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Description and Molecular Characterization of a New Dorylaimid Nematode, Mesodorylaimus pini n. sp. (Nematoda: Dorylaimidae) from Korea

Abraham Okki Mwamula

Abraham Okki Mwamula

Research Institute of Invertebrate Vector, Kyungpook National UniversitySangju, Republic of Korea
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Mwamula, Abraham Okki
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Sang Myeong Lee

Sang Myeong Lee

Jinju, Republic of Korea
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Lee, Sang Myeong
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Young Hak Jung

Young Hak Jung

Jinju, Republic of Korea
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Jung, Young Hak
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Yi Seul Kim

Yi Seul Kim

Research Institute of Invertebrate Vector, Kyungpook National UniversitySangju, Republic of Korea
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Kim, Yi Seul
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Dong Woon Lee

Dong Woon Lee

  • Research Institute of Invertebrate Vector, Kyungpook National UniversitySangju, Republic of Korea
  • Department of Entomology, Kyungpook National UniversitySangju, Republic of Korea
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Lee, Dong Woon
  
30 set 2024
Description and Molecular Characterization of a New Dorylaimid Nematode, Mesodorylaimus pini n. sp. (Nematoda: Dorylaimidae) from Korea's Cover Image
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Categoria dell'articolo: Research Paper
Pubblicato online: 30 set 2024
Ricevuto: 30 mar 2024
DOI: https://doi.org/10.2478/jofnem-2024-0028
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© 2024 Abraham Okki Mwamula et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1.

Illustrations of Mesodorylaimus pini n. sp. (A-L): A: Female whole body; B: Male whole body; C: Female anterior region; D: Female rectum and prerectum region; E: The expanded part of pharynx; F: Junction between intestine and prerectum with a long conical or tongue-like structure; G: Posterior end of male, including copulatory apparatus and the arrangement of ventromedian supplements; H, I: Vulval region, with variation in shape of sclerotizations; J: Female tail region; K: Female reproductive system; L: Sperm cells in testis and uterus.
Illustrations of Mesodorylaimus pini n. sp. (A-L): A: Female whole body; B: Male whole body; C: Female anterior region; D: Female rectum and prerectum region; E: The expanded part of pharynx; F: Junction between intestine and prerectum with a long conical or tongue-like structure; G: Posterior end of male, including copulatory apparatus and the arrangement of ventromedian supplements; H, I: Vulval region, with variation in shape of sclerotizations; J: Female tail region; K: Female reproductive system; L: Sperm cells in testis and uterus.

Figure 2.

Photomicrographs of Mesodorylaimus pini n. sp. (A-J). A, B: Variation in female anterior region; C: Junction between intestine and prerectum with a long conical or tongue-like structure; D, E, F: Variation in female tail region; G: Male tail region; H: Male posterior region with ventromedian supplements and copulatory apparatus; I, J: Vulval region and variation in shape of sclerotizations (Scale bars: A, B, C, E, F, G, I and J = 10 μm; D and H = 20 μm).
Photomicrographs of Mesodorylaimus pini n. sp. (A-J). A, B: Variation in female anterior region; C: Junction between intestine and prerectum with a long conical or tongue-like structure; D, E, F: Variation in female tail region; G: Male tail region; H: Male posterior region with ventromedian supplements and copulatory apparatus; I, J: Vulval region and variation in shape of sclerotizations (Scale bars: A, B, C, E, F, G, I and J = 10 μm; D and H = 20 μm).

Figure 3.

Bayesian tree inferred under the GTR + I + G model from 18S-rRNA gene sequences of Dorylaimid species. Posterior probability values exceeding 50% are given on appropriate clades. The studied population is indicated in bold text. Outgroup taxa: Paravulvus hartingii and Nygolaimus cf. parvus.
Bayesian tree inferred under the GTR + I + G model from 18S-rRNA gene sequences of Dorylaimid species. Posterior probability values exceeding 50% are given on appropriate clades. The studied population is indicated in bold text. Outgroup taxa: Paravulvus hartingii and Nygolaimus cf. parvus.

Figure 4.

Bayesian tree inferred under the GTR + I + G model from LSU D2–D3 partial sequences of Dorylaimid species. Posterior probability values exceeding 50% are given on appropriate clades. The studied population is indicated in bold text. Outgroup taxa: Mononchus tunbridgensis and Anatonchus tridentatus.
Bayesian tree inferred under the GTR + I + G model from LSU D2–D3 partial sequences of Dorylaimid species. Posterior probability values exceeding 50% are given on appropriate clades. The studied population is indicated in bold text. Outgroup taxa: Mononchus tunbridgensis and Anatonchus tridentatus.

Morphometrics of Mesodorylaimus pini n_ sp_ from Korea

Characteristic Holotype ♀ ♀♀ ♂♂
n 31 32
L 1802 1702.6 ±101.5 (1503–1889) 1558.2 ± 103.0 (1366–1775)
a 44.5 43.0 ± 2.2 (37.7–47.0) 40.6 ± 2.2 (35.3–44.9)
b 4.8 4.6 ± 0.3 (4.0–5.1) 4.3 ± 0.2 (3.6–4.8)
c 10.6 11.9 ± 1.0 (10.0–13.6) 73.1 ± 8.1 (56.3–87.5)
c’ 6.5 5.8 ± 0.6 (4.9–7.0) 0.8 ± 0.1 (0.6–0.8)
V 50.5 51.4 ± 1.2 (50.0–54.9) _
G1% 17.4 17.8 ± 1.7 (14.3–19.6) _
G2% 17.8 18.6 ± 1.8 (14.6–20.7) _
Lip height 5.0 5.0 ± 0.4 (4.5–6.0) 5.2 ± 0.5 (4.5–6.0)
Lip diam. 12.5 12.2 ± 0.5 (11.0–13.5) 12.3 ± 0.5 (11.0–13.0)
Anterior to guiding ring 9.0 9.2 ± 0.3 (8.5–9.5) 9.2 ± 0.2 (9.0–9.5)
Odontostyle 18.0 18.2 ± 1.0 (17.0–19.0) 18.1 ± 0.9 (17.0–19.0)
Odontophore 21.5 22.0 ± 1.2 (19.0–24.0) 21.7 ± 1.5 (19.0–23.5)
Total spear 39.5 40.2 ±1.7 (36.0–42.5) 39.9 ±1.9 (36.0–42.0)
Anterior to nerve ring 127.0 126.5 ± 5.2 (119.0–143.0) 124.4 ± 2.7 (118.0–132.0)
Pharynx length 377 369.2 ± 16.7 (333–398) 358.7 ± 16.7 (326–390)
Expanded part of pharynx 160 161.3 ± 9.6 (142.0–186.0) 151.2 ± 11.1 (133.0–179.5)
Cardia length 21.0 20.1 ± 3.6 (14.5–27.5) 20.8 ± 3.3 (14.0–25.5)
Maximum body diam. 40.5 39.7 ± 2.2 (32.0–43.5) 38.4 ± 2.1 (33.0–42.0)
Vulva to anus 739 729.2 ± 35.3 (647–817) _
Prerectum 78.5 80.8 ± 6.5 (69.0–99.0) 119.2 ± 9.1 (110.5–151.5)
Rectum 31.5 32.0 ± 2.6 (28.0–38.0) 44.0 ± 4.0 (35.0–49.5)
Anal / cloacal body diam. 26.0 24.7±1.3 (22.0–26.5) 28.5 ± 1.6 (25.0–32.0)
Tail length 179.0 144.4 ± 18.4 (115.0–187.0) 21.5 ± 1.8 (18.0–25.0)
Spicules _ _ 52.3 ± 1.8 (48.0–57.0)
No. of ventromedian supplements _ _ 7–8
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