taxonID	type	description	language	source
03A587843914582B8D83FD11FC500655.taxon	description	(Figs 1 − 4)	en	Tsalolikhin, S. Ya. (2020): Two new species of free-living nematodes (Nematoda) from Vietnam. Zoosystematica Rossica (Zoosyst. Rossica) 29 (1): 11-16, DOI: 10.31610/zsr/2020.29.1.11, URL: http://dx.doi.org/10.31610/zsr/2020.29.1.11
03A587843914582B8D83FD11FC500655.taxon	materials_examined	Holotype. Female, Vietnam, Tuyn Quang Prov., Na Hang Distr., Tung Vui Commune, pond in forest, 400 m a. s. l., 22 ° 19 ′ 46 ″ N, 105 ° 25 ′ 47 ″ E, 16 June 2019, coll. L. Iogansen. Microscope slide No. A- 9238, ZISP. Paratypes. 9 females, same data as for holotype.	en	Tsalolikhin, S. Ya. (2020): Two new species of free-living nematodes (Nematoda) from Vietnam. Zoosystematica Rossica (Zoosyst. Rossica) 29 (1): 11-16, DOI: 10.31610/zsr/2020.29.1.11, URL: http://dx.doi.org/10.31610/zsr/2020.29.1.11
03A587843914582B8D83FD11FC500655.taxon	description	Description. Females. Morphometric description of the holotype and paratypes is given in Table 1. Cuticle thin, about 1 µm. Space between internal organs with small cristalloid bodies of various sizes. Head not offset from body outline. Labial papillae undetectable. Diameter of amphidial fovea corresponding to 30 % of body width. Ocellus present at about 20 – 26 (23) µm from anterior end. Cheilostome medium-sized, with thin walls. Esophagus muscular, gradually dilating towards its base. Cardium mushroom-shaped. Renette more or less oval, located somewhat below cardium; canal of renette and excretory pore not visible. Reproductive system monodelphic, prodelphic. Oocytes arranged in several rows in germinal zone. Uterus usually containing one or two eggs: 29 – 36 x 14 – 23 µm. Vagina very long, cuticularised, noticeably longer than one vulval body diameter. Paravulval gland present. Rectum longer than anal diameter. Tail slender, filiform. Male not found.	en	Tsalolikhin, S. Ya. (2020): Two new species of free-living nematodes (Nematoda) from Vietnam. Zoosystematica Rossica (Zoosyst. Rossica) 29 (1): 11-16, DOI: 10.31610/zsr/2020.29.1.11, URL: http://dx.doi.org/10.31610/zsr/2020.29.1.11
03A587843914582B8D83FD11FC500655.taxon	diagnosis	Comparision. The new species Monhystera vietnamica sp. nov. most closely resembles M. uncigubernaculum Zeidan, Jacobs et Geraert, 1989, which was described from Africa (Zeidan, Jacobs & Geraert, 1989), and M. rolandi Khan et Tahseen, 2006 from India (Khan & Tahseen, 2005). The main differences of the new species from M. uncigubernaculum are the following: vagina 45 – 52 µm (vs 25 – 37 µm), rectum / anal body diameter 0.9 (vs 0.7), and tail filiform (vs tail with slightly swollen spinneret). The main differences of the new species from M. rolandi are: ocellus present (vs absence of ocellus), cephalic setae 5 µm (vs 3 – 4 µm), and tail filiform (vs tail gradually tapering).	en	Tsalolikhin, S. Ya. (2020): Two new species of free-living nematodes (Nematoda) from Vietnam. Zoosystematica Rossica (Zoosyst. Rossica) 29 (1): 11-16, DOI: 10.31610/zsr/2020.29.1.11, URL: http://dx.doi.org/10.31610/zsr/2020.29.1.11
03A587843914582B8D83FD11FC500655.taxon	etymology	Etymology. This species name is a Latinized toponym.	en	Tsalolikhin, S. Ya. (2020): Two new species of free-living nematodes (Nematoda) from Vietnam. Zoosystematica Rossica (Zoosyst. Rossica) 29 (1): 11-16, DOI: 10.31610/zsr/2020.29.1.11, URL: http://dx.doi.org/10.31610/zsr/2020.29.1.11
03A587843914582E8E3AFD67FD720290.taxon	description	(Figs 5 – 9)	en	Tsalolikhin, S. Ya. (2020): Two new species of free-living nematodes (Nematoda) from Vietnam. Zoosystematica Rossica (Zoosyst. Rossica) 29 (1): 11-16, DOI: 10.31610/zsr/2020.29.1.11, URL: http://dx.doi.org/10.31610/zsr/2020.29.1.11
03A587843914582E8E3AFD67FD720290.taxon	materials_examined	Holotype. Female, Vietnam, Kon Tum Prov., Kon Plong Distr., Kon Chu Rang Nature Reserve, pond in forest, 1077 m a. s. l., 14 ° 35 ′ 22 ″ N, 108 ° 25 ′ 04 ″ E, 10 Oct. 2018, coll. L. Iogansen. Microscope slide No. A- 9195, ZISP. Paratypes. 6 females, same data as for holotype.	en	Tsalolikhin, S. Ya. (2020): Two new species of free-living nematodes (Nematoda) from Vietnam. Zoosystematica Rossica (Zoosyst. Rossica) 29 (1): 11-16, DOI: 10.31610/zsr/2020.29.1.11, URL: http://dx.doi.org/10.31610/zsr/2020.29.1.11
03A587843914582E8E3AFD67FD720290.taxon	description	Description. Females. Morphometric descriptions of the holotype and paratypes are given in Table 2. Cuticle thin, in total about 2 µm thick in middle of body. Outline of head round and not offset. Head with six distinct lips, each with one small papilla. Longer cephalic setae 6 – 8 µm, shorter setae about 4 µm. Width of head 19 µm. Buccal cavity 8 – 10 (9) µm wide and 10 µm long; total depth of stoma (buccal cavity and pockets) 20 – 26 (23) µm; two pockets separated by short isthmus, each pocket with one teeth, distance between tops of teeth 9 µm. Amphid openings at level of bottom of buccal cavity or at level of first pocket; amphid diameter 4 µm, approximately one-sixth part of corresponding body width. Reproductive system didelphic, amphidelphic; ovaries reflexed, oocytes arranged in double rows in germinal zone; only two females with mature eggs in uterus. Depth of vagina corresponding to one-third – half of body width. Tail elongate-conoid, spinneret 1 – 2 µm long; subterminal setae absent. Male not found.	en	Tsalolikhin, S. Ya. (2020): Two new species of free-living nematodes (Nematoda) from Vietnam. Zoosystematica Rossica (Zoosyst. Rossica) 29 (1): 11-16, DOI: 10.31610/zsr/2020.29.1.11, URL: http://dx.doi.org/10.31610/zsr/2020.29.1.11
03A587843914582E8E3AFD67FD720290.taxon	diagnosis	Comparision. The new species Brevitobrilus larae sp. nov. most closely resembles B. orientalis Tsalolikhin, 2013, which was described from Kazakhstan (Tsalolikhin, 2013). The new species differs from B. orientalis by longer body (851 − 1048 µm vs 788 − 871 µm), longer (6 − 8 µm vs 5 − 6 µm) and thinner, not hornlike cephalic setae, in longer tail (111 − 147 µm vs 77 − 82 µm) and absence of subterminal setae.	en	Tsalolikhin, S. Ya. (2020): Two new species of free-living nematodes (Nematoda) from Vietnam. Zoosystematica Rossica (Zoosyst. Rossica) 29 (1): 11-16, DOI: 10.31610/zsr/2020.29.1.11, URL: http://dx.doi.org/10.31610/zsr/2020.29.1.11
03A587843914582E8E3AFD67FD720290.taxon	etymology	Etimology. The species is named after the herpetologist Larissa (Lara) Iogansen, who collected material for me in the jungles of Vietnam.	en	Tsalolikhin, S. Ya. (2020): Two new species of free-living nematodes (Nematoda) from Vietnam. Zoosystematica Rossica (Zoosyst. Rossica) 29 (1): 11-16, DOI: 10.31610/zsr/2020.29.1.11, URL: http://dx.doi.org/10.31610/zsr/2020.29.1.11
