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Description of Deladenus longicaudatus n. sp. (Sphaerularioidea: Neotylenchidae) from Mazandaran province, northern Iran: A morphological and molecular phylogenetic study Cover

Description of Deladenus longicaudatus n. sp. (Sphaerularioidea: Neotylenchidae) from Mazandaran province, northern Iran: A morphological and molecular phylogenetic study

Open Access
|May 2026

Figures & Tables

Figure 1

Line drawings of Deladenus longicaudatus n. sp. (mycetophagous female). (a) Total body. (b) Anterior body region. (c) Pharyngeal region. (d) Lateral lines. (e) Posterior body region.

Figure 2

Photomicrographs of Deladenus longicaudatus n. sp. (mycetophagous female). (a and b) Total body. (c) Cephalic region and stylet (fresh sample in water). (d) Position of nerve ring (upper arrowhead) and hemizonid (lower arrowhead). (e) Position of pharyngo-intestinal junction at the level with the nerve ring (arrowhead). (f) Lateral vulval flap (arrowhead). (g) Lateral lines. (h) Part of reproductive system. (i) Posterior body region. (Scale bars: a and b = 40 µm, c and g = 5 µm, d–f, h and i = 10 µm).

Figure 3

Bayesian 50% majority rule consensus tree of Deladenus spp. and other related species from various genera based on SSU rDNA sequences under GTR + I + G model. BPP values more than 0.50 are given for appropriate clades. The newly generated sequences are indicated in bold.

Figure 4

Bayesian 50% majority rule consensus tree of Deladenus spp. and other related species from various genera based on LSU rDNA D2–D3 sequences under GTR + I + G model. BPP values more than 0.50 are given for appropriate clades. The newly generated sequences are indicated in bold.

Morphometrics of Deladenus longicaudatus n_ sp_

Female
Characters HolotypeParatypes
n111
L570579 ± 51
(523–682)
a2627 ± 5
(19.5–34.0)
b9.89.3 ± 1.0
(8–11)
b′4.55 ± 1
(3.8–6.7)
c9.810.1 ± 0.5
(9.3–11.0)
c′4.64.7 ± 0.4
(3.9–5.3)
V85.086.3 ± 1.2
(84.5–89.0)
Lip region height22.0 ± 0.3
(1.8–2.5)
Lip region width66.0 ± 0.2
(5.8–6.2)
Stylet6.56.0 ± 0.5
(5.0–6.5)
Conus2.52.3 ± 0.2
(2.0–2.5)
m3837.0 ± 3.1
(31.5 ± 40.5)
Nerve ring5761 ± 5
(51–67)
Hemizonid8997 ± 10
(84–110)
S–E pore9199 ± 10
(86–112)
Pharynx5862 ± 5
(51–69)
Anterior end to end of glands126121 ± 16
(102–142)
Overlapping6859 ± 13
(39–76)
Anterior end to vulva485500 ± 50
(442–607)
Maximum body diameter2222 ± 4
(16–27)
Vulval body width1917.5 ± 2.0
(14.5–20.5)
Anal body width12.512.0 ± 1.5
(8.5–13.5)
Vulva-anus2725 ± 3
(21–31)
Tail5856.5 ± 4.0
(51–63)
DOI: https://doi.org/10.2478/jofnem-2026-0002 | Journal eISSN: 2640-396X | Journal ISSN: 0022-300X
Language: English
Page range: 126 - 136
Submitted on: Sep 25, 2025
Accepted on: Jan 14, 2026
Published on: May 7, 2026
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2026 Mehdi Salemi, Farahnaz Jahanshahi Afshar, Mohammad Reza Atighi, Majid Pedram, published by Society of Nematologists, Inc.
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.