Published January 12, 2026
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TABLE 2 in Two new earthworm species of the genus Metaphire Sims & Easton, 1972 (Annelida: Oligochaeta: Megascolecidae) from Highlands of Vietnam
Authors/Creators
- 1. Institute of Food and Biotechnology, Can Tho University, Can Tho, Vietnam. & Hau Giang Community College, Vi Thanh, Hau Giang, Vietnam.
- 2. School of Education, Can Tho University, Can Tho, Vietnam.
- 3. College of Natural Science, Can Tho University, Can Tho, Vietnam.
- 4. Faculty of Environmental Science, University of Science, Vietnam National University, Hanoi, Vietnam.
- 5. Institute of Biology, Vietnam Academy of Science and Technology, 18, Hoang Quoc Viet Rd., Cau Giay, Hanoi, Vietnam. & Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18, Hoang Quoc Viet Rd., Cau Giay, Hanoi, Vietnam.
Description
TABLE 2. Comparison of the morphological of M. dalatensis sp. nov. and its congeners in the houlleti species-group.
| Characters | M. dalatensis sp. nov. | M. amplectens 1 | M. honbaensis 1 | M. catbaensis 2 | M. dorsobitheca 3 | M. scitula 4 |
|---|---|---|---|---|---|---|
| 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 |
Source. 1: Michaelsen (1934); 2: Thai et al. (1992); 3: Thai and Le (1993); 4: Gates (1936).
Notes
Published as part of Phan, Quoc T., Lam, Dang H., Tran, Men T., Pham, Quang V. & Nguyen, Anh D., 2026, Two new earthworm species of the genus Metaphire Sims & Easton, 1972 (Annelida: Oligochaeta: Megascolecidae) from Highlands of Vietnam, pp. 107 in Zootaxa 5748 (1) on page 107, DOI: 10.11646/zootaxa.5748.1.5, http://zenodo.org/record/19167543
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Additional details
Identifiers
References
- Michaelsen, W. (1934) Oligochaten von Franzosisch - Indochina. Archives de Zoologie Experimentale et Generale, 76, 493 - 456. [in German]
- Thai, B. T., Do, N. V. & Huynh, H. T. K. (1992) New species of earthworms of genus Pheretima Kinberg, 1867 (Megascolecidae, Oligochaeta) belonging the bank of streams Xuan Nha Moc Chau (Son La Province) and Dac No, Dac Ken (Dac Lac Province). Tap chi Sinh hoc, 14 (4), 1-3. [in Vietnamese]
- Thai, B. T. & Le, T. V. (1993) Two new earthworms of the genus Pheretima Kinberg, 1867 (Megascolecidae - Oligochaeta) from Cat Ba National Park (Cat Ba Island, Hai Phong). Tap chi Sinh hoc, 15 (4), 33-35. [in Vietnamese]
- Gates, G. E. (1936) The earthworms of Burma. V. Records of the Indian Museum, 38, 377-468. https://doi.org/10.26515/rzsi/v38/i4/1936/162306