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Basilaphelenchus hyrcanus n. sp. (Rhabditida: Tylaphelenchinae) associated with bark of a beech tree (Fagus orientalis Lipsky) from northern Iran

Behrouz Golhasan
Behrouz Golhasan
, 
Esmaeil Miraeiz
Esmaeil Miraeiz
, 
Zahra Tanha maafi
Zahra Tanha maafi
 und 
Ramin Heydari
Ramin Heydari
   | 01. Jan. 2021
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Online veröffentlicht: 01. Jan. 2021
Seitenbereich: 1 - 11
DOI: https://doi.org/10.21307/jofnem-2021-028
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© 2021 Authors, published by Sciendo.
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1:

Line drawing of Basilaphelenchus hyrcanus n. sp. (A) Female entire body – (B) Male entire body – (C) Female head – (D) Vulval region – (E) Anterior body – (F) Male posterior region in lateral view showing genital papillae (P2-P4) − (G) Female posterior region (Scale bars: A-C and E, F = 10 μm; D, G = 20 μm.)
Line drawing of Basilaphelenchus hyrcanus n. sp. (A) Female entire body – (B) Male entire body – (C) Female head – (D) Vulval region – (E) Anterior body – (F) Male posterior region in lateral view showing genital papillae (P2-P4) − (G) Female posterior region (Scale bars: A-C and E, F = 10 μm; D, G = 20 μm.)

Figure 2:

Photomicrographs of Basilaphelenchus hyrcanus n. sp. (A-C) Female anterior body – (D) Part of pharynx– (E-G) Metacorpus region showing excretory pore (arrowhead) – (H) Lateral field – (I) Male posterior body showing spicules and papillae arrangement (P2 + P4 arrowheads) – (J, K) Vulval region showing post-vulval uterine sac (arrowhead) – (L, M) Female tail (Scale bars = 10 μm.)
Photomicrographs of Basilaphelenchus hyrcanus n. sp. (A-C) Female anterior body – (D) Part of pharynx– (E-G) Metacorpus region showing excretory pore (arrowhead) – (H) Lateral field – (I) Male posterior body showing spicules and papillae arrangement (P2 + P4 arrowheads) – (J, K) Vulval region showing post-vulval uterine sac (arrowhead) – (L, M) Female tail (Scale bars = 10 μm.)

Figure 3:

Bayesian 50% majority rule consensus tree inferred from the small subunit (SSU) rDNA gene sequences of Basilaphelenchus hyrcanus n. sp. under the GTR + G + I model. Bayesian posterior probabilities (BPP) and maximum likelihood bootstrap (ML BS) values greater than 0.50 and 50, respectively, are given for appropriate clades in the pattern of BPP/ML BS. The new species taxon is represented in bold.
Bayesian 50% majority rule consensus tree inferred from the small subunit (SSU) rDNA gene sequences of Basilaphelenchus hyrcanus n. sp. under the GTR + G + I model. Bayesian posterior probabilities (BPP) and maximum likelihood bootstrap (ML BS) values greater than 0.50 and 50, respectively, are given for appropriate clades in the pattern of BPP/ML BS. The new species taxon is represented in bold.

Figure 4:

Bayesian 50% majority rule consensus tree inferred from the D2-D3 large subunit (LSU) rDNA gene sequences of Basilaphelenchus hyrcanus n. sp. under the GTR + G + I model. Bayesian posterior probabilities (BPP) and maximum likelihood bootstrap (ML BS) values greater than 0.50 and 50, respectively, are given for appropriate clades in the pattern of BPP/ML BS. The new species taxon is represented in bold.
Bayesian 50% majority rule consensus tree inferred from the D2-D3 large subunit (LSU) rDNA gene sequences of Basilaphelenchus hyrcanus n. sp. under the GTR + G + I model. Bayesian posterior probabilities (BPP) and maximum likelihood bootstrap (ML BS) values greater than 0.50 and 50, respectively, are given for appropriate clades in the pattern of BPP/ML BS. The new species taxon is represented in bold.

Morphometric data for Basilaphelenchus hyrcanus n. sp. (measurements μm; mean ± s.d. and (range) for paratypes).

Female Male
Character Holotype Paratypes Paratypes
n – 10 7
L 350 383 ± 34.0 (316–418) 370 ± 15.1 (350–395)
a 32.0 37.0 ± 3.5 (31.6–41.8) 40.0 ± 2.2 (37.4–44.0)
b 7.6 8.3 ± 0.7 (7.3–9.5) 7.3 ± 0.2 (7.0–7.6)
b′ 3.6 4.0 ± 0.2 (3.5–4.1) 3.6 ± 0.3 (3.3–4.2)
c 12.1 13.0 ± 0.9 (11.5–14.0) 13.6 ± 0.5 (12.8–14.2)
c′ 4.8 5.4 ± 0.5 (4.8–6.2) 3.8 ± 0.4 (3.1–4.3)
Vc or T 71.4 69.7 ± 3 (63.0–75.5) 57.3 ± 3.1 (53.5–60.8)
Lip region height 2.0 2.0 ± 0.2 (2.0–2.5) 2.1 ± 0.2 (2.0–2.5)
Lip region width 5.0 4.8 ± 0.4 (4.0–5.0) 4.9 ± 0.4 (4.0–5.0)
Stylet length 9.0 9.4 ± 0.5 (9.0–10.0) 9.3 ± 0.5 (9.0–10.0)
Conus length 4.0 3.4 ± 0.5 (3.0–4.0) 3.4 ± 0.5 (3.0–4.0)
m1 44.0 36.0 ± 3.4 (34.0–40.0) 36.0 ± 2.7 (34.0–44.0)
Maximum body diam. 11.0 10.3 ± 0.5 (10.0–11.0) 9.3 ± 0.5 (9.0–10.0)
MB2 80.0 85.0 ± 1.8 (83.3–88.0) 86.5 ± 1.3 (84.6–88.2)
Median bulb width 6.0 6.2 ± 0.6 (5.0–7.0) 6.3 ± 0.5 (6.0–7.0)
Median bulb length 10.0 10.7 ± 0.7 (10.0–12.0) 11.1 ± 0.4 (11.0–12.0)
Median bulb length/diam. Ratio 1.7 1.7 ± 0.1 (1.6–2.0) 1.8 ± 0.2 (1.6–2.0)
Nerve ring from anterior body 54.0 51.1 ± 4.1 (45.0–55.0) 56.0 ± 1.8 (55.0–60.0)
Excretory pore from anterior end 44.0 44.1 ± 2.8 (40.0–48.0) 48.6 ± 1.3 (46.0–50.0)
Ovary or Testis length 130 138 ± 10.3 (125–155) 212 ± 16.3 (190–240)
Post-uterine sac 42.0 45.3 ± 7.0 (38.0–60.0) –
Vulva to anus distance 88.0 89.0 ± 9.2 (68.0–98.0) –
Post-uterine sac length/vulva to anus (%) 47.7 51.4 ± 9.3 (42.1–70.6) –
Vulval body diam. 10.0 9.3 ± 0.7 (8.0–10.0) –
Anal (cloacal) body diam. 6.0 5.6 ± 0.5 (5.0–6.0) 7.3 ± 0.5 (7.0–8.0)
Tail length 29.0 30.0 ± 1.1 (28.0–31.0) 27.3 ± 2.0 (25.0–30.0)
Spicule length (arc) – – 10.3 ± 0.5 (10.0–11.0)
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