of precloacal GP | two pairs (0), three pairs (1), absent (2), single pair (3) |
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| 16 | Position of GP1 | inside the bursa (0), outside the bursa (1) |
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| 17 | Position of GP3 | close to GP4 (0), distant from GP4 (1) |
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| 18 | GP3 | slender (0), plump (1) |
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| 19 | GP5 | plump, long (0), slender, long (1) |
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| 20 | Group of GP6–8 | basally fused (0), not fused (1) |
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| 21 | Dauer cuticle | not-sculptured (0), sculptured (1) |
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| 22 | Dauer forms cyst | no (0), yes (1) |
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