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Morphological Characterization of Fresh and 20-Yr-Old Fixed Nematode Specimens of Sauertylenchus maximus (Allen, 1955) Siddiqi, 2000 Deposited in the USDA Nematode Collection from Arlington National Cemetery, VA, USA

Mihail R. Kantor
Mihail R. Kantor
, 
Paulo Vieira
Paulo Vieira
, 
Andrea M. Skantar
Andrea M. Skantar
, 
Gregory Huse
Gregory Huse
 et 
Zafar A. Handoo
Zafar A. Handoo
   | 19 oct. 2022
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Article Category: Research Paper
Publié en ligne: 19 oct. 2022
Pages: -
Reçu: 26 avr. 2022
DOI: https://doi.org/10.2478/jofnem-2022-0041
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© 2022 Kantor et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1

Photomicrographs of fresh and fixed females of Sauertylenchus maximus (Allen, 1955) Siddiqi, 2000 from Virginia. (A) Entire female (fresh); (B) anterior end of fixed female; (C) vulva and tail area of fresh female; (D) tail of fixed female, and the arrow points to the anal opening; (E) esophageal area of fixed female; (F) excretory pore (arrow pointing at it) of fixed female; (G) lateral view of fixed female with four incisures, the two lines being aerolated.
Photomicrographs of fresh and fixed females of Sauertylenchus maximus (Allen, 1955) Siddiqi, 2000 from Virginia. (A) Entire female (fresh); (B) anterior end of fixed female; (C) vulva and tail area of fresh female; (D) tail of fixed female, and the arrow points to the anal opening; (E) esophageal area of fixed female; (F) excretory pore (arrow pointing at it) of fixed female; (G) lateral view of fixed female with four incisures, the two lines being aerolated.

Figure 2

Phylogenetic relationships of Sauertylenchus maximus (Allen, 1955) Siddiqi, 2000 isolates with closely related Telotylenchinae (Allen, 1955) Siddiqi, 2000 species. Bayesian 50% majority rule consensus tree inferred from 28S rDNA D2–D3 sequences alignment under the general time-reversible model of sequence evolution, with correction for invariable sites and a gamma-shaped distribution (GTR + I + G). New sequences are shown in bold. PP are shown on appropriate branches. PP, posterior probabilities. GTR, general time reversible.
Phylogenetic relationships of Sauertylenchus maximus (Allen, 1955) Siddiqi, 2000 isolates with closely related Telotylenchinae (Allen, 1955) Siddiqi, 2000 species. Bayesian 50% majority rule consensus tree inferred from 28S rDNA D2–D3 sequences alignment under the general time-reversible model of sequence evolution, with correction for invariable sites and a gamma-shaped distribution (GTR + I + G). New sequences are shown in bold. PP are shown on appropriate branches. PP, posterior probabilities. GTR, general time reversible.

Figure 3

Phylogenetic relationships of Sauertylenchus maximus (Allen, 1955) Siddiqi, 2000 isolates with closely related Telotylenchinae Siddiqi, 1960 species. Bayesian 50% majority rule consensus tree inferred from ITS rRNA sequence alignment under the general time reversible model of sequence evolution, with correction for invariable sites and a gamma-shaped distribution (GTR + I + G). New sequences are shown in bold. PP are shown on appropriate branches. GTR, general time reversible; ITS, internal transcribed spacer; PP, posterior probabilities.
Phylogenetic relationships of Sauertylenchus maximus (Allen, 1955) Siddiqi, 2000 isolates with closely related Telotylenchinae Siddiqi, 1960 species. Bayesian 50% majority rule consensus tree inferred from ITS rRNA sequence alignment under the general time reversible model of sequence evolution, with correction for invariable sites and a gamma-shaped distribution (GTR + I + G). New sequences are shown in bold. PP are shown on appropriate branches. GTR, general time reversible; ITS, internal transcribed spacer; PP, posterior probabilities.

Figure 4

Phylogenetic relationships of Sauertylenchus maximus (Allen, 1955) Siddiqi, 2000 isolates with closely related Telotylenchinae Siddiqi, 1960 species. Bayesian 50% majority rule consensus tree inferred from 18S rRNA sequence alignment under the general time reversible model of sequence evolution, with correction for invariable sites and a gamma-shaped distribution (GTR + I + G). New sequences are shown in bold. PP are shown on appropriate branches. GTR, general time reversible; PP, posterior probabilities.
Phylogenetic relationships of Sauertylenchus maximus (Allen, 1955) Siddiqi, 2000 isolates with closely related Telotylenchinae Siddiqi, 1960 species. Bayesian 50% majority rule consensus tree inferred from 18S rRNA sequence alignment under the general time reversible model of sequence evolution, with correction for invariable sites and a gamma-shaped distribution (GTR + I + G). New sequences are shown in bold. PP are shown on appropriate branches. GTR, general time reversible; PP, posterior probabilities.

Morphometrics of several populations of Sauertylenchus maximus Allen, 1955.

Characteristic S. maximus from Virginia(this paper) S. maximusAfter Allen (1955) S. maximusAfter Yildiz et al. (2012) S. maximusAfter Geraert (2011)
Fresh female specimens Fixed female specimens (vial G-4280) Females Females Females
n 6 9 12 10 ?
L 1,253.0 ± 95.3 (1,133–1,425) 1,313.0 ± 60.7 (1,260–1,472) 980–1,140 1,094.0 ± 95.1 (932–1,210) 940–1,620
A 36.4 ± 2.0 (33.3–38.7) 43.0 ± 1.7 (40.3–45.8) 37–47 47.9±4.2 (41.6–53.7) 28–58
B 9.1 ± 0.6 (8.3–9.9) 8.0 ± 0.4 (7.5–9.0) 5.4–8.1 7.0 ± 0.5 (6.2–8.0) –
C 19.4 ± 0.7 (18.6–20.8) 21 ± 1 (19.4–22.3) 16–20 19.2 ± 1.7 (17.2–23.0) 16–26
c’ 2.5 ± 0.2 (2.2–2.8) 2.8 ± 0.2 (2.6–3.1) – – 1.9–4.1
Stylet 22 ± 1 (20–23) 22 ± 1 (21–23) 21.3–24.0 21.5 ± 0.95 (20.5–23.0) 20.0–24.5
Anal body diam. 26 ± 2 (22–28) 23.0 ± 1.5 (21–26) – 18.2 ± 1.6 (15.5–20.0) –
Max. body diam. 34 ± 3 (30–38) 30.0 ± 1.7 (27.5–33.0) – 22.8 ± 2.0 (20–26) 23–32
Pharynx length 137.5 ± 6.3 (130–150) 160.0 ± 7.8 (150–172) – 156.0 ± 6.9 (150–70) 153–192
Anterior end to excretory pore 113 ± 13 (101–135) 128 ± 4 (122–135) – – –
Tail length 65 ± 5 (60–75) 64.0 ± 2.8 (60–70) – 56.8 ± 5.4 (48–65) 42–83
V% 50 ± 1 (49–52) 52.0 ± 1.3 (50.2–54.0) – 52.5 ± 2.0 (48–65) 47–58
Lip annules 5 5–7 – 5–7 –
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