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FIGURE 3 in Metaxonchium persicum sp. n. from Iran (Nematoda, Dorylaimida, Belondiridae), with an updated taxonomy of the genus

FIGURE 3. Metaxonchium persicum sp. n. (Male, LM). A: Entire. B-D: Posterior body region showing the location of ventromedian supplements. E: Detail of three ventromedian supplements. F, G: Spicules. H: Caudal region. (Scale bars: A = 500 µm; B = 100 µm; C, D = 50 µm; E-H = 20 µm.)

FIGURE 4 in Metaxonchium persicum sp. n. from Iran (Nematoda, Dorylaimida, Belondiridae), with an updated taxonomy of the genus

FIGURE 4. Metaxonchium persicum sp. n. (Female, SEM). A: Lip region in frontal view. B: Vulva in ventral view. C: Caudal region in latero-ventral view. (Scale bars: A = 2 µm; B, C = 5 µm.)

FIGURE 2 in Metaxonchium persicum sp. n. from Iran (Nematoda, Dorylaimida, Belondiridae), with an updated taxonomy of the genus

FIGURE 2. Metaxonchium persicum sp. n. (Female, LM). A: Entire. B: Anterior region in lateral median view. C: Slender portion of pharynx, showing the spindle-shaped thickening. D: Detail of spindle-shaped thickening at the anterior portion of pharynx. E: Genital system. F: Detail of the uterus showing apophyses. G: Isthmus-like junction of both pharyngeal sections. H: Vagina. I: Vagina and tripartite uterus. J: Caudal region. K: Pharyngo-intestinal junction. (Scale bars: A = 500 µm; B, F, G, J, K = 20 µm; C, I = 50 µm; D, H = 10 µm; E = 100 µm.)

FIGURE 1 in Metaxonchium persicum sp. n. from Iran (Nematoda, Dorylaimida, Belondiridae), with an updated taxonomy of the genus

FIGURE 1. Metaxonchium persicum sp. n. A: Anterior region in median lateral view. B: Lip region in lateral, surface view. C: Detail of spindle-shaped thickening at the anterior portion of pharynx. D: Vagina. E: Detail of the uterus showing apophyses. F: Female, Genital system. G: Isthmus-like junction of both pharyngeal sections. H: Neck. I: Pharyngo-intestinal junction. J: Female, entire body. K: Male, posterior body region. L: Female, caudal region. M: Spicule and lateral guiding piece.

FIGURE 4 in Two new species of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda, Dorylaimida, Belondiridae) from Vietnam

FIGURE 4. Metaxonchium bonkowskii sp. n. (Female, SEM). A: Lip region in sublateral vieW. B: Same in face vieW. C: Caudal region in lateral vieW. D: Same in ventral vieW. E: Vagina in ventral vieW. (Scale bars: A, B = 2 µm; C–E = 4 µm.)

FIGURE 1 in Two new species of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda, Dorylaimida, Belondiridae) from Vietnam

FIGURE 1. Metaxonchium bonkowskii sp. n. (Female). A: Entire. B: Anterior region in lateral, median vieW. C: Anterior region in lateral surface vieW. D: Genital system. E: Pharyngeal enlargement. F: Posterior body region. G: Pharyngo–intestinal junction. H: Vagina. I: Caudal region. J: Oviduct–uterus junction. (Scale bars: A = 200 µm; B, C = 5 µm; D = 50 µm; E, H, I = 10 µm; F, G, J = 20 µm.)

FIGURE 6 in Two new species of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda, Dorylaimida, Belondiridae) from Vietnam

FIGURE 6. Metaxonchium silvaticum sp. n. (Female, LM). A: Female, entire. B: Anterior region in lateral median view. C: Pharyngo–intestinal junction. D: Uterus. E: Male, entire. F: Vagina. G, Q: Spicule. H: Sperm cells. I, J, L, M, N: Female, caudal region. K: Female, posterior body region. O, P: Male, caudal region and spicule. (Scale bars: A, E = 200 µm; B, F, H = 5 µm; C, G, I, J, L–Q = 10 µm; D, K = 20 µm.)

FIGURE 3 in Two new species of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda, Dorylaimida, Belondiridae) from Vietnam

FIGURE 3. Metaxonchium bonkowskii sp. n. (Female, LM). A, D: Genital system. B: Anteior uterine sac. C: Uterine egg. E, G, K: Oviduct–uterus junction, shoWing (arroWs) the Z–organ. F, H: Vagina. I: Sperm cells. J: Detail of Z–organ granules. (Scale bars: A, C, D, G = 50 µm; B, E = 20 µm; F, K = 10 µm; H–J = 5 µm.)

FIGURE 2 in Two new species of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda, Dorylaimida, Belondiridae) from Vietnam

FIGURE 2. Metaxonchium bonkowskii sp. n. (Female, LM). A, B, F: Entire. C, D, H: Anterior region in lateral, median vieW. E, I: Anterior region in lateral surface vieW. F: Genital system. G: Posterior body region. H: Vagina and uterine egg. I–K: Caudal region. L: Vagina. (Scale bars: A, B, F = 200 µm; C, D, E, H, I = 5 µm; G, L–N = 10 µm; G, J, K = 20 µm.)

FIGURE 5 in Two new species of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda, Dorylaimida, Belondiridae) from Vietnam

FIGURE 5. Metaxonchium silvaticum sp. n. (Female). A: Female, entire. B: Anterior region in lateral median vieW. C: Pharyngo–intestinal junction. D: Vagina. E: Male, entire. F–H: Female, caudal region. I: Female, genital system, J: Female: posterior body region. K: Male, caudal region. L: Spicule and lateral guiding piece. (Scale bars: A, E = 200 µm; B, D = 5 µm; C, F–H, K, L = 10 µm; I = 50 µm; J = 20 µm.)

Fig. 6 in General morphology, taxonomy and phylogeny of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda: Dorylaimida: Belondiridae)

Fig. 6. Bayesian Inference tree from known and the newly sequenced Metaxonchium giennense based on sequences of the 18S rDNA region. Bayesian posterior probabilities (%) are given for each clade. Scale bar shows the number of substitutions per site.

Fig. 3 in General morphology, taxonomy and phylogeny of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda: Dorylaimida: Belondiridae)

Fig. 3. Female genital system of Metaxonchium species (A, F, H) M. persicum (B) M. stenospiculum (C, G) M. bonkowskii (D) M. silvaticum (E) M. echinulatum (I) M. gigas (A–D) Entire (E, F) Spine- or thorn-like elements of echinophor uterus (G) Detail of Z-like organ (H, I) Vagina region [(E) after Andr´assy (1996: 59, Fig. 5 (I) after Nair (1973: 177, Fig. 5b.].

Fig. 1 in General morphology, taxonomy and phylogeny of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda: Dorylaimida: Belondiridae)

Fig. 1. Lip region of Metaxonchium species (SEM pictures) (A, D, G) M. bonkowskii (B, E, H) M. magnum (C, F, I) M. stenospiculum (A–C) Lateral view (D–F) In face view (G–I) Detail of labial and cephalic papillae, arrow head pointing at cephallic papillae.

Fig. 7 in General morphology, taxonomy and phylogeny of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda: Dorylaimida: Belondiridae)

Fig. 7. Bayesian Inference tree from known and the newly sequenced Metaxonchium giennense based on sequences of the 28S rDNA region. Bayesian posterior probabilities (%) are given for each clade. Scale bar shows the number of substitutions per site.

Fig. 2 in General morphology, taxonomy and phylogeny of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda: Dorylaimida: Belondiridae)

Fig. 2. Anterior region and pharyngeal elements of Metaxonchium species (A, B, D, E, I) M. persicum (C, G) M. torense (F, J) M. gigas (H) M. silvaticum (A–C) Anterior region in lateral median view, arrow head pointing at valvate swelling of anterior pharyngeal region (D) Detail of valvate swelling of anterior pharyngeal region (E, F) Isthmus-like narrowing between both pharyngeal regions (G–J) Pharyngo-intestinal junction [(F, J) after Nair (1973: 174, Fig. 4.)].

Fig. 5 in General morphology, taxonomy and phylogeny of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda: Dorylaimida: Belondiridae)

Fig. 5. Caudal region of Metaxonchium species (A, E) M. serpens (B, F) M. persicum (C, G) M. magnum (D) M. toroense (H) M. bonkowskii (A-D, H) Female (E–G) Male [(A, E) modified from Nair (1973: 183).].

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Fig. 4 in General morphology, taxonomy and phylogeny of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda: Dorylaimida: Belondiridae)

Fig. 4. Accessory structures of male genital system in Metaxonchium species (A, E) M. choristum (B, F M. gigas (C, G) M. serpens (D, H) M. coronatum (I) M. persicum (J) M. stenospiculum (A–D) Posterior body region showing the arrangement of ventromedian supplements (E–J) Spicule with its corresponding lateral guiding piece [(A–H) modified from Nair (1973: 170, 176 & 183) and Nair and Coomans (1974: 71).].