Monographis konkakinhensis, Huynh, 2022

Huynh, Cuong, 2022, Four new species of Monographis Attems, 1907 (Diplopoda, Polyxenida, Polyxenidae) from Vietnam, Zootaxa 5214 (3), pp. 393-420 : 403-406

Monographis konkakinhensis new species

Figures 8–12

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, 14.180556N, 108.291667E, 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.

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.

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 8A & 8B ). 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 8C & 11D ) .

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 9C , 11B ).

Leg chaetotaxy: Holotype with 3 spines on T1 ( Figure 10A ) but only 1 spine apparent in the SEM ( Figure 12C ), the appearance of extra spines on T1 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 10B & 12D ).

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 10C & 12B ).

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.

Etymology: Monographis konkakinhensis is named after Kon Ka Kinh National Park in Gia Lai Province, Vietnam, where this species was collected.

Figures

FIGURE 8. Holotype female Monographis konkakinhensis sp. n.. A. Head capsule with eye patterns—8 ommatidia, trichome sockets in posterior vertex (pv) and the trichobothria; B. The enlarged images of trichome sockets in posterior vertex (pv (L): left, pv (R): right); C. Clypeo-labrum showing its structure, labrum with asetose surface.

FIGURE 9. Holotype female Monographis konkakinhensis sp. n.. A. Antennal articles IV–VIII and four sensory cones (sc); B. and C. The arrangement of sensilla on articles VI and VII, the bacilliform sensilla arranged in triangular shape included three thick (T), fifteen thin (t), a setiform (S) and a conical sensillum (C).

FIGURE 10. Holotype female Monographis konkakinhensis sp. n.. A. The second leg showing its segments and its chaetotaxy, vulva (v); B. Telotarsus and its processes, dotted line indicating setiform (s) shorter than the claw (c); C. Dorsal ornamental trichome sockets showing both sides with 25 sockets a, one b, three c (c1, c2 & c3) and the indentation d on each side.

FIGURE 11. A female Monographis konkakinhensis sp. n.. A. Antennal articles VII and VIII, sensory cones (sc); article VII showing the arrangement of two bacilliform sensilla (Ta and Tp), a setiform (S) and a conical sensillum (C). B. Antennal article VI showing sensilla arranged in a triangular shape (T: thick, t: thin bacilliform sensilla). C. Head capsule showing eye pattern, trichobothria (trichobothrium a, b and c) and the posterior vertex trichome sockets (pv) on right hand side. D. Clypeo-labrum showing the asetose surface of labrum (l), median cleft (mc), anterior setae (sa), lateral labrum (Ll), a row of backward-pointing setae (sb) and posterior setae (Se, showing sockets of missing setae).

FIGURE 12. SEM images of a female Monographis konkakinhensis sp. n.. A. The vulvae (v) in coxae II; B. Telson (Te) showing the ornamental trichome sockets (ots) dorsally, trichome bundle structures with the main caudal barbate trichome sockets (cbts), few barbate trichome sockets (bts) in the centre of the bundle, two bundles of nest trichome sockets (nts) ventrally; C. Leg segments and two spines (pointed arrows) typical Monographis; D. Telotarsus and its processes (a: anterior lateral process, p: posterior lateral process, c: claw, s: anterior setiform process, la; lamella process).