taxonID	type	description	language	source
038987F7BC1108689495FAA908B89F3C.taxon	type_taxon	Type species: Monographis kraepelini Attems, 1907, by monotypy.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1108689495FAA908B89F3C.taxon	description	Monographis Attems, 1907; Nguyen Duy-Jacquemin and Condé, 1967: 43 Species included: The genus Monographis has eleven species and two subspecies have been described:	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1108689495FAA908B89F3C.taxon	synonymic_list	Monographis kraepelini Attems, 1907, from Java, Indonesia; Monographis annandalei (Silvestri, 1948) from India; Monographis mira (Turk, 1947) from India; Monographis tamoyoensis Condé and Nguyen Duy-Jacquemin, 1963, from Brazil; Monographis kraepelini malayanus Nguyen Duy-Jacquemin and Condé, 1966, from Malaysia; Monographis kraepelini sabahnus Condé and Nguyen Duy-Jacquemin, 1984, from Malaysia; Monographis baihualingensis Ishii and Yin, 2000, from southern China; Monographis yunnanensis Ishii and Yin, 2000, from southern China; Monographis queenslandica Huynh and Veenstra, 2013, from Australia; Monographis demangei Nguyen Duy-Jacquemin and Condé, 1967, from Vietnam; Monographis dongnaiensis Huynh and Veenstra, 2015, from Vietnam; Monographis phuquocensis Huynh and Veenstra, 2018 c, from Vietnam; Monographis condorensis Huynh and Veenstra, 2020, from Vietnam.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1108689495FAA908B89F3C.taxon	diagnosis	Generic diagnosis: Each eye 8 ommatidia. Body with 10 tergites, 9 pleural projections, a caudal bundle present. 13 pairs of legs. 8 antennal articles, VI longest, VIII shortest with 4 sensory cones, all typical characteristics of Polyxenidae. Antennal article VI with 3 – 5 thick bacilliform sensilla among 12 – 24 thin bacilliform sensilla, sensilla located in anterior position longer than posterior ones, arranged into a simple crescent or triangle. A row of backward-pointing minute setae located along posterior margin of labrum. Anterior margin of labrum with acute triangular shape setae or slender setae. Lateral palp of gnathochilarium with 11 conical sensilla and 1.25 times longer than medial palp. Spine on tarsus 1 and 2. Coxal glands on coxae 8 th and 9 th.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1108689495FAA908B89F3C.taxon	description	Colouration: Live Monographis specimens are commonly yellowish brown in colour and darker on the lateroposterior rosette trichomes, which form 2 dark lateral bands contrasting with a light-yellow medial band. Eyes are bright red with two black horizontal bands apparent in the vertex area, which distinguishes the head from the rest of the animal. The last tergite is darkest in colour and extended into the telson region. The caudal bundle trichomes form light silvery bands near the base. The ventral side of the body is white in colour (Figure 2).	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1608669495F9300E319C40.taxon	description	Figures 3 – 7	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1608669495F9300E319C40.taxon	materials_examined	Material examined: Type specimens. Holotype adult male, to be returned to the Zoological Museum of the Moscow University (ZMUM), Moscow, Russia. Paratypes, 2 males and 2 females (ZMUM), all collected from the study of microarthropods and macrofauna in the Nam Cat Tien National Park during 2004 – 2005 (Anchkin et. al., 2007), a south-eastern lowland forest, Dong Nai Province, Vietnam; 11.4475 N, 107.442778 E, elevation 131 m. Specimens were sent to authors by Professor Sergei Golovatch, the collections were preserved in 80 % ethanol, the specimens appeared brownish in colour, and most trichomes and antennae were lost.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1608669495F9300E319C40.taxon	diagnosis	Diagnosis: Body length 2.6 – 3.6 mm. Antennal article VI with 14 – 16 bacilliform sensilla forming crescent shape, setiform sensillum located anterior position, conical sensillum present near centre of crescent. Labrum setose, with long slender anterior setae on anterior margin. Telotarsus with posterior lateral process less than half length of claw, anterior lateral and lamella processes present, anterior setiform process longer than claw.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1608669495F9300E319C40.taxon	description	Description: Holotype male body 2.6 mm; paratypes: males 2.6 – 2.8 mm, females 3.4 – 3.6 mm; caudal bundle in both sexes same length 0.5 mm, nest trichomes in female 0.2 mm. Head: Each side 8 ommatidia: 4 dorsal, 4 lateral (1 anterior, 2 medial and 1 posterior). Vertex with 2 posterior trichome groups (pv) and a large medial gap. Each group with 2 rows: Anterior row curved slightly, on an oblique angle with large trichome sockets in central position, gradually reducing the size at both ends (holotype 12 each side); posterior row with few small sockets (holotype 2 each side); a narrow space between these rows. (Figures 3 A & 3 B). Paratypes showed that variation is common in this species, regardless of sex, ranging from 12 – 16 sockets in anterior rows, 2 – 3 in posterior rows. Trichobothria: typically thin, sensory hairs with narrow cylindrical funicles; trichobothria equal in socket size forming an isosceles triangle with equal distance ab and bc, trichobothrium a located in interior position, trichobothrium b in lateral position, trichobothrium c in exterior position of the head capsule (Figures. 3 A & 3 C). Gnathochilarium: Lateral palp 1.25 times medial palp; 11 conical sensilla on the lateral palp and 22 on the medial palp, same in holotype and paratypes (Figure 3 D). Clypeo-labrum: Holotype, labrum posterior margin with 12 setae (Se), setae equal in length to labrum width; Paratypes, 10 – 12 setae in both sexes. Labrum surface setose (l), labrum posterior margin has a row of minute backward-pointing setae (sb). Lateral lamella (Ll) and single broad lamella each side of median cleft (mc); 7 (Left: L) and 12 (Right: R) slender setae (sa) present on anterior margin of labrum. The number of these anterior slender setae varies among paratypes, ranging from 18 – 20 across both sides. (Figure 3 E). Antennae: Antennal article VI with 15 – 16 bacilliform sensilla. Holotype with 16 bacilliform sensilla forming a crescent shape with 3 thick (T) and 8 thin bacilliform sensilla (t), 5 short thin bacilliform sensilla (ts); setiform sensillum (S) located in anterior position, conical sensillum (C) present near the centre of the crescent (Figures 4 C, 7 B & 7 C). Antennal article VII with 2 thick bacilliform sensilla (T, Ta and Tp), setiform sensillum (S) located in between these two sensilla (T), conical sensillum (C) located next to Tp (Figure 4 B), which is an arrangement typical of the genus. Body. Collum — the first tergite with a pair of pleural projections called lateral protuberances (Lp) (Figure 5 A); tergites 2 (T 2) to 10 (T 10), each connected with a pair of pleural projections (pp) (Figure 5 B); tergite T 10 — the last tergite, trichome sockets dense and smaller (Figure 5 C). Legs. Leg segmentation following Manton (1956) and with articles typical of Polyxenida: legs 1 and 2 without trochanter, leg 1 without tarsus 1. Chaetotaxy (setae on leg articles): coxa 1 and 2: 2 setae, coxae 3 – 13: 2 – 4 setae; pre-femur, post-femur, tibia with 1 seta, except femur with 1 – 4 setae, tarsus 1 and 2 with a spine. Coxa, pre-femur and femur with biarticulated seta and ridged funicle. 1 – 3 smaller biarticulated setae in posterior position of femur, some also on penis. Post-femur and tibia distally with setiform seta. The spine on tarsus 2 is sharply pointed and twice the length of a spine in the antero-sternal position of tarsus 1 (Figures 6 A – C, 7 E, 10 A, 12 C, 15 A, 20 A & 23 C). Telotarsus: Claw slender with anterior lateral (a) and posterior lateral (p) processes less than half length of the claw (c); the anterior setiform process (s) is longer than the claw; lamella process (la) is present (Figures 6 D & 7 F). Sex organs in the male: A pair of penes on coxae 2 and 2 pairs of coxal glands are located on the 8 th – 9 th coxal plates (Figures 6 E & 22 B). Caudal bundles: Similar to congeners (Huynh & Veenstra 2020) and classified as caudal bundle type I arrangement (Condé & Nguyen Duy-Jacquemin, 2008). Caudal trichomes with a series of 2 – 6 backward hooks (Huynh & Veenstra 2013) (Figures 12 B, 23 A & 23 B). Telson: Dorsal ornamental trichome sockets symmetrically arranged either side of telson; 17 (L) and 18 (R) sockets of trichomes a on each side of the telson in the holotype (paratypes with 16 – 18). Trichome a sockets form 2 rows, top row with small sockets, bottom row with larger sockets. Socket of trichome b and 3 large sockets trichomes c with protruding base: c 1, c 2 and c 3, forming triangular shape located in ventroposterior positions in each arrangement. Circular indentation d apparent each side near the exterior side of trichomes c (Figure 6 F).	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1608669495F9300E319C40.taxon	discussion	Remarks: Monographis cattienensis sp. n., differs from other species in the genus in several characters. It has a distinctive number of bacilliform sensilla arranged in a crescent shape, setose labrum surface and slender setae present on lamellae along the anterior margin of the labrum, plus an anterior setiform process longer than the claw.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1608669495F9300E319C40.taxon	etymology	Etymology: Monographis cattienensis is named after the Cat Tien National Park in Dong Nai Province, Vietnam, where this species was collected.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1808619495FE1B0E009ABF.taxon	description	Figures 8 – 12	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1808619495FE1B0E009ABF.taxon	materials_examined	Material examined: Holotype, adult female (IEBR-Myr 987) and a paratype adult female (IEBR-Myr 988) were collected from a hillside near the entrance of Kon ka kinh National Park, 14.180556 N, 108.291667 E, elevation 890 m, by Dr Duc Anh Nguyen, on 24 th May 2017. All types were deposited in the Institute of Ecology and Biological Resources, Vietnam. Kon ka kinh National Park is in the central highlands, 50 km north-east of Pleiku City, Gia Lai Province, Vietnam. Three adult females preserved in 80 % ethanol were sent to authors, two specimens were used for types, and one used for SEM images.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1808619495FE1B0E009ABF.taxon	diagnosis	Diagnosis: Body length 3.8 – 4.5 mm. Antennal article VI with 18 – 19 bacilliform sensilla forming triangular shape, setiform sensillum located in anterior position, conical sensillum present at base of triangle. Labrum asetose, long slender anterior setae in anterior margin. Telotarsus with posterior lateral process equal to half-length of claw, anterior lateral and lamella processes present, anterior setiform process equal half-length of claw.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1808619495FE1B0E009ABF.taxon	description	Description: Holotype female body 4.5 mm; paratype: female 4.3 mm; caudal bundle 0.5 mm, nest trichomes 0.2 mm. Head: Arrangement of post vertex trichomes as for Monographis cattienensis with the holotype having 17 sockets (L) and 16 (R) in anterior rows, posterior rows with 3 sockets (L) and 2 sockets (R) (Figures 8 A & 8 B). Paratype showed anterior rows with 13 sockets (L) and 16 sockets (R), posterior rows with 2 sockets (L) and 3 sockets (R). Clypeo-labrum: Holotype, labrum posterior margin with 10 setae (Se), (Paratype with 10 setae) these setae shorter in length than labrum width. Labrum surface asetose (l), labrum posterior margin has a row of minute backward-pointing setae (sb). Lateral lamella (Ll) and single broad lamella each side median cleft (mc), 18 (L) and 16 (R) slender anterior setae (sa) present on anterior margin of labrum (Figures 8 C & 11 D). Antennae: Antennal article VI with 18 – 19 bacilliform sensilla. Holotype with 18 bacilliform sensilla forming a triangular shape with 3 thick (T) and 15 thin bacilliform sensilla (t), setiform sensillum (S) located in anterior position, conical sensillum (C) present at base of triangle (Figures 9 C, 11 B). Leg chaetotaxy: Holotype with 3 spines on T 1 (Figure 10 A) but only 1 spine apparent in the SEM (Figure 12 C), the appearance of extra spines on T 1 occurs in species this genus. Telotarsus: Claw slender, posterior lateral process (p) equal to half-length of claw (c), anterior lateral (a) and lamella processes (la) present, anterior setiform process (s) equal to half-length of claw. (Figures 10 B & 12 D). Telson: Arrangement of dorsal ornamental trichome sockets similar to M. cattienensis with 25 sockets of trichomes a on each side of the telson in the holotype (paratype with 26 sockets). (Figures 10 C & 12 B).	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1808619495FE1B0E009ABF.taxon	discussion	Remarks: Monographis konkakinhensis sp. n. is distinctive with larger body length and the characteristic arrangement of bacilliform sensilla in triangular shape on the article VI, labrum structures, anterior setiform process shorter than the claw.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1808619495FE1B0E009ABF.taxon	etymology	Etymology: Monographis konkakinhensis is named after Kon Ka Kinh National Park in Gia Lai Province, Vietnam, where this species was collected.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1C087C9495FA4F0CB99AA6.taxon	description	Figures 13 – 17	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1C087C9495FA4F0CB99AA6.taxon	materials_examined	Material examined: Holotype, adult male (IEBR-Myr 989) and paratypes: Adult, two males (IEBR-Myr 990) two females (IEBR-Myr 991) and, two subadults with 12 pairs of legs (IEBR-Myr 992) were collected from Tam Dao National Park, 21.458611 N, 105.649444 E, elevation 1017 m, Vinh Phuc Province, northern Vietnam. All types were deposited in the Institute of Ecology and Biological Resources, Vietnam. Specimens were collected by author CH in the field trip organised by Dr Duc Anh Nguyen, on 17 th July 2017.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1C087C9495FA4F0CB99AA6.taxon	diagnosis	Diagnosis: Body length 2.4 – 3.2 mm. Antennal article VI with 16 – 18 bacilliform sensilla forming crescent shape, setiform sensillum located in anterior position, conical sensillum present near centre of crescent. Labrum asetose, long slender anterior setae in anterior margin. Telotarsus with posterior lateral process shorter than half-length of claw, anterior lateral and lamella processes present, anterior setiform process shorter than half-length of claw.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1C087C9495FA4F0CB99AA6.taxon	description	Description: Holotype male body 2.4 mm; paratypes: males 2.2 – 2.4 mm, females 3.0 – 3.2 mm; caudal bundle 0.5 mm, nest trichomes 0.2 mm. Head: Arrangement of post vertex trichomes as for Monographis cattienensis with the holotype having 13 sockets (L) and 14 (R) in anterior rows, posterior rows with 3 sockets on both sides (Figures 13 A & 13 B). Paratype showed anterior rows with 12 – 14 sockets, posterior rows with 2 – 3 sockets (Figure 16 A). Clypeo-labrum: Holotype, labrum posterior margin with 8 setae (Se), these setae longer in length than labrum width (paratype with 8 – 10 setae). Labrum surface asetose (l), labrum posterior margin has a row of minute backward-pointing setae (sb). Lateral lamella (Ll) and single broad lamella each side median cleft (mc), 12 – 14 slender setae (sa) present on anterior margin of labrum (Figures 13 C & 16 D). Antennae: Antennal article VI with 16 – 18 bacilliform sensilla. Holotype with 16 bacilliform sensilla forming a crescent shape with 3 thick (T), 9 thin bacilliform sensilla (t) and 4 medium-length thin bacilliform sensilla (tm), setiform sensillum (S) located in anterior position, conical sensillum (C) present near centre of crescent (Figures 14 C, 17 B & 17 C). Telotarsus: Claw slender, posterior lateral process (p) shorter than half-length of claw, anterior lateral (a) and lamella processes (la) present, anterior setiform process (s) less than half-length of claw (c). (Figures 15 B & 17 D). Telson: Arrangement of dorsal ornamental trichome sockets similar to M. cattienensis with 17 sockets of trichomes a left side and 18 sockets on right side of the telson in the holotype (paratype with 16 – 18 sockets). (Figure 15 C).	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1C087C9495FA4F0CB99AA6.taxon	discussion	Remarks: Monographis tamdaoensis sp. n. is distinguished from congeners in its labrum structures and anterior setiform process equal to half-length of claw.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC1C087C9495FA4F0CB99AA6.taxon	etymology	Etymology: Monographis tamdaoensis is named after Tam Dao National Park in Vinh Phuc Province, Vietnam.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC0008789495FA840F359ACA.taxon	description	Figures 2, 18 – 23	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC0008789495FA840F359ACA.taxon	materials_examined	Material examined: Holotype, adult male (IEBR-Myr 993) and paratypes: Adult, two males (IEBR-Myr 994) two females (IEBR-Myr 995) and subadults, three females with 12 pairs of legs (IEBR-Myr 996) were collected from Cam Mountain, 10.496944 N, 104.981389 E; elevation 662 m, in the Seven Mountain Ranges (That Son), located in Tri Ton and Tinh Bien districts, An Giang Province, Vietnam. All types were deposited in the Institute of Ecology and Biological Resources, Vietnam. Specimens were collected by author CH on 8 th July 2017.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC0008789495FA840F359ACA.taxon	diagnosis	Diagnosis: Body length 2.0 – 3.0 mm. Antennal article VI with 15 – 16 bacilliform sensilla forming crescent shape, setiform sensillum located in anterior position, conical sensillum present near centre of crescent. Labrum asetose, long slender anterior setae on anterior margin. Telotarsus with anterior and posterior lateral processes equal in length and shorter than half-length of claw, lamella processes present, anterior setiform process longer than claw.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC0008789495FA840F359ACA.taxon	description	Description: Holotype male body 2.0 mm; paratypes: males 2.0 – 2.2 mm, females 2.4 – 3.0 mm; caudal bundle 0.5 mm, nest trichomes 0.2 mm. Head: Arrangement of post vertex trichomes as for Monographis cattienensis with the holotype having 12 sockets on both sides in anterior rows, posterior rows with 4 sockets (L) and 3 sockets (R) (Figures 18 A & 18 B, 22 A). Paratype showed anterior rows with 12 – 16 sockets, posterior rows with 3 – 4, these setae shorter in length than labrum width (Paratype with 8 – 10 setae). Clypeo-labrum: Holotype, labrum surface asetose (l), labrum posterior margin has a row of minute backward-pointing setae (sb). Lateral lamella (Ll) and single broad lamella each side median cleft (mc), 12 (L) and 8 (R) slender setae (sa) present on anterior margin of labrum (Figures 18 C & 22 C & 22 D). Antennae: Antennal article VI with 15 – 16 bacilliform sensilla. Holotype with 15 bacilliform sensilla forming a crescent shape with 3 thick (T), 3 thin bacilliform sensilla (t), 3 medium-length thin bacilliform sensilla (tm), and 6 short thin bacilliform sensilla (ts), setiform sensillum (S) located in anterior position, conical sensillum (C) present near centre of crescent (Figures 19 C, 21 B & 21 D). Telotarsus: Claw slender, anterior (a) and posterior lateral (p) processes equal in length and shorter than halflength of claw (c), lamella processes (la) present, anterior setiform process (s) longer than claw (Figures 20 B & 23 D). Telson: Arrangement of dorsal ornamental trichome sockets similar to M. cattienensis with 14 trichome sockets a left side and 15 sockets on right side of the telson in the holotype (paratype with 14 – 18 sockets). (Figures 20 C, 23 A & 23 B).	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC0008789495FA840F359ACA.taxon	discussion	Remarks: Monographis thatsonensis sp. n. showed a distinctive pattern of sensilla on antennal article VI, labrum structures, anterior and posterior lateral processes equal in length and shorter than half-length of claw, anterior setiform process longer than claw.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
038987F7BC0008789495FA840F359ACA.taxon	etymology	Etymology: Monographis thatsonensis is named after the Seven Mountain Ranges, derived from Sino-Vietnamese, meaning: That Son, in An Giang Province, Vietnam.	en	Huynh, Cuong (2022): Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam. Zootaxa 5214 (3): 393-420, DOI: https://doi.org/10.11646/zootaxa.5214.3.4
