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Description and Molecular Characterization of Criconemoides iraqicus n. sp. (Rhabditida: Criconematidae) From Iraq Cover

Description and Molecular Characterization of Criconemoides iraqicus n. sp. (Rhabditida: Criconematidae) From Iraq

Open Access
|Oct 2025

Figures & Tables

Figure 1:

Line drawings of Criconemoides iraqicus n. sp. from Iraq. Female. (A) Entire body; (B) Anterior body region; (C) Cuticular annuli showing anastomosis; (D,E) Posterior body region.
Line drawings of Criconemoides iraqicus n. sp. from Iraq. Female. (A) Entire body; (B) Anterior body region; (C) Cuticular annuli showing anastomosis; (D,E) Posterior body region.

Figure 2:

Light photomicrographs of Criconemoides iraqicus n. sp. from Iraq. Female. (A) Entire body; (B) Anterior body region; (C) En face view; (D,E) Cuticular annuli showing anastomosis; (F) Pharyngeal region (the arrow indicates the excretory pore); (G–I) Posterior body region. Arrowheads showing position of vulva (v) and anus (a). Scale bars: A = 50 μm; B–I = 10 μm.
Light photomicrographs of Criconemoides iraqicus n. sp. from Iraq. Female. (A) Entire body; (B) Anterior body region; (C) En face view; (D,E) Cuticular annuli showing anastomosis; (F) Pharyngeal region (the arrow indicates the excretory pore); (G–I) Posterior body region. Arrowheads showing position of vulva (v) and anus (a). Scale bars: A = 50 μm; B–I = 10 μm.

Figure 3:

Light photomicrographs of Criconemoides iraqicus n. sp. from Iraq. Juveniles. (A) Entire body; (B–D) Anterior body region; (E) Pharyngeal region; (F–H) Cuticular annuli showing anastomoses and ornamentation; (I) Posterior body region. Scale bars: A = 20 μm; B–I = 10 μm.
Light photomicrographs of Criconemoides iraqicus n. sp. from Iraq. Juveniles. (A) Entire body; (B–D) Anterior body region; (E) Pharyngeal region; (F–H) Cuticular annuli showing anastomoses and ornamentation; (I) Posterior body region. Scale bars: A = 20 μm; B–I = 10 μm.

Figure 4:

Bayesian 50% majority rule consensus tree inferred from analysis of the SSU rDNA sequence of Criconemoides iraqicus n. sp. under the GTR + G + I model. BPP values more than 0.50 are given for appropriate clades. New sequence is indicated in bold. BPP, Bayesian posterior probability.
Bayesian 50% majority rule consensus tree inferred from analysis of the SSU rDNA sequence of Criconemoides iraqicus n. sp. under the GTR + G + I model. BPP values more than 0.50 are given for appropriate clades. New sequence is indicated in bold. BPP, Bayesian posterior probability.

Figure 5:

Bayesian 50% majority rule consensus tree inferred from analysis of the D2–D3 domains of the LSU rDNA sequences of Criconemoides iraqicus n. sp. under the GTR + G + I model. BPP values more than 0.50 are given for appropriate clades. New sequences are indicated in bold. BPP, Bayesian posterior probability.
Bayesian 50% majority rule consensus tree inferred from analysis of the D2–D3 domains of the LSU rDNA sequences of Criconemoides iraqicus n. sp. under the GTR + G + I model. BPP values more than 0.50 are given for appropriate clades. New sequences are indicated in bold. BPP, Bayesian posterior probability.

Figure 6:

Bayesian 50% majority rule consensus tree inferred from analysis of the ITS rDNA sequence of Criconemoides iraqicus n. sp. under the GTR + G + I model. BPP values more than 0.50 are given for appropriate clades. New sequences are indicated in bold. BPP, Bayesian posterior probability.
Bayesian 50% majority rule consensus tree inferred from analysis of the ITS rDNA sequence of Criconemoides iraqicus n. sp. under the GTR + G + I model. BPP values more than 0.50 are given for appropriate clades. New sequences are indicated in bold. BPP, Bayesian posterior probability.

Morphometrics of Criconemoides iraqicus n_ sp_ from Misan province, Iraq_

CharacterHolotype FemaleParatypes

FemalesJuveniles
n156
L455474.2 ± 21.8 (443–496)292.3 ± 26.5 (278–321)
a10.310.3 ± 0.9 (9.4–11.6)13.1 ± 0.3 (12.4–13.6)
b3.53.8 ± 0.2 (3.5–4.2)3.5 ± 0.3 (3.3–4.1)
c25.329.3 ± 2.7 (24.9–33.3)23.4 ± 1.6 (21.3–25.2)
c′0.80.7 ± 0.1 (0.6–0.8)0.8 ± 0.2 (0.7–0.9)
o8.68.4 ± 0.3 (7.8–8.9)6.8 ± 0.2 (6.3–7.2)
DGO6.56.1 ± 0.4 (5.3–6.8)3.7 ± 0.4 (3.1–4.3)
V92.391.5 ± 0.3 (91.2–92.5)
Stylet length75.368.2 ± 3.6 (64.6–75.3)47.4 ± 0.5 (46.6–50.3)
m79.781.9 ± 2.4 (78.6–85.3)78.2 ± 2.6 (73.2–81.4)
Stylet Knob height4.54.6 ± 0.3 (4.2–5.3)3.7 ± 0.3 (2.8–4.1)
Stylet Knob width1210.8 ± 0.5 (10.2–12.2)8.9 ± 0.3 (7.8–10.2)
Anterior end to excretory pore134132.4 ± 2.8 (129–137)90.6 ± 1.2 (87–95)
Body width44.245.2 ± 2.2 (43.2–47.6)25.5 ± 1.6 (23.2–28.7)
Anal body width2322.3 ± 1.2 (20.5–23.8)14.1 ± 0.9 (12.8–15.4)
Vulval body width3230.7 ± 1.6 (27.7–33.8)
Lip region-vulva420442.3 ± 27.8 (396–470)
Vulva-tail terminus3034.8 ± 1.2 (29.4–38.9)
First lip annulus diam.11.511.4 ± 0.9 (10.0–12.9)10.4 ± 0.6 (9.6–11.8)
Second lip annulus diam.15.213.2 ± 1.1 (11.6–15.7)12.7 ± 1.2 (10.4–14.6)
First body annulus diam.1816.7 ± 1.2 (14.3–18.5)15.3 ± 1.3 (13.5–17.2)
Second body annulus diam.21.520.6 ± 2.3 (17.5–22.8)18.8 ± 1.5 (16.4–20.1)
Pharynx length128121.8 ± 4.1 (117–130)89.2 ± 3.2 (87–93)
Annulus width6.88.1 ± 0.3 (6.3–8.7)3.2 ± 0.1 (2.8–3.6)
Tail length1816.8 ± 1.5 (14.3–19.1)16.5 ± 1.2 (13.4–18.9)
R7977.8 ± 2.2 (76–79)82.7 ± 2.1 (77–84)
RSt1413.2 ± 0.8 (12–15)12.2 ± 0.8 (11–13)
ROes2119.5 ± 1.4 (20–24)23.5 ± 1.9 (20–25)
Rex2321.6 ± 1.3 (22–25)25.2 ± 2.1 (22–27)
RV78.4 ± 0.6 (7–9)
RVan32.5 ± 0.5 (2–3)
Ran43.6 ± 0.4 (3–4)3.9 ± 0.5 (3–5)
VL/VB0.91.0 ± 0.1 (0.9–1.3)
St%L16.516.1 ± 0.3 (14.2–17.2)15.7 ± 0.4 (15.4–16.6)
DOI: https://doi.org/10.2478/jofnem-2025-0046 | Journal eISSN: 2640-396X | Journal ISSN: 0022-300X
Language: English
Submitted on: Jun 9, 2025
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Published on: Oct 5, 2025
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2025 Ahmed Malik Jumaah, Sedighe Azimi, published by Society of Nematologists, Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.