| Characters | M. dalatensis sp. nov. | M. amplectens 1 | M. honbaensis 1 | M. catbaensis 2 | M. dorsobitheca 3 | M. scitula 4 |
|---|---|---|---|---|---|---|
| Source. 1: Michaelsen (1934); 2: Thai et al. (1992); 3: Thai and Le (1993); 4: Gates (1936). | ||||||
| Length (mm) | 95–125 | 44–52 | 62 | 120 | 54 | 100 |
| Diameter (mm) | 5.3–5.8 | 2–3 | 3–3.5 | 4–4.5 | 2 | 5 |
| Segments | 101–110 | 90–112 | 150 | 105 | 76 | ? |
| Spermathecal pores position | Ventrolateral | Dorsal | Ventrolateral | Ventrolateral | Mid dorsal line | Lateral line |
| First dorsal pore | 10/11 | 12/13 | ? | ‘12/13 | 10/11 | 12/13 |
| Pre-clitallar setae | 54–64/viii | 46/ix | 47/ix | 52/viii | 45/viii | 37–44/viii |
| Post-clitallar setae | 48–54/xxx | 50/xxv | 58/xix | 70/xxv | 44/xxv | 44–46/xx |
| Ventral setae between male pore | 12–14 | ? | ? | 2 | 8 | 12–14 |
| Ventral setae number between spermathecal pores | 17/vii, 18/viii | ? | ? | 22/viii | ? | 18–25/vii, 19–25/viii |
| Ventral distance between spermathecal pores | 0.30x | 0.43x | 0.33x | ? | ? | 0.5x |
| Ventral distance between male pores | 0.33x | ? | 0.37x | ? | ? | ? |
| Male markings | Absent | ? | ? | Absent | Absent | Absent |
| Intestinal swelling | xv | ? | ? | xv | xvi | xvi |
| Ampulla | Ovoid | Pear shape | Egg- to spherical-shape | Cordate | Sac | Small |
| Diverticulum | Straight | Sinusoidal-shaped | Curve | Twisted | Sinusoidal-shaped | Twisted |
| Shape of the seminal chamber | Sinusoidal-shaped, terminal end bean shaped | Cylindrical-shaped | Bean or egg shaped | ? | Sightly swollen | Spherical, ovoid, or elipsoidal |
| Protatic duct | Question mark shape | Folds | Crooked | Elongate, S-shaped | Elongate | a-, u- or cshaped |
| Copulatory pouch status | Highly elevated | Highly elevated | Limit inside body wall | Highly elevated | Highly elevated | Highly elevated |