Published January 12, 2026
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TABLE 1 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 1. Comparison of the morphology of M. mangcanhensis sp. nov. and its congeners found in Vietnam.
| Characters | M. mangcanhensis sp. nov. | M. baii 1 | M. birmanica 2 | M. chaubinhensis 3 | M. hilgendorfi 4 |
|---|---|---|---|---|---|
| Ventral distance between spermathecal pores | 0.35X | 0.40X | ? | ? | ? |
| Ventral setae number between spermathecal pores | 18–20/vi, 18–21/vii | ? | ? | 9/v 18/viii | ? |
| Shape of the seminal chamber | Elongated, terminal end slightly swollen | Twisted, terminal end slightly swollen | Ovoid | Baseball bat shape* | ? |
| Length (mm) | 70–126 | 80–115 | 92–98 | 120 | 150 |
| Diameter (mm) | 5.4–5.6 | 3.77–4.27 | 4.4–4.6 | 5–6 | 6 |
| Segments | 101–134 | 94–111 | 141–168 | 77 | 120 |
| Clitellum | xiv–xvi | xiv–xvi | xiv–xvi | 1/3xiv–2/3xvi | xiv–xvi |
| First dorsal pore | 12/13 | 12/13 | 11/12 | 12/13 | 12/13 |
| Pre–clitellar setae | 48–56/viii | 54–60/viii | 109–117/viii | 42/viii | ? |
| Pre–clitellar setae | 55–62/xxx | 69–71/xxx | 89–94/xxx | 70/xxv | ? |
| Ventral setae number between male pores | 14–16 | 13–17 | 9–11 | 18 | ? |
| Spermathecal markings | 2 groups in vii | Absent | Absent | Numerous next to spermathecal pore | ? |
| Male markings | Absent | Absent | Absent | ? | 1 pair |
| Ampulla | Ovoid or cordate shaped | Oval | Oval | Cordate | ? |
| Diverticulum | Coiled | coiled | Strongly waved | Straight | ? |
| Caeca | Simple | Manicate | Manicate | Manicate | manicate |
| Testis sac | Connected | Connected 5 | Separated | Connected | ? |
| Accessory glands | Mushroom shaped, long stalk | Absent | Absent | Mushroom shaped, long stalk | ? |
| Typhlosole | Lamelliform | Lamelliform | Lamelliform | Poor develope | ? |
| Lymp gland | 29/30 | Absent | 16/17 | Absent | ? |
Source. 1: Nguyen (2011); 2: Lam et al. (2020); 3: Do et al. (1994); 4: Michaelsen (1892); 5: Nguyen et al. (2022a) re–described the type specimen.
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. 105 in Zootaxa 5748 (1) on page 105, DOI: 10.11646/zootaxa.5748.1.5, http://zenodo.org/record/19167543
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Additional details
Identifiers
References
- Nguyen, T. T. (2011) Descriptions of two new species of earthworm of the genus Pheretima Kinberg, 1867 (Oligochaeta: Megascolecidae) from Mekong Delta-Vietnam. Tap chi Sinh hoc, 33 (1), 24-29. [in Vietnamese] https://doi.org/10.15625/0866-7160/v33n1.730
- Lam, D. H., Nguyen, A. D. & Nguyen, T. T. (2020) The first record of Metaphire birmanica (Rosa, 1888) in Vietnam, with notes on several earthworm species. Jurnal Biodjati, 5 (1), 15-22. https://doi.org/10.15575/biodjati.v5i1.8111
- Do, N. V., Le, T. V. & Tran, K. M. (1994) New species of earthworm of genus Pheretima Kinberg, 1867 (Megascolecidae, Oligochaeta) from Lang Son and Nghe An provinces. T ap chi Sinh Hoc, 16 (1), 22-28. [in Vietnamese]
- Michaelsen, W. (1892) Terricolen der Berliner Zoologischen Sammlung, II. Archiv fur Naturgeschichte, 1 (3), 209-261. [in German] https://doi.org/10.5962/bhl.part.8321
- Nguyen, T. T., Thai, B. T., Nguyen, A. D. & Lam, D. H. (2022 a) Earthworms in the Mekong Delta - Vietnam. Can Tho University Publishing House, Can Tho, Vietnam, 233 pp.