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An interesting rare tylenchid species, Antarctenchus urmiensis n. sp. (Tylenchomorpha; Psilenchidae) from Urmia Lake islands, northwest Iran, with a discussion on the taxonomy of related genera


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Figure 1:

Line drawings of Antarctenchus urmiensis n. sp. (A-C, E-I: Female; D&J: Male) (A) Pharynx; (B) Anterior genital tract; (C&E) Anterior body end; (D) Male reproductive system; (F) Vulval region; (G&H) Female tail (phasmids are shown at two foci); (I) Bursa; (J) Male tail, spicule, and bursa.
Line drawings of Antarctenchus urmiensis n. sp. (A-C, E-I: Female; D&J: Male) (A) Pharynx; (B) Anterior genital tract; (C&E) Anterior body end; (D) Male reproductive system; (F) Vulval region; (G&H) Female tail (phasmids are shown at two foci); (I) Bursa; (J) Male tail, spicule, and bursa.

Figure 2:

Light micrographs of Antarctenchus urmiensis n. sp. (A,B,E,F,G,H,I,J,M,P,Q: Female; C,D,K,L,N,O,R: Male) (A-D) Anterior body end; (E) Anterior body region; (F) Pharyngeal median bulb; (G) Part of female reproductive system; (H) Distal end of ovary; (I) Pharyngeal bulb; (J) Lateral lines; (K) Male tail; (L) Phasmid; (M) Female tail; (N) Bursa; (O&P) Entire body; (Q) Vulval region; (R) Spicule and gubernaculum. (Scale bars: A-N, Q&R = 10 μm; O&P = 50 μm).
Light micrographs of Antarctenchus urmiensis n. sp. (A,B,E,F,G,H,I,J,M,P,Q: Female; C,D,K,L,N,O,R: Male) (A-D) Anterior body end; (E) Anterior body region; (F) Pharyngeal median bulb; (G) Part of female reproductive system; (H) Distal end of ovary; (I) Pharyngeal bulb; (J) Lateral lines; (K) Male tail; (L) Phasmid; (M) Female tail; (N) Bursa; (O&P) Entire body; (Q) Vulval region; (R) Spicule and gubernaculum. (Scale bars: A-N, Q&R = 10 μm; O&P = 50 μm).

Figure 3:

Scanning electron microscopic (SEM) images of Antarctenchus urmiensis n. sp. (Female) (A-C) Anterior end in ventral, sublateral and frontal views, respectively (arrows pointing the amphidial openings); (D) Deirid (withe arrow) and excretory pore in lateral view (black arrow); (E) Secretory-excretory pore (arrow); (F) Lateral field; (G&H) Vulva in lateral and ventral views, respectively; (I) Posterior end in lateral view (arrow pointing the anus);(J) Anus (arrow) in lateral view; (K) Tail tip.
Scanning electron microscopic (SEM) images of Antarctenchus urmiensis n. sp. (Female) (A-C) Anterior end in ventral, sublateral and frontal views, respectively (arrows pointing the amphidial openings); (D) Deirid (withe arrow) and excretory pore in lateral view (black arrow); (E) Secretory-excretory pore (arrow); (F) Lateral field; (G&H) Vulva in lateral and ventral views, respectively; (I) Posterior end in lateral view (arrow pointing the anus);(J) Anus (arrow) in lateral view; (K) Tail tip.

Figure 4:

Bayesian 50% majority rule consensus tree of Antarctenchus urmiensis n. sp. based on SSU rDNA sequences under GTR + I + G model. Bayesian posterior probability values more than 0.50 are given for appropriate clades. The new sequence is indicated in bold.
Bayesian 50% majority rule consensus tree of Antarctenchus urmiensis n. sp. based on SSU rDNA sequences under GTR + I + G model. Bayesian posterior probability values more than 0.50 are given for appropriate clades. The new sequence is indicated in bold.

Figure 5:

Bayesian 50% majority rule consensus tree of Antarctenchus urmiensis n. sp. based on LSU rDNA D2-D3 sequences under GTR + I + G model. Bayesian posterior probability values more than 0.50 are given for appropriate clades. The new sequence is indicated in bold.
Bayesian 50% majority rule consensus tree of Antarctenchus urmiensis n. sp. based on LSU rDNA D2-D3 sequences under GTR + I + G model. Bayesian posterior probability values more than 0.50 are given for appropriate clades. The new sequence is indicated in bold.

Figure S1:

The SSU tree inferred using the original data by Hosseinvand et al. (2020), the same alignment, postediting and inference methods; but using aphelenchs as outgroup taxa.
The SSU tree inferred using the original data by Hosseinvand et al. (2020), the same alignment, postediting and inference methods; but using aphelenchs as outgroup taxa.

Morphometrics of Antarctenchus urmiensis n. sp. All measurement are in µm and in the form: mean ± s.d. (range).

Holotype Paratypes
Female Females Males
n 1 8 8
L 1,095 1,022 ± 96 895 ± 40
(875–1,162) (819–942)
a 45.6 41.7 ± 2.4 38.9 ± 2.3
(38.5–45.6) (35.6–42.8)
b 6.7 6.5 ± 0.8 5.7 ± 0.3
(5.5–8.2) (5.1–5.9)
c 15.2 15.5 ± 1.3 14.1 ± 0.6
(14.2–18.2) (13.5–15.5)
5.5 5.1 ± 0.5 3.7 ± 0.2
(4.0–5.8) (3.4–4.0)
V 54 55.0 ± 0.0
(54–58)
Cephalic region width at apex 6 6.4 ± 0.6 5.7 ± 0.5
(5.5–7.0) (5.0–6.5)
Cephalic region width at base 9.5 9.5 ± 0.4 9.1 ± 0.3
(9.0–10.4) (8.5–9.5)
Cephalic region height 2.8 2.8 ± 0.3 2.6 ± 0.3
(2.3–3.2) (2.2–3.0)
Stylet conus length 5.5 5.5 ± 0.4 5.7 ± 0.7
(5–6) (5–7)
Stylet total length 13 13.9 ± 0.4 14.0 ± 0.5
(13.0–14.5) (13.5–15.0)
Dorsal gland orifice (DGO) 2.5 2.2 ± 0.3 2.4 ± 0.5
(2.0–2.8) (2.0–3.2)
Anterior end to median bulb distance 69 68.6 ± 5.7 69.8 ± 1.8
(58–77) (67–72)
Median bulb length 19 19.8 ± 1.3 20.8 ± 0.7
(18–21) (20–22)
Median bulb width 11 11.1 ± 0.6 10.0 ± 0.5
(10–12) (9–11)
Anterior end to nerve ring distance 101 109.3 ± 8.6 100.3 ± 7.0
(94–122) (92–115)
Anterior end to hemizonid distance 117 121.6 ± 6.7 115.4 ± 4.9
(112–131) (110–126)
Anterior end to excretory pore distance 121 127.4 ± 6.5 122.0 ± 4.6
(119–135) (117–132)
Neck (stoma + pharynx) 162 158.3 ± 11.4 157.1 ± 3.0
(132–168) (151–160)
Anterior end to vulva distance 592 568.4 ± 45.3
(511–644)
Body width at vulva or cloaca 24 24.6 ± 2.4 23.0 ± 0.8
(21–29) (22–24)
Body width at anus 13 13.1 ± 2.2 17.4 ± 1.1
(11–18) (16–19)
Anterior genital branch/testis length 254 261.6 ± 37.4 475.0 ± 35.8
(207–317) (421–530)
Posterior genital branch length 250 254.1 ± 37.3
(208–332)
Tail length 72 66.3 ± 6.4 63.4 ± 2.9
(60–73) (59–67)
Anus to phasmid distance 30 33.8 ± 4.1 34.4 ± 4.7
(27–42) (27–43)
Spicules length 25.6 ± 1.6
(24–29)
Gubernaculum length 10.1 ± 1.0
(8–11)
eISSN:
2640-396X
Język:
Angielski
Częstotliwość wydawania:
Volume Open
Dziedziny czasopisma:
Life Sciences, other