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Cephalenchus driekieae n. sp. (Nematoda: Tylenchidae) from South Africa, a new member of the genus with a long pharyngeal overlap

Milad Rashidifard
Milad Rashidifard
, 
Gerhard Du Preez
Gerhard Du Preez
, 
Joaquín Abolafia
Joaquín Abolafia
 y 
Majid Pedram
Majid Pedram
   | 24 abr 2020
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Publicado en línea: 24 abr 2020
Páginas: 1 - 10
Recibido: 30 ene 2020
DOI: https://doi.org/10.21307/jofnem-2020-031
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© 2020 Milad Rashidifard 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 Cephalenchus driekieae n. sp. from South Africa, female. (A) Entire body; (B) anterior region; (C) pharyngeal region; (D) reproductive system; (E) tail.
Line drawings of Cephalenchus driekieae n. sp. from South Africa, female. (A) Entire body; (B) anterior region; (C) pharyngeal region; (D) reproductive system; (E) tail.

Figure 2:

Light micrographs of Cephalenchus driekieae n. sp. from South Africa, female. (A) Entire body; (B) pharyngeal region; (C) lateral lines; (D) part of reproduction system; (E) anterior region; (F) pharyngeal overlap; (G) tail; (H) tail terminus. (Scale bars = 10 µm).
Light micrographs of Cephalenchus driekieae n. sp. from South Africa, female. (A) Entire body; (B) pharyngeal region; (C) lateral lines; (D) part of reproduction system; (E) anterior region; (F) pharyngeal overlap; (G) tail; (H) tail terminus. (Scale bars = 10 µm).

Figure 3:

Scanning electron microscopy of Cephalenchus driekieae n. sp. from South Africa, female. (A) Anterior region; (B) lip region; (C) posterior body region; (D, E) vulval region in lateral and ventral view; (F) anus and lateral lines in anus region.
Scanning electron microscopy of Cephalenchus driekieae n. sp. from South Africa, female. (A) Anterior region; (B) lip region; (C) posterior body region; (D, E) vulval region in lateral and ventral view; (F) anus and lateral lines in anus region.

Figure 4:

Bayesian 50% majority rule consensus tree inferred from small subunit (SSU) rDNA gene sequence of Cephalenchus driekieae n. sp. from South Africa under GTR + I + G model (lnL = 6,436.7202; freqA = 0.2443; freqC = 0.2268; freqG = 0.2864; freqT = 0.2425; rAC = 1.0699; rAG = 2.8891; rAT = 1.2180; rCG = 1.1273; rCT = 5.8691; Pinv = 0.4073; Alpha = 0.6044). Bayesian posterior probability (BPP) values >0.50 are given for appropriate clades. The sequence of the new species is indicated by bold font.
Bayesian 50% majority rule consensus tree inferred from small subunit (SSU) rDNA gene sequence of Cephalenchus driekieae n. sp. from South Africa under GTR + I + G model (lnL = 6,436.7202; freqA = 0.2443; freqC = 0.2268; freqG = 0.2864; freqT = 0.2425; rAC = 1.0699; rAG = 2.8891; rAT = 1.2180; rCG = 1.1273; rCT = 5.8691; Pinv = 0.4073; Alpha = 0.6044). Bayesian posterior probability (BPP) values >0.50 are given for appropriate clades. The sequence of the new species is indicated by bold font.

Figure 5:

Bayesian 50% majority rule consensus tree inferred from D2-D3 expansion segments of large subunit (LSU) rDNA gene sequence of Cephalenchus driekieae n. sp. from South Africa under GTR + I + G model (lnL = 7,632.2964; freqA = 0.1794; freqC = 0.2463; freqG = 0.3573; freqT = 0.2170; rAC = 0.9583; rAG = 2.6626; rAT = 1.2424; rCG = 0.6711; rCT = 5.4981; Pinv = 0.2528; Alpha = 0.6707). Bayesian posterior probability (BPP) values >0.50 are given for appropriate clades. The sequence of the new species is indicated by bold font.
Bayesian 50% majority rule consensus tree inferred from D2-D3 expansion segments of large subunit (LSU) rDNA gene sequence of Cephalenchus driekieae n. sp. from South Africa under GTR + I + G model (lnL = 7,632.2964; freqA = 0.1794; freqC = 0.2463; freqG = 0.3573; freqT = 0.2170; rAC = 0.9583; rAG = 2.6626; rAT = 1.2424; rCG = 0.6711; rCT = 5.4981; Pinv = 0.2528; Alpha = 0.6707). Bayesian posterior probability (BPP) values >0.50 are given for appropriate clades. The sequence of the new species is indicated by bold font.

Morphometric measurements of Cephalenchus driekieae n. sp. from South Africa.

Female
Characters Holotype Paratypes
n 1 8
L 456 483.5 ± 24.5 (451–526)
a 36.5 34.8 ± 1.3 (33.3–36.5)
b 7 7.3 ± 0.5 (6.8–8.0)
c 4 4.3 ± 0.1 (4.1–4.5)
c´ 12.2 13.6 ± 1.3 (11.5–15.0)
V 65.8 64.8 ± 2.0 (60.5–67.0)
V´ 86.5 83.0 ± 3.3 (75.5–86.5)
Lip region height 2 2.4 ± 0.4 (2–3)
Lip region width 5.5 6.0 ± 0.5 (5.5–7.0)
Stylet conus length 5 5.4 ± 0.6 (4.4–6.3)
Stylet length 12 12.0 ± 0.5 (11.5–13.0)
DGO 1.8 1.3 ± 0.3 (1.0–1.8)
Median bulb valve to ant. end 31 31.0 ± 0.5 (30–32)
MB% 6.8 6.5 ± 0.3 (6–7)
Pharynx (stylet knobs to pharynx-intestinal junction) 56 64.5 ± 5.0 (56–71)
Neck (anterior end to pharynx-intestinal junction) 70 65 ± 3 (61–70)
Excretory pore – ant. end – 61.5 ± 3.0 (57–65)
Hemizonid – ant. end. 49 58 ± 5 (49–62)
Anterior end to vulva 300 313 ± 22 (280–353)
 – to anus 346 372 ± 20 (344–393)
Body width at median bulb 11 12.0 ± 0.5 (11–13)
 – at vulva 12.5 14 ± 1 (12.5–15.5)
 – at anus 9 8.5 ± 1.0 (7.5–10.0)
Post-vulval uterine sac length 13 13.5 ± 0.5 (13–14)
Tail length 110 111.0 ± 3.5 (105–116)
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