Two new and two known species of the genus Eudorylaimus Andrássy, 1959 (Nematoda, Dorylaimoidea, Qudsianematidae) from Northeast China Author Liang, Siwei Tillage and Cultivation Research Institute, Liaoning Academy of Agricultural Sciences, Shenyang- 110161, China Author Islam, Md Niraul 0000-0001-8520-9775 Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang- 110016, China Author Du, Xiaofang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang- 110016, China Author Li, Ying bin 0000-0002-0207-8667 Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang- 110016, China Author Liang, Wenju Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang- 110016, China Author Ahmad, Wasim 0000-0002-8545-4997 Nematode Biodiversity Research Lab, Department of Zoology, Aligarh Muslim University, Aligarh- 202002, India Author Zhang, Xiaoke Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang- 110016, China Author Mahamood, Mohammad Department of Plant Protection, College of Agriculture and Food, Qasim University, Buraydah, Saudi Arabia Author Alhewairini, Saleh 0000-0003-2770-7412 Department of Plant Protection, College of Agriculture and Food, Qasim University, Buraydah, Saudi Arabia Author Li, Qi 0000-0002-8652-8396 Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang- 110016, China text ZooKeys 2025 2025-05-09 1238 41 74 journal article 309743 10.3897/zookeys.1238.138550 ddc7f26b-20ab-4e6c-af55-9c939b287132 2EEDABD8-1C19-47E4-8163-931B1FFA93B8

Table 6. Some important morphometrics and morphological characters of Eudorylaimus saccatus sp. nov. and its six close species. All measurements are in um (except for ‘ L’ in mm).

Character	Eudorylaimus saccatus sp. nov.	E. productus Andrássy, 1959	E. bombilectus Andrássy, 1962	E. blisterocaudatus sp. nov.	E. opisthohystera Altherr, 1953	E. subdigitalis Tjepkema et al., 1971	E. piecea Wu et al., 2018
n	5 ♀♀ / 5 ♂♂	13 ♀♀ / 1 ♂	? ♀♀ /? ♂♂	7 ♀♀ / 4 ♂♂	? ♀♀ /? ♂♂	15 ♀♀	7 ♀♀
L	1.1–1.4 / 1.1 – 1.4	1.0–1.1 / 1.0 – 1.2	1.3–1.7 / 1.0	1.0–1.3 / 1.0 – 1.1	1.3–1.5 / 1.5	14–1.5	1.0–1.2
a	22 – 24 / 18 – 24	18–22 / 20 – 24	21–25 / 20 – 23	22.0–29.9 / 24.6 – 26.5	22–29 / 33	20.5–27.3	15–21.6
b	3.3 – 3.6 / 3.4 – 3.9	3.5–4.1 / 3.5 – 4.0	4.2–4.4 / 3.6 – 3.8	3.5–3.9 / 3.4 – 3.6	3.2–3.6 / 4.3	3.0–3.8	3.1–3.6
c	24 – 30 / 29 – 39	28–33 / 30 – 34	28–38 / 33 – 37	23.3–34.7 / 28.3 – 33.0	22–29 / 30	26–40	18.7–27.5
c’	1.3 – 1.6 / 1.0 – 1.3	1.1–1.5 / 1.1 – 1.2	1.3–1.5	1.3–1.7 / 1.2 – 1.3	–	–	1.5–1.8
Vulval position (V %)	61.9–63.3	52–54	52–54	59.1–63.2	61–64	56.5 – 60.9	59.5–61.8
Lip region	offset by constriction	almost continuous	offset by depression	offset by constriction	offset by constriction	moderately offset by constriction	offset by constriction
Lips shape	Lips moderately angular, separated	Lips less angular	Lips moderately angular	Lips strongly angular, well-separated	Lips strongly angular, well-separated	Lips moderately angular and separated	Lips strongly angular, well separated
Amphidial aperture	8.0–8.5 / 8.5 – 10	7.0–7.5	–	8.0 – 10 / 8.0 – 9.5	10	8–10	5.0–6.5
Odontostyle length	17.5–18.5 / 17.5–18.5	14–14.5 / 14 – 15	14	18–18.5 / 18–19	19.6 / 18	18.2	20–22
Odontophore length	25–27.5 / 24.5 – 27	19.5–24 / 19.0 – 21.5	–	24 – 26 / 24 – 26	25 / 27	–	22 – 25
Total stylet length	43.5–45.5 / 42 – 45	33.5–38 / 33 – 36.5	–	42 – 44 / 42 – 45	44.6 / 45	–	42 – 47
Neck length	342–389 / 332 – 362	273–320 / 281 – 313	–	301 – 339 / 300 – 332	360–400 / 350	310–370	560–620
Expanded part of pharynx	157–189 / 148 – 165	115–141 / 118 – 136	–	132 – 156 / 129 – 150	–	–	140–156
Ex. part of pharynx (%)	44–48	41–44	38–40	41–47	44 / 47	50	42–55
Cardia length	23–36 / 28 – 37	17.5–22	–	17 – 23 / 20 – 23	25–40	16–33	13–20
Prerectum length	61–84 / 86 – 141	50–69 / 64 – 89	–	37 – 85 / 58 – 128	81	60	72–107
Tail length	46–49 / 35 – 44	33–41 / 34 – 38	–	37 – 49 / 35 – 39	–	–	46–59
Tail shape	Conoid, tip rounded to sub-acute terminus	Conical, tip finely rounded	Conical, tip pointed	Conoid, tip rounded	Conoid, tip rounded	Conoid, digited tip	Conoid, tip rounded
Spicules	44–48	45–50	43–45	39–42	55	–	–
Ventromedian supplements	9–11	7–10	10–12	6–8	12	–	–
Blisters on tail	Absent	Absent	Absent	Present	Absent	Absent	Absent
Pre-rectal blind sac	Present	Present	Present	Present	Absent	Absent	Absent