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Description of Laimaphelenchus sinensis n. sp. (Nematoda: Aphelenchoididae) from declining Chinese pine, Pinus tabuliformis in Beijing, China

Jianfeng Gu
Jianfeng Gu
, 
Munawar Maria
Munawar Maria
, 
Yiwu Fang
Yiwu Fang
, 
Lele Liu
Lele Liu
, 
Yong Bian
Yong Bian
 oraz 
Xianfeng Chen
Xianfeng Chen
   | 17 mar 2020
Journal of Nematology's Cover Image
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Data publikacji: 17 mar 2020
Zakres stron: 1 - 9
Otrzymano: 08 wrz 2019
DOI: https://doi.org/10.21307/jofnem-2020-019
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© 2020 Jianfeng Gu et al., published by Sciendo.
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1:

Line drawings of Laimaphelenchus sinensis n. sp. A: Entire female; B: Entire male; C: Anterior region; D: Female posterior region showing vulva and post-uterine sac; E: Lateral lines F, G: Female tail terminus; H: Male tail; I: Spicule. (Scale bars = A, B = 20 μm; C-I = 10 μm).
Line drawings of Laimaphelenchus sinensis n. sp. A: Entire female; B: Entire male; C: Anterior region; D: Female posterior region showing vulva and post-uterine sac; E: Lateral lines F, G: Female tail terminus; H: Male tail; I: Spicule. (Scale bars = A, B = 20 μm; C-I = 10 μm).

Figure 2:

Light photomicrographs of Laimaphelenchus sinensis n. sp. A: Entire female; B: Entire male; C: Lateral lines; D: Anterior region; E: Female posterior region showing vulva and post-uterine sac; F, G: Vulval regions; H: Female tail; I-K: Female tail terminus; L-N: Male tails arrows showing position of caudal papillae (Scale bars = A, B = 20 μm; C-N = 10 μm; Abbreviations: ex, excretory pore).
Light photomicrographs of Laimaphelenchus sinensis n. sp. A: Entire female; B: Entire male; C: Lateral lines; D: Anterior region; E: Female posterior region showing vulva and post-uterine sac; F, G: Vulval regions; H: Female tail; I-K: Female tail terminus; L-N: Male tails arrows showing position of caudal papillae (Scale bars = A, B = 20 μm; C-N = 10 μm; Abbreviations: ex, excretory pore).

Figure 3:

Phylogenetic relationships of Laimaphelenchus sinensis n. sp. and aphelenchid nematodes based on full length of 18 S rDNA. The 100001st Bayesian tree inferred from 18 S rDNA under TVM + I + G model. Aphelenchus avenae (JQ348399) served as the outgroup species. Posterior probability values exceeding 50% are given on appropriate clades.
Phylogenetic relationships of Laimaphelenchus sinensis n. sp. and aphelenchid nematodes based on full length of 18 S rDNA. The 100001st Bayesian tree inferred from 18 S rDNA under TVM + I + G model. Aphelenchus avenae (JQ348399) served as the outgroup species. Posterior probability values exceeding 50% are given on appropriate clades.

Figure 4:

Phylogenetic relationships of Laimaphelenchus sinensis n. sp. and aphelenchid nematodes based on D2-D3 expansion segments of 28 S rDNA. The 100001st Bayesian tree inferred from 28 S rDNA under TIM2 + I + G model. Aphelenchus avenae (JQ348400) served as the outgroup species. Posterior probability values exceeding 50% are given on appropriate clades.
Phylogenetic relationships of Laimaphelenchus sinensis n. sp. and aphelenchid nematodes based on D2-D3 expansion segments of 28 S rDNA. The 100001st Bayesian tree inferred from 28 S rDNA under TIM2 + I + G model. Aphelenchus avenae (JQ348400) served as the outgroup species. Posterior probability values exceeding 50% are given on appropriate clades.

Morphometrics data for Laimaphelenchus sinensis n. sp.

Female Male
Character Holotype Paratypes Paratypes
n – 6 5
L 914 968±46.1 (914-1064) 876±69.1 (750-956)
a 42.1 41.5±1.9 (38.6-44.8) 46.2±2.6 (42.4-50)
b 11.2 11.7±0.6 (11.2-12.7) 10.5±0.6 (9.4-11.1)
b’ 4.3 4.8±0.4 (4.3-5.6) 4.6±0.3 (4.1-4.9)
c 25.3 28±3.1 (25-32.9) 19.9±1.4 (17.9-22.3)
c’ 2.6 2.6±0.3 (2.1-2.9) 2.7±0.2 (2.4-2.9)
V or T 70.5 69.1±0.9 (67.7-70.7) 70.8±4.4 (63.4-76.5)
Lip region height 2.3 2.4±0.1 (2.2-2.6) 2.7±0.1 (2.6-2.8)
Lip region width 6.9 7.1±0.3 (6.8-7.4) 7.1±0.6 (6.4-7.9)
Stylet length 12.2 12.3±0.3 (11.8-12.6) 12.3±0.6 (11.1-12.9)
Body diam. 21.7 23.4±1.7 (21.6-26.4) 19±1.1 (17.7-20.9)
Median bulb width 18.9 13.2±0.7 (12.4-14) 12±0.7 (11-12.8)
Median bulb length 12.6 18.5±0.5 (17.6-18.9) 17.4±0.8 (16.2-18)
Median bulb length/diam. ratio 1.5 1.4±0.1 (1.3-1.5) 1.5±0.1 (1.4-1.5)
Excretory pore from anterior end 92.2 96.3±4.7 (88-104) 83.2±2.5 (80.1-87)
Ovary length or testis 430 454±24 (420-480) 622.6±76.6 (476-690)
Post-uterine sac 121 130.3±6.1 (119-138) –
Vulva to anus distance 270 264.2±20.9 (233-300) –
Post-uterine sac length/vulva to anus (%) 44.8 49.8±5.5 (39.7-55.8) –
Anal (cloacal) body diameter 14.1 13.3±0.7 (12-14.1) 16.3±1.0 (15.3-18.2)
Tail length 36.1 34.9±3.2 (29-38.6) 44.1±1.8 (41.8-46.4)
Spicule (curved median line) – – 14.0±0.6 (13.2-15)
Spicule (Chord) – – 15.6±0.9 (14.1-16.6)
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