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A new actinolaim, Egtitus invaginatus n. sp. (Nematoda: Actinolaimidae) from South Korea Cover

A new actinolaim, Egtitus invaginatus n. sp. (Nematoda: Actinolaimidae) from South Korea

Open Access
|May 2026

Figures & Tables

Figure 1

Line drawings of Egtitus invaginatus n. sp. (a) Female whole body; (b) anterior end, surface view with amphid; (c) female posterior region; (d) partial female reproductive system (vulval region and uterus); (e): female anterior region; (f) head region; (g) male posterior region; (h) pharynx–intestine junction; (i) male whole body; (j and k) female anal region with variation in invaginations.

Figure 2

Light micrographs of Egtitus invaginatus n. sp. (a) Female anterior region; (b and g) female anal region with variation in invaginations; (c and d) female tail region; (e and f) anterior pharyngeal region (arrows indicate the position of body pores); (h and i) vulval region in lateral view; (j) vulval region in ventral view (arrow indicates the transverse vulva); (k) male posterior region with copulatory apparatus (Scale bars: a, c, and d = 50 μm; b and e–k = 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 newly obtained sequences are indicated in bold text.

Figure 4

Bayesian tree inferred under the GTR + I + G model from 28S-rRNA gene partial sequences of Dorylaimid species. Posterior probability values exceeding 50% are given on appropriate clades. The newly obtained sequences are indicated in bold text.

Morphometrics of Egtitus invaginatus n_ sp_ from Korea

CharacterHolotype ♀♀♀♂♂
n 191
L 1,8581,880 ± 109.7 (1,671–2,124)1,485
a 44.842.8 ± 3.4 (36.6–48.4)42.9
b 4.04.3 ± 0.3 (3.8–5.0)3.6
c 13.514.8 ± 1.2 (12.5–17.5)54.0
c5.85.3 ± 0.5 (4.7–6.9)1.2
V 52.251.9 ± 0.8 (50.1–53.4)
G 1 17.015.1 ± 1.6 (12.0–17.6)
G 2 16.715.2 ± 1.5 (12.1–17.5)
Lip height8.59.1 ± 0.6 (8.5–10.0)9.5
Lip diam.21.521.0 ± 0.7 (19.5–22.0)20.0
Anterior to guiding ring15.515.9 ± 0.3 (15.5–16.5)15.5
Odontostyle20.020.2 ± 0.6 (19.0–21.0)19.5
Odontophore21.019.9 ± 1.8 (16.5–22.0)19.0
Total spear41.040.1 ± 1.8 (36.5–43.0)38.5
Anterior to nerve ring135138.4 ± 8.3 (123–158)126
Pharynx length469442.7 ± 18.4 (410–476)414
Glandularium length227215.1 ± 11.7 (198–231)203
Cardia length21.016.5 ± 3.7 (9.0–24.5)15.0
Maximum body diam.41.544.1 ± 3.9 (37.0–49.0)34.5
Prerectum 61.052.1 ± 14.0 (31.5–70.0)98.0
Rectum 36.534.7 ± 3.1 (26.0–39.0)44.0
ABD or CBD24.023.9 ± 1.4 (22.0–27.0)26.0
Tail length138.0127.4 ± 10.4 (114.5–151.0)27.5
Spicules46.5
No. of ventromedian supplements7
DOI: https://doi.org/10.2478/jofnem-2026-0012 | Journal eISSN: 2640-396X | Journal ISSN: 0022-300X
Language: English
Page range: 137 - 149
Submitted on: Jan 13, 2026
Accepted on: Mar 13, 2026
Published on: May 6, 2026
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

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