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               Deladenus coreanus n. sp. (Rhabditida: Neotylenchidae), a new species from South Korea Cover

Deladenus coreanus n. sp. (Rhabditida: Neotylenchidae), a new species from South Korea

Open Access
|Apr 2026

Figures & Tables

Figure 1

Line drawings of Deladenus coreanus n. sp. (a–j): (a) female entire body; (b) male entire body; (c) part of female genital branch; (d) female pharyngeal region; (e) anterior body region; (f and g) variation in female tail and vulvar region; (h) tail end; (i) male tail; and (j) lateral field.

Figure 2

Light micrographs of Deladenus coreanus n. sp. (a–e). (a and b) female pharyngeal region (arrowheads showing hemizonid, he); (c) male pharyngeal region; (d) female posterior region; (e) female genital branch (scale bars: a–e = 50 μm).

Figure 3

Light micrographs of Deladenus coreanus n. sp. (a–g). (a) male pharyngeal region (arrowheads showing hemizonid, he); (b) female pharyngeal region (arrowheads showing hemizonid, he); (c) lip region; (d) lateral field; (e and f) variation in female tail; (g) male tail (scale bars: a and b, e–g = 20 μm; c and d = 10 μm).

Figure 4

Bayesian tree inferred using 18S rRNA gene sequences of Deladenus spp. and other related species from various genera under the GTR + I + G model. Posterior probability values exceeding 50% are given on appropriate clades. The studied population is indicated in bold text.

Figure 5

Bayesian tree inferred using LSU D2-D3 partial gene sequences of Deladenus spp. and other related species from various genera under the GTR + I + G model. Posterior probability values exceeding 50% are given on appropriate clades. The studied population is indicated in bold text.

Figure 6

Bayesian tree inferred using COI gene sequences of Deladenus spp. and other related species from various genera under the GTR + I + G model. Posterior probability values exceeding 50% are given on appropriate clades. The studied population is indicated in bold text.

Morphometrics of the mycetophagous population of Deladenus coreanus n_ sp_ from Korea

CharacterHolotype ♀♀♀♂♂
n 145
L 1,002968 ± 106.3 (852–1,225)808 ± 63.2 (758–885)
a 40.439.7 ± 4.8 (30.6–48.2)40.6 ± 5.6 (36.4–48.3)
b 12.812.2 ± 1.2 (10.7–14.2)11.2 ± 0.5 (10.5–11.8)
b6.06.0 ± 0.6 (5.1–7.2)5.4 ± 0.8 (4.6–6.3)
c 33.232.7 ± 2.8 (28.8–39.7)27.5 ± 2.5 (25.0–31.1)
c2.52.6 ± 0.4 (1.8–3.5)2.6 ± 0.3 (2.2–3.1)
V 93.793.8 ± 0.5 (93.0–94.9)
G 1 or T 53.762.0 ± 6.6 (52.0–75.8)53.9 ± 7.1 (41.9–60.5)
Lip diam.6.06.0 ± 0.5 (5.0–7.0)5.6 ± 0.1 (5.5–6.0)
Stylet length9.59.2 ± 0.5 (8.0–10.0)8.7 ± 0.4 (8.5–9.5)
Anterior to nerve ring7273.1 ± 2.4 (71–79)66.2 ± 3.2 (63–71)
Pharyngo-intestinal junction7879.1 ± 2.9 (75–87)72.4 ± 3.1 (69–76)
Anterior to Hemizonid108101.4 ± 8.5 (86–116)90.1 ± 1.7 (87–91)
Glandular overlap8982.0 ± 7.5 (64–89)78.5 ± 12.1 (65–92)
Anterior end to end of glandular overlap167161.1 ± 7.6 (143–172)150.9 ± 9.9 (140–164)
Maximum body diam.25.024.9 ± 4.9 (18.0–35.0)20.0 ± 1.2 (18.0–21.0)
Vulval body diam.20.519.0 ± 3.1 (14.0–25.0)
Vulva-to-anus distance (VA)31.028.5 ± 3.1 (22.5–34.0)
Anal or cloacal body diam.12.011.7 ± 2.3 (8.0–17.0)11.3 ± 0.9 (10.0–12.5)
Tail length30.029.7 ± 3.3 (23.5–34.0)29.4 ± 1.5 (28.0–31.0)
Ratio of VA to tail length1.01.0 ± 0.1 (0.8–1.1)
Spicules20.1 ± 0.9 (19.0–21.0)
Gubernaculum6.7 ± 0.2 (6.5–7.0)
DOI: https://doi.org/10.2478/jofnem-2026-0005 | Journal eISSN: 2640-396X | Journal ISSN: 0022-300X
Language: English
Page range: 18 - 30
Submitted on: Nov 20, 2025
Accepted on: Feb 19, 2026
Published on: Apr 20, 2026
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2026 Abraham Okki Mwamula, Chang-hwan Bae, Dae Geun Lee, Yi Seul Kim, Myeonghwan Kim, Dong Woon Lee, published by Society of Nematologists, Inc.
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.