Hyperglomeris inkhavilayi Likhitrakarn, 2023

Likhitrakarn, Natdanai, Srisonchai, Ruttapon, Siriwut, Warut, Jirapatrasilp, Parin, Jeratthitikul, Ekgachai, Panha, Somsak & Sutcharit, Chirasak, 2023, Review of the pill millipede genus Hyperglomeris Silvestri, 1917 (Diplopoda, Glomerida, Glomeridae) with description of two new species from Laos, ZooKeys 1163, pp. 177-198 : 177

Hyperglomeris inkhavilayi Likhitrakarn sp. nov.

Figs 3C, D , 4 , 5

Material examined.

Holotype: Laos - Khammouane • ♂ (CUMZ-GLO095); Nhommalath District, Ban Phawong , orchard; elev. 190 m a.s.l.; 17°32'24"N, 105°25'18"E; 25 Aug. 2014; R. Srisonchai, C. Sutcharit, K. Inkhavilay leg.; CUMZ ; Paratypes: Laos - Khammouane • 2 ♂♂, 3 ♀♀; same collection data as holotype; OQ661873, OQ661874 .

Name.

To honor Dr. Khamla Inkhavilay, the director of the Center of Excellence in Biodiversity at National University of Laos, Vientiane, Laos, who participated in collecting the type series.

Diagnosis.

Although its color pattern seems to be similar to that of H. simplex Nguyen, Sierwald & Marek, 2019 ( Nguyen et al. 2019), it differs by the coloration of the collum, thoracic and anal shields (mostly pale yellowish to brownish vs. dark brown to blackish), leg-pair 18 (with a simple, subtriangular syncoxital notch (sn) vs. an evident pronounced syncoxital tubercles), coupled with a longer prefemoral trichostele (pt) (more than 2/3 vs. 1/2 of femur).

Description.

Body length of stretched holotype 10.7 mm, width 6.9 mm. Body length of stretched paratypes 9.3 mm (♂), 13.5-15.5 mm (♀), width 5.6 (♂), 5.2-8.5 mm (♀).

Coloration in alcohol faded after eight years of preservation (Fig. 4 ), body mostly yellowish, with contrasting black paramedian spots flanking the midline. Mid-dorsal spots on each of tergites 3-11 usually subtriangular (Fig. 4A, D ), or parallel-sided (Fig. 4E ), with smaller and detached patches at caudal edge of tergite 2 and at anterior edge of tergite 12. Lateral sides of each of tergites 2-11 also with a pair of large, sublateral, yellow to marbled blackish spots beside the triangles, normally not reaching the translucent caudal and lateral edges (Fig. 4A, C-E ). Head and collum pale yellowish to dark brownish with darker color laterally. Antennae black to dark brown, only tip of antennae yellowish. Legs and venter pale yellowish to pale brown (Fig. 4B ).

Labrum sparsely setose (Fig. 4B ). Gnathochilarium with 2+2 palps of subequal length. Ocular fields blackish, 8(7)+1 ommatidia, cornea very convex, translucent. Antennae with four evident apical cones, segment 6 ca. 2.1-2.4 × as long as high (Fig. 4B ). Organ of Tömösváry typical, horseshoe-shaped, oblong-oval, elongate, ca. 1.3-1.5 × as long as broad (Fig. 4B ).

Collum as usual, with two transverse striae. Thoracic shield with a small hyposchism field not projecting caudad to nearly reaching the tergal margin. Striae 5-7, mostly superficial, only lower 2 or 3 lying above schism, one level with schism, remaining 3 or 4 below schism, with 5 or 6 complete, crossing the dorsum. Terga 3 and 4 broadly rounded laterally (Fig. 4C, F ). Following terga in front of anal shield rather clearly concave medially at caudal edge and with 2-4 striae starting above lateral edge. Male anal shield slightly concave medially at caudal edge (Fig. 4D, E ).

Male legs 17 (Fig. 5A, B ) strongly reduced, with a rather large, often irregularly rounded coxal lobe (cxl) and a 4-segmented telopodite.

Male legs 18 (Figs 3C, D , 5C ) simple, rather strongly reduced, without any evident outgrowths; syncoxite membranous, on either side with a broad, subtriangular syncoxital notch (sn) and a 4-segmented telopodite.

Telopods (= male legs 19) (Fig. 5D-F ) with a large, rather roundly subtrapeziform syncoxital lobe (sl) with a small notch medially (Fig. 5E ), flanked by two very long, spiniform, obliquely truncate, setose syncoxital horns (sh), two × as high as syncoxital lobe (Fig. 5D, E ). Telopodite 4-segmented, with a spine apically. Prefemur subquadrangular, with a long, rather stout, distad tapering, slightly curved prefemoral trichostele (pt) carrying a short seta, ca. 2/3 × as long as femur. The latter on caudal face with a prominent, stout, finger-shaped, gently tapering distad, distomesal femoral process (fp) devoid of a trichostele, produced apically to ca. 3/4 tibia. Tibia elongate, gently tapering distad and curved apically basad towards process on femur, with an evident, caudad curved, caudal tibial process (tp). Tarsus smallest, subcylindrical, moderately sigmoid, strongly curved, narrowly rounded apically.

Remarks.

Unfortunately, the claw on the male legs 18 tarsus could not be observed, being broken off in both available male specimens, of which only one leg is available for examining the entire tarsus. Consequently, additional specimens are required to determine tarsal claws.

Figures

Figure 3. Leg 18 A, B Hyperglomeris bicaudata sp. nov., ♂ paratype (CUMZ-GLO 007), left, anterior and posterior views, respectively C, D Hyperglomeris inkhavilayi sp. nov., ♂ paratype, right, anterior, and posterior views, respectively. Scale bars: 1 mm.

Figure 4. Hyperglomeris inkhavilayi sp. nov., habitus in dorsal, ventral, and lateral views A-C ♀ paratype (CUMZ-GLO 095) D male paratype (CUMZ-P 085) E, F ♂ holotype (CUMZ-P 085). Scale bars: 2 mm.

Figure 5. Hyperglomeris inkhavilayi sp. nov. A ♂ paratype (CUMZ-GLO 095) B-F ♂ holotype (CUMZ-P 085) A, B leg 17, anterior views C leg 18, anterior view D, E telopod, posterior and anterior views F tip of syncoxital lobes (not to scale). Scale bars: 1 mm (A-E). Abbreviations: cx coxa, cxl coxal lobe, fe femur, fp femoral process, pf prefemur, pft prefemoral trichostele of telopod, sh syncoxital horn of telopod, sl syncoxital lobe of telopod, sn syncoxite notch, sx syncoxite, ta tarsus, tc tibial cone, ti tibia, tp tibial process.