Table 3. Comparison of species Microlaimus paraundulatus sp. n. with morphologically similar species (only males).
| M. copulatus | M. limnophilus | M. porus | M. zosterae * | M. paraundulatus | |
|---|---|---|---|---|---|
| Body length | 320–330 | 401–470 | 380 | 618–621 | 439–457.5 |
| a | 18–20 | 22.8–29.3 | 21.1 | 27–29.4 | 27–30.5 |
| b | 4.1–4.6 | 5.6–6.5 | 4.9 | 6.7–7.2 | 5–6 |
| c | 6–7.2 | 7–8.8 | 5.4 | 9.4–9.9 | 8 |
| c′ | 3.2 | 3.2–4.1 | 5.1 | 3.6–3.9 | 4–5 |
| Cephalic setae in relation to head diameter (%) | 17% | 23–25% | 38% | 20% | 43% |
| amph% | 40% | 33–35% | <50%** | 43–45% | 44% |
| Amph/hd | 1.8 | 1.9 | 1.6 | 1.9 | 1.6 |
| Length of spicule along arc in relation to cloacal body diameter | 2.7–2.8 | 1.3 | 1.7 | 1.6 | 1.8–2.3 |
| Length of gubernaculum in relation to length of spicule along arc (%) | 30% | 47% | 42% | 60% | 48–56% |
| Precloacal supplements | + | + | − | + | − |
| Cuticular pores | − | − | + | − | − |
Notes:
Information (measurements/proportions) of males of the species Microlaimus that concomitantly have cephalic setae <50% of head diameter; amphidial fovea between 1.6 and 1.9 times the head diameter; amphidial fovea <50% of the head body diameter.
The measurements are expressed in micrometers, or if noted, as a percentage or ratio. Present (+) or absent (−); a, b, c, c′ = de Man’s (1880) ratios; distance of amphidial fovea from anterior end in relation to head diameter (Amph/hd); percentage of the amphidial fovea diameter in relation to corresponding body diameter (amph%).
Based on the redescription of the species Microlaimus zosterae Allgén, 1930 provided by Kovalyev & Tchesunov (2005).
Proportion measured from the drawing of the female paratype. Missing information for the holotype male.