taxonID	type	description	language	source
89FC6489305252749DA4E2347AF20823.taxon	description	Figs 4, 5, 6, Tables 3, 4	en	Liang, Siwei, Islam, Md Niraul, Du, Xiaofang, Li, Ying bin, Liang, Wenju, Ahmad, Wasim, Zhang, Xiaoke, Mahamood, Mohammad, Alhewairini, Saleh, Li, Qi (2025): Two new and two known species of the genus Eudorylaimus Andrássy, 1959 (Nematoda, Dorylaimoidea, Qudsianematidae) from Northeast China. ZooKeys 1238: 41-74, DOI: 10.3897/zookeys.1238.138550
89FC6489305252749DA4E2347AF20823.taxon	diagnosis	Diagnosis. Eudorylaimus blisterocaudatus sp. nov. is characterized by its 1.0 – 1.3 mm long slender body; lip region offset by constriction and 15 – 17 μm broad; odontostyle 18 – 19 μm with an aperture ~ 37 – 40 % of its length, odontophore 24 – 28 μm long, 1.3 – 1.5 times the odontostyle length, total stylet length 42 – 46 μm; pharynx 300 – 339 μm long, pharyngeal expansion 129 – 156 μm or ~ 41 – 47 % of the total pharyngeal length; cardia long 17 – 26 μm or 0.42 – 0.58 times the corresponding body diameter long; female genital system didelphic-amphidelphic, uterus long, well-differentiated; V = 59 – 63 %; tail short (35 – 49 μm, c = 23.3 – 34.7, c’ = 1.2 – 1.7), conoid with rounded to sub-clavate terminus, and bearing series of blisters (thickening) on the ventral side, hyaline part 20 – 33 % of its length; males with 39 – 45 µm long spicules, lateral guiding pieces rod-like, slightly curved ventrally, bifurcated with claw-like distal end, and 6 – 8 irregularly spaced ventromedian supplements with hiatus.	en	Liang, Siwei, Islam, Md Niraul, Du, Xiaofang, Li, Ying bin, Liang, Wenju, Ahmad, Wasim, Zhang, Xiaoke, Mahamood, Mohammad, Alhewairini, Saleh, Li, Qi (2025): Two new and two known species of the genus Eudorylaimus Andrássy, 1959 (Nematoda, Dorylaimoidea, Qudsianematidae) from Northeast China. ZooKeys 1238: 41-74, DOI: 10.3897/zookeys.1238.138550
89FC6489305252749DA4E2347AF20823.taxon	description	Description. Female. Slender nematodes of medium-sized, 1.0 – 1.3 mm long body; curved ventrally or open C-shaped upon fixation. Body cylindrical, tapering gradually towards both extremities but more so towards the posterior region. Cuticle with two distinct layers, 1.5 – 2.0 μm thick at the anterior region, 2.5 – 4.0 μm at midbody, and 4.0 – 5.0 μm on tail. Outer cuticle smooth or finely striated, inner layer thin with fine transverse striations. Lateral, dorsal, and ventral body pores indistinct. Lateral chords 13 – 15 μm at midbody, occupying ~ 1 / 3 (28 – 34 %) of the corresponding body diameter. Lip region offset from the body by constriction, 2.2 – 2.6 times as wide as high or ~ 1 / 3 to 2 / 5 (32 – 40 %) of the body diameter at the pharyngeal base. Lips angular, separated. Amphidial fovea cup-shaped, aperture slit-like, 8.0 – 10 μm wide or occupying ~ 1 / 2 to 3 / 5 (50 – 62 %) of lip region diameter. Cheilostom a truncate cone. Odontostyle typical dorylaimid in shape, 6.0 – 7.4 times as long as wide, 1.1 – 1.2 times the lip region diameter long or 1.3 – 1.7 % of total body length, its aperture 7.0 – 7.5 μm or ~ 2 / 5 (37 – 40 %) of its length. Odontophore linear, rod-like, 1.3 – 1.5 times the odontostyle length. Guiding ring simple, at 0.5 – 0.6 times lip region diameter from anterior end. Pharynx consisting of a weakly muscular anterior part, expanding gradually into a cylindroid basal part, occupying ~ 41 – 47 % of total neck length; expanded part of the pharynx 5.1 – 6.6 times as long as wide, 2.8 – 3.8 times body diameter at neck base. Pharyngeal gland nuclei and their orifices are located as follows: DO = 57 – 61, DN = 59 – 65, DO – DN = 2.3 – 4.2, S 1 N 1 = 71 – 76, S 1 N 2 = 77 – 81, S 2 N = 87 – 89, S 2 O = 88 – 91. Nerve ring encircling the pharynx at 34 – 39 % of neck length from the anterior end. Cardia rounded to conoid, ~ 2 / 5 to 3 / 5 (42 – 58 %) of the corresponding body diameter long, its junction with pharyngeal base apparently surrounded by cardiac disc. Genital system didelphic-amphidelphic; both the genital branches almost equally developed. Anterior genital branch 14.3 – 26.8 % and the posterior genital branch 15.3 – 26.3 % of body length. Ovaries reflexed, not reaching the oviduct-uterus junction; measuring 76 – 105 μm or 1.7 – 2.5 (anterior) and 82 – 110 μm or 1.5 – 2.2 (posterior) times the corresponding body diameter long; oocytes arranged in a single row except near the distal end. Oviduct joining the ovaries sub-terminally, measuring 82 – 110 μm or 1.5 – 2.2 (anterior) and 57 – 98 μm or 1.0 – 2.3 (posterior) times the corresponding body diameter long; consisting of a slender distal portion and a well-developed pars dilatata. Oviduct-uterus junction marked by the well-developed sphincter. Uterus well-differentiated, tripartite, the proximal part short and well-developed muscular, the median part also short, wider than the proximal part, the distal part comparatively long, somewhat spheroid, measuring 63 – 170 μm or 1.4 – 3.8 (anterior) and 65 – 124 μm or 1.3 – 2.8 (posterior) times the corresponding body diameter long. Vagina extending inwards, 17 – 22 μm or ~ 2 / 5 to 1 / 2 (38 – 46 %) midbody diameter; pars proximalis 12 – 15 × 8.0 – 11 μm, with somewhat sigmoid wall encircled by circular muscles; pars refringens with two small triangular-shaped sclerotized pieces, measuring 5 – 6 × 3 – 4 μm and the combined width 7.5 – 9 μm; pars distalis 2.0 – 3.0 μm. Vulva a transverse slit. Sperm cells present (n = 4). Prerectum 1.1 – 3.0 and rectum 1.0 – 1.3 times the anal body diameter long, a distinct blind sac extending posteriorly to the prerectum-rectum junction (Fig. 6 D, E). Tail short, dorsally convex, conoid, almost straight or distal part slightly bent ventrally with a rounded to sub-clavate terminus, 1.3 – 1.6 times anal body diameter long; with characteristic series of thickening (blisters) on the ventral side of tail (Fig. 6 C – E, G); hyaline portion of tail perceptible, ~ 1 / 5 to 1 / 3 of total tail length with a pair of caudal pores on dorsal side. Male. General morphology similar to that of the female except for the posterior region being more ventrally curved. Genital system diorchic, testes opposed, sperm cells spindle-shaped, 6.0 – 8.0 μm long. In addition to the adcloacal pair, situated at 7 – 8 µm from the cloacal aperture, there are six to eight irregularly spaced ventromedian supplements, the first ventromedian supplement located outside the range of spicules, 35 – 51 μm from the adcloacal pair. Spicules typically dorylaimoid, curved ventrad, relatively robust, 4.3 – 5.0 times as long as wide and 1.2 – 1.5 times as long as body diameter at the level of cloacal aperture, dorsal contour regularly convex, ventral contour bearing a moderately developed hump, curvature of 120 – 127 °. Head occupying 16 – 21 % of total spicules length, its dorsal side longer than ventral side, both sides slightly curved. Median pieces 9.6 – 10 times as long as wide or occupying ~ 33 – 38 % of the spicules’ maximum width, reaching the spicule tip, posterior end 3 – 4 μm wide. Lateral guiding pieces distinct, rod-like, slightly curved ventrally, bifurcated with claw-like distal end, ~ 4.8 – 6.0 times as long as wide or ~ 1 / 3 (30 – 33 %) of the spicules’ length. Prerectum 1.9 – 4.4 and rectum 1.3 – 1.5 times the cloacal body diameter long. Tail short, dorsally convex, conoid, almost straight or distal part slightly bent ventrally with a rounded to sub-clavate terminus, 1.3 – 1.5 times anal body diameter long; with characteristic series of thickening (blisters) on ventral side; hyaline portion of tail perceptible, ~ 1 / 3 of total tail length long with a pair of caudal pores on dorsal side.	en	Liang, Siwei, Islam, Md Niraul, Du, Xiaofang, Li, Ying bin, Liang, Wenju, Ahmad, Wasim, Zhang, Xiaoke, Mahamood, Mohammad, Alhewairini, Saleh, Li, Qi (2025): Two new and two known species of the genus Eudorylaimus Andrássy, 1959 (Nematoda, Dorylaimoidea, Qudsianematidae) from Northeast China. ZooKeys 1238: 41-74, DOI: 10.3897/zookeys.1238.138550
89FC6489305252749DA4E2347AF20823.taxon	etymology	Etymology. The new species is named Eudorylaimus blisterocaudatus because of the presence of blisters in the caudal region.	en	Liang, Siwei, Islam, Md Niraul, Du, Xiaofang, Li, Ying bin, Liang, Wenju, Ahmad, Wasim, Zhang, Xiaoke, Mahamood, Mohammad, Alhewairini, Saleh, Li, Qi (2025): Two new and two known species of the genus Eudorylaimus Andrássy, 1959 (Nematoda, Dorylaimoidea, Qudsianematidae) from Northeast China. ZooKeys 1238: 41-74, DOI: 10.3897/zookeys.1238.138550
FFF3A4B9625F5F61B21BC509ECBFE1DA.taxon	description	Fig. 3, Table 2	en	Liang, Siwei, Islam, Md Niraul, Du, Xiaofang, Li, Ying bin, Liang, Wenju, Ahmad, Wasim, Zhang, Xiaoke, Mahamood, Mohammad, Alhewairini, Saleh, Li, Qi (2025): Two new and two known species of the genus Eudorylaimus Andrássy, 1959 (Nematoda, Dorylaimoidea, Qudsianematidae) from Northeast China. ZooKeys 1238: 41-74, DOI: 10.3897/zookeys.1238.138550
FFF3A4B9625F5F61B21BC509ECBFE1DA.taxon	description	Description. Female. Slender nematodes of small-size, 0.88 – 0.93 mm long body; curved ventrally or open C-shaped upon fixation. Body cylindrical, tapering gradually towards both extremities but more so towards the posterior region. Cuticle with two distinct layers, 1.5 – 2.0 μm thick at the anterior region, 2.0 – 3.5 μm at midbody, and 3.0 – 4.0 μm on tail. Outer cuticle smooth or finely striated, inner layer thin with fine transverse striations. Lateral, dorsal and ventral body pores indistinct. Lateral chords 9 – 10 μm wide at midbody, occupying ~ 1 / 3 (27 – 32 %) of the corresponding body diameter. Lip region offset from the body by constriction, 2.0 – 2.3 times as wide as high or ~ 1 / 3 (33 – 37 %) of the body diameter at the pharyngeal base. Lips angular, separated; labial papillae slightly raised from labial contour. Amphidial fovea cup-shaped, aperture slit-like, 5.5 – 6.0 μm wide or occupying ~ 1 / 2 (50 – 54 %) of lip region diameter. Cheilostom a truncate cone. Odontostyle typical dorylaimoid, 5.0 – 6.5 times as long as wide, 1.1 – 1.2 times the lip region diameter long or 1.3 – 1.5 % of total body length, its aperture 5.0 – 6.0 μm or ~ 2 / 5 (38 – 44 %) of its length. Odontophore linear, rod-like, 1.2 – 1.4 times the odontostyle length. Guiding ring simple, at 0.59 – 0.66 times lip region diameter from anterior end. Pharynx consisting of a weakly muscular anterior part, expanding gradually into a cylindroid part, occupying ~ 40 – 43 % of the total neck length; expanded part of pharynx 5.6 – 7.1 times as long as wide, 3.5 – 4.2 times the body diameter at neck base. Pharyngeal gland nuclei and their orifices are located as follows: DO = 60.9 – 64.1, DN = 64.1 – 66.8, DO – DN = 2.4 – 4.1, S 1 N 1 = 76.1 – 78.3, S 1 N 2 = 80.0 – 82.5, S 2 N = 90.0 – 91.7, S 2 O = 91.1 – 92.7. Nerve ring encircling the pharynx at 37 – 40 % of the neck length from the anterior end. Cardia rounded to conoid, ~ 2 / 5 to 1 / 2 (37 – 50 %) of the corresponding body diameter long. Genital system didelphic-amphidelphic; both the genital branches almost equally developed. Anterior genital branch 11.4 – 15.1 % and the posterior genital branch 10.3 – 13.5 % of body length. Ovaries reflexed, not reaching the oviduct-uterus junction; measuring 48 – 87 μm or 1.6 – 1.9 (anterior) and 49 – 65 μm or 1.6 – 1.8 (posterior) times the corresponding body diameter long; oocytes arranged in a single row except near the distal end. Oviduct joining the ovaries sub-terminally, measuring 48 – 65 μm or 1.6 – 1.9 (anterior) and 45 – 82 μm or 1.3 – 1.8 (posterior) times the corresponding body diameter long, consists of a slender distal portion and a well-developed pars dilatata. Oviduct-uterus junction marked by a well-developed sphincter. Uterus long, measuring 48 – 58 μm or 1.3 – 1.8 (anterior) and 40 – 57 μm or 1.2 – 1.8 (posterior) times the corresponding body diameter long, tripartite, consists of a well-developed muscular proximal part, a short slender median part, and a short, somewhat spheroid distal part. Vagina cylindrical, extending inwards, 14 – 16 μm or ~ 2 / 5 to 1 / 2 (43 – 47 %) of midbody diameter; pars proximalis 9.5 – 12 × 7.0 – 9.0 μm, with somewhat sigmoid wall encircled by circular muscles; pars refringens with two small triangular sclerotized pieces, measuring 3 – 4 × 2 – 3 μm with the combined width 5 – 6 μm; pars distalis 1.5 – 2.0 μm. Vulva a transverse slit. Prerectum 1.6 – 2.2 and rectum 0.9 – 1.1 anal body diameter long. Tail short conoid, ventrally arcuate with clavate to rounded tip, 1.3 – 1.5 times anal body diameter long, with characteristic series of thickening (blisters) on ventral side; hyaline portion of tail always perceptible, ~ 1 / 6 to 1 / 3 anal body diameter long with a pair of caudal pores on dorsal side. Male. General morphology similar to that of female except for the posterior region being more ventrally curved. Genital system diorchic, testes opposed, sperm cells spindle-shaped, 4.0 – 5.0 μm long. In addition to the adcloacal pair, situated at 7 µm from the cloacal aperture, there are five irregularly spaced ventromedian supplements, first ventromedian supplement located beyond the range of spicules, 33 μm from the adcloacal pair. Spicules typically dorylaimoid, curved ventrad, relatively robust, 4.9 times as long as wide and 1.6 times as long as body diameter at the level of cloacal aperture, dorsal contour regularly convex, ventral contour bearing a moderately developed hump, curvature of 125 °. Head occupying 15.6 % of total spicule’s length, its dorsal side longer than ventral side, both sides slightly curved. Median piece 8.7 times as long as wide or occupying ~ 46 % of the spicules’ maximum width, reaching the spicule tip, posterior end 2.5 μm wide. Lateral guiding pieces distinct, and rod-like with bifid distal tip, ~ 5.0 times as long as wide or ~ 1 / 3 of the spicules length. Prerectum 3.2 and rectum 1.9 cloacal body diameter long. Tail similar to female, short conoid, ventrally arcuate with clavate to rounded tip, 1.8 times cloacal body diameter long, with characteristic series of thickening (blisters) on ventral side; hyaline portion of tail always perceptible, 1 / 3 anal body diameter long with a pair of caudal pores on dorsal side.	en	Liang, Siwei, Islam, Md Niraul, Du, Xiaofang, Li, Ying bin, Liang, Wenju, Ahmad, Wasim, Zhang, Xiaoke, Mahamood, Mohammad, Alhewairini, Saleh, Li, Qi (2025): Two new and two known species of the genus Eudorylaimus Andrássy, 1959 (Nematoda, Dorylaimoidea, Qudsianematidae) from Northeast China. ZooKeys 1238: 41-74, DOI: 10.3897/zookeys.1238.138550
ECCEC6949A825E97B07443E89A4E260D.taxon	description	Fig. 2, Table 1	en	Liang, Siwei, Islam, Md Niraul, Du, Xiaofang, Li, Ying bin, Liang, Wenju, Ahmad, Wasim, Zhang, Xiaoke, Mahamood, Mohammad, Alhewairini, Saleh, Li, Qi (2025): Two new and two known species of the genus Eudorylaimus Andrássy, 1959 (Nematoda, Dorylaimoidea, Qudsianematidae) from Northeast China. ZooKeys 1238: 41-74, DOI: 10.3897/zookeys.1238.138550
ECCEC6949A825E97B07443E89A4E260D.taxon	description	Description. Female. Slender nematodes of medium-size, 0.9 – 1.1 mm long body; curved ventrally or open C-shaped upon fixation. Body cylindrical, tapering gradually towards both extremities but more so towards the posterior region. Cuticle with two distinct layers, 1.5 – 2.5 μm thick at the anterior region, 2.0 – 3.0 μm at midbody, and 3.0 – 4.0 μm on tail. Outer cuticle smooth or finely striated, inner layer with fine transverse striations. Lateral, dorsal, and ventral body pores indistinct. Lateral chords 10 – 14 μm wide at midbody, occupying ~ 1 / 3 (29 – 37 %) of the corresponding body diameter. Lip region offset from the body by constriction, 2.5 – 2.8 times as wide as high or 1 / 3 to 2 / 5 (36 – 43 %) of the body diameter at the pharyngeal base. Lips smaller, slightly angular and separated; labial papillae raised from labial contour. Amphidial fovea stirrup-shaped, aperture slit-like, 6.0 – 7.5 μm wide or occupying 1 / 2 (46 – 53 %) of lip region diameter. Cheilostom a truncate cone. Odontostyle typical dorylaimoid, 5.2 – 6.0 times as long as wide, 0.82 – 1.1 times the lip region diameter long or 1.0 – 1.5 % of total body length, its aperture 4.5 – 6.0 μm or 1 / 3 to 2 / 5 (33 – 40 %) of its length. Odontophore linear, rod-like, 1.3 – 1.9 times the odontostyle length. Guiding ring simple, at 0.50 – 0.57 times the lip region diameter from anterior end. Pharynx consisting of a weakly muscular anterior part, expanding gradually into a cylindroid part, occupying ~ 38 – 42 % of the total pharyngeal length; expanded part of the pharynx 5.0 – 6.2 times as long as wide, 2.8 – 3.3 times body diameter at neck base. Pharyngeal gland nuclei and their orifices are located as follows: DO = 65.1 – 67.1, DN = 69.5 – 71.5, DO – DN = 3.6 – 5.7, S 1 N 1 = 77.2 – 79.6, S 1 N 2 = 81.0 – 83.9, S 2 N = 90.8 – 92.8, S 2 O = 91 – 93. Nerve ring encircling the pharynx at 38 – 42 % of the neck length from the anterior end. Cardia rounded to conoid, ~ 1 / 2 (44 – 58 %) of the corresponding body diameter long, with a well-developed cardiac disc. Genital system didelphic – amphidelphic; both the genital branches almost equally developed. Anterior genital branch 7.6 – 13.6 % and the posterior genital branch 9.2 – 12.3 % of the body length. Ovary reflexed, not reaching the oviduct-uterus junction; measuring 45 – 68 μm or 1.0 – 2.0 (anterior) and 49 – 79 μm or 1.1 – 2.0 (posterior) times the corresponding body diameter long; oocytes arranged in a single row except near the tip. Oviduct joining the ovary sub-terminally, measuring 43 – 60 μm or 1.1 – 1.7 (anterior) and 42 – 66 μm or 1.2 – 1.6 (posterior) times the corresponding body diameter long; consisting of a slender distal portion and a well-developed pars dilatata. Oviduct-uterus junction marked by a well-developed sphincter. Uterus short, tubular, measuring 31 – 53 μm or 0.72 – 1.3 (anterior) and 33 – 48 μm or 0.88 – 1.2 (posterior) times the corresponding body diameter long, bipartite, a well-developed muscular proximal part, and a short, slender distal part. Vagina extending inwards, 14 – 18 μm or ~ 2 / 5 to 1 / 2 (39 – 45 %) midbody diameter; pars proximalis 8 – 11 × 8.0 – 10.5 μm, with somewhat sigmoid wall encircled by circular muscles; pars refringens with two small trapezoid-shaped sclerotized pieces, measuring 5 – 7 × 2 – 3 μm and the combined width 7 – 9 μm; pars distalis 1.5 – 2.0 μm. Vulva a transverse slit. Sperm cells absent. Prerectum 1.2 – 2.4 and rectum 1.0 – 1.3 times the anal body diameter long. Tail long, conoid, ventrally arcuate with rounded to subacute tip, 1.8 – 2.3 times anal body diameter long; hyaline part of tail always perceptible, ~ 1 / 5 to 1 / 3 anal body diameter long with a pair of caudal (Fig. 2 L) pores on dorsal side. Male. Not found.	en	Liang, Siwei, Islam, Md Niraul, Du, Xiaofang, Li, Ying bin, Liang, Wenju, Ahmad, Wasim, Zhang, Xiaoke, Mahamood, Mohammad, Alhewairini, Saleh, Li, Qi (2025): Two new and two known species of the genus Eudorylaimus Andrássy, 1959 (Nematoda, Dorylaimoidea, Qudsianematidae) from Northeast China. ZooKeys 1238: 41-74, DOI: 10.3897/zookeys.1238.138550
C35C57A4B9F1522AAB4204050FE75405.taxon	description	Figs 7, 8, 9, 10, Tables 5, 6	en	Liang, Siwei, Islam, Md Niraul, Du, Xiaofang, Li, Ying bin, Liang, Wenju, Ahmad, Wasim, Zhang, Xiaoke, Mahamood, Mohammad, Alhewairini, Saleh, Li, Qi (2025): Two new and two known species of the genus Eudorylaimus Andrássy, 1959 (Nematoda, Dorylaimoidea, Qudsianematidae) from Northeast China. ZooKeys 1238: 41-74, DOI: 10.3897/zookeys.1238.138550
C35C57A4B9F1522AAB4204050FE75405.taxon	diagnosis	Diagnosis. Eudorylaimus saccatus sp. nov. is characterized by its 1.1 – 1.4 mm long slender body; lip region offset by constriction, 15 – 17.5 μm broad; odontostyle 17.5 – 18.5 μm with an aperture ~ 37 – 45 % of its length, odontophore 24.5 – 27.5 μm, 1.3 – 1.5 times the odontostyle length, total stylet length 42 – 45.5 μm; pharynx 332 – 389 μm long, pharyngeal expansion 148 – 189 μm or ~ 44 – 48 % of the total neck length; cardia long 23 – 37 μm or 0.48 – 0.67 times corresponding diameter long; female genital system didelphic-amphidelphic, uterus long, well-differentiated; tail short (35 – 49 μm, c = 24 – 39, c’ = 1.0 – 1.6), dorsally convex, conoid, with rounded to sub-acute terminus, hyaline part 21 – 31 % of its length; males with 44 – 48 µm long spicules, lateral guiding pieces distinct, rod-like, slightly curved ventrally, bifurcated with claw-like distal end and 9 – 11 irregularly spaced ventromedian supplements with hiatus.	en	Liang, Siwei, Islam, Md Niraul, Du, Xiaofang, Li, Ying bin, Liang, Wenju, Ahmad, Wasim, Zhang, Xiaoke, Mahamood, Mohammad, Alhewairini, Saleh, Li, Qi (2025): Two new and two known species of the genus Eudorylaimus Andrássy, 1959 (Nematoda, Dorylaimoidea, Qudsianematidae) from Northeast China. ZooKeys 1238: 41-74, DOI: 10.3897/zookeys.1238.138550
C35C57A4B9F1522AAB4204050FE75405.taxon	description	Description. Female. Slender nematodes of small-size, 1.1 – 1.4 mm long body; curved ventrally or open C-shaped upon fixation. Body cylindrical, tapering gradually towards both extremities but more so towards the posterior region. Cuticle with two distinct layers, 1.5 – 2.0 μm thick at the anterior region, 3.0 – 4.0 μm at midbody, and 5.0 – 6.0 μm on tail. Outer cuticle smooth, inner layer thin with distinctly fine transverse striations. Lateral, dorsal and ventral body pores indistinct. Lateral chords 11 – 14 μm wide at midbody, occupying ~ 1 / 5 (20 – 22 %) of the corresponding body diameter. Lip region offset from the body by constriction, 2.4 – 2.5 times as wide as high or ~ 1 / 3 (27 – 35 %) of the body diameter at the neck base. Lips angular, separated. Amphidial fovea funnel-shaped, aperture slit-like, 8.0 – 8.5 μm wide or occupying ~ 1 / 2 (50 – 53 %) of lip region diameter. Cheilostom a truncate cone. Odontostyle typical dorylaimoid, 5.8 – 6.1 times as long as wide, 1.1 – 1.2 times the lip region diameter long or 1.2 – 1.5 % of total body length, its aperture 7.0 – 8.5 μm or ~ 2 / 5 to 1 / 2 (38 – 47 %) of its length. Odontophore linear, rod-like, 1.3 – 1.5 times the odontostyle length. Guiding ring simple, at 0.56 – 0.62 times lip region diameter from the anterior end. Pharynx consisting of a weakly muscular anterior part, expanding gradually into a cylindroid part, occupying ~ 44 – 48 % of the total neck length, expanded part of the pharynx 5.7 – 6.7 times as long as wide, 3.2 – 3.7 times body diameter at neck base. Pharyngeal gland nuclei and their orifices are located as follows: DO = 56.2 – 58.4, DN = 60.3 – 63.4, DO – DN = 3.1 – 4.9, S 1 N 1 = 74.2 – 77.8, S 1 N 2 = 80.8 – 83.8, S 2 N = 89.4 – 90.9, S 2 O = 90.3 – 92.2. Nerve ring encircling the pharynx at 36 – 38 % of pharyngeal length from the anterior end. Cardia long, rounded to conoid, 1.5 – to 2.2 times as long as wide or ~ 1 / 2 to 2 / 3 (52 – 67 %) of the corresponding body diameter long, its junction with pharyngeal base apparently surrounded by cardiac disc (Fig. 8 H, I). Genital system didelphic – amphidelphic; both the genital branches almost equally developed. Anterior genital branch 15.8 – 20.6 % and the posterior branch 14.6 – 17.3 % of body length. Ovaries reflexed, not reaching the oviduct-uterus junction; measuring 75 – 170 μm or 1.5 – 2.6 (anterior) and 85 – 107 μm or 1.3 – 1.7 (posterior) times the corresponding body diameter long; oocytes arranged in a single row except near the distal end. Oviduct joining the ovaries sub-terminally, measuring 86 – 190 μm or 1.7 – 3.0 (anterior, with one uterine egg inside, egg ovoid, 75 × 36 μm, 2.0 times as long as wide) and 75 – 136 μm or 1.5 – 2.1 (posterior) times the corresponding body diameter long; consisting of a slender distal portion and a well-developed pars dilatata. Oviduct-uterus junction marked by a well-developed sphincter. Uterus well-differentiated, tripartite, the proximal part well-developed muscular, the median short, comparatively less muscular, and the distal part long, tube-like, somewhat spheroid at the end, measuring 96 – 133 μm or 2.0 – 2.1 (anterior,) and 85 – 107 μm or 1.3 – 1.7 (posterior) times the corresponding body diameter long; Vagina extending inwards, 23 – 27 μm or ~ 2 / 5 to 1 / 2 (38 – 47 %) midbody diameter; pars proximalis 15 – 21 × 11 – 12 μm, with somewhat sigmoid wall encircled by circular muscles; pars refringens with two small trapezoid-shaped sclerotized pieces, measuring 4 – 5 × 4 – 5 μm and the combined width 8.5 – 10 μm; pars distalis 1.5 – 2.0 μm. Vulva a transverse slit. Sperm cells present (n = 3). Prerectum 1.7 – 2.8 and rectum 0.83 – 1.2 times the anal body diameter long, a distinct blind sac extending posteriorly to the prerectum-rectum junction (Fig. 9 G – I). Tail dorsally convex conoid, its distal end straight to slightly bent ventrally with a rounded to sub-acute terminus, 1.3 – 1.6 times anal body diameter long; the hyaline part of the tail always perceptible, ~ 1 / 5 to 1 / 3 anal body diameter long with a pair of caudal pores on dorsal side. Male. General morphology similar to that of female except for the posterior region being more ventrally curved. Genital system diorchic, testes opposed, sperm cells spindle-shaped, 5.0 – 7.5 μm long. In addition to the adcloacal pair, situated at 7 – 8 µm from the cloacal aperture, there are 9 – 11 irregularly spaced ventromedian supplements, the first ventromedian supplement located outside the range of spicules, 44 – 48 μm from the adcloacal pair. Spicules typically dorylaimoid, curved ventrad, relatively robust, 4.0 – 4.6 times as long as wide and 1.2 – 1.5 times as long as body diameter at the level of cloacal aperture, dorsal contour regularly convex, ventral contour bearing a moderately developed hump, curvature of 124 – 130 °. Head occupying 16.6 % of total spicules length, its dorsal side longer than ventral side, both sides slightly curved. Median pieces 10.6 – 12.3 times as long as wide or occupying ~ 27.2 – 35 % of the spicules’ maximum width, reaching the spicules tip, posterior end 3.5 – 4.0 μm wide. Lateral guiding pieces distinct, rod-like, slightly curved ventrally, bifurcated with claw-like distal end, ~ 4.8 – 5.6 times as long as wide or ~ 1 / 4 to 1 / 3 of the spicules’ length. Prerectum 2.6 – 4.4 and rectum 1.0 – 1.5 cloacal body diameter long. Tail dorsally convex, conoid, tapering gradually, its distal end slightly bent ventrally with rounded to sub-acute terminus, 1.0 – 1.3 times cloacal body diameter long, the hyaline part of the tail always perceptible, ~ 1 / 4 to 1 / 3 anal body diameter long with a pair of caudal pores on dorsal side.	en	Liang, Siwei, Islam, Md Niraul, Du, Xiaofang, Li, Ying bin, Liang, Wenju, Ahmad, Wasim, Zhang, Xiaoke, Mahamood, Mohammad, Alhewairini, Saleh, Li, Qi (2025): Two new and two known species of the genus Eudorylaimus Andrássy, 1959 (Nematoda, Dorylaimoidea, Qudsianematidae) from Northeast China. ZooKeys 1238: 41-74, DOI: 10.3897/zookeys.1238.138550
C35C57A4B9F1522AAB4204050FE75405.taxon	etymology	Etymology. The new species is named Eudorylaimus saccatus because of the pre-rectal blind sac.	en	Liang, Siwei, Islam, Md Niraul, Du, Xiaofang, Li, Ying bin, Liang, Wenju, Ahmad, Wasim, Zhang, Xiaoke, Mahamood, Mohammad, Alhewairini, Saleh, Li, Qi (2025): Two new and two known species of the genus Eudorylaimus Andrássy, 1959 (Nematoda, Dorylaimoidea, Qudsianematidae) from Northeast China. ZooKeys 1238: 41-74, DOI: 10.3897/zookeys.1238.138550
