Hyleoglomeris coloratoides, Nguyen & Sierwald & Marek, 2019

Nguyen, Anh D., Sierwald, Petra & Marek, Paul E., 2019, The pill millipedes of Vietnam: a key to genera and descriptions of five new species (Diplopoda: Glomerida: Glomeridae), Raffles Bulletin of Zoology 67, pp. 260-297 : 289-290

Hyleoglomeris coloratoides , new species

( Figs. 36–39 )

Material examined. Holotype: male (IEBR–Myr 658H) Vietnam, Ha Tinh Province, Huong Son District, Cau Treo , secondary forests, elevation of 800 m, 30 May 2004, coll. Nguyen A.D.

Paratypes: 4 females (IEBR–Myr 658P) same data as for holotype .

Etymology. Named after the similarity to its congener, Hyleoglomeris colorata Golovatch et al., 2013 from the neighbouring province, Quang Binh.

Diagnosis. The species is differentiated by the following character combination: Thoracic shield with 10 superficial transverse striae. Telopods with a bilobed chevron-shaped syncoxial lobe. The new species is similar to its congeners, H. colorata , from Quang Binh Province in telopod shape, but differs in syncoxial lobe medially concave (vs roundly sub-trapeziform) and legs of leg-pair 17 with 4 podomeres (vs. 3 podomeres in H. colorata ).

Description. Holotype male (IEBR–Myr 658H). Width of 2 nd tergum 5.3 mm, body length 6.5 mm.

Exoskeleton: Ethanol-preserved specimens light yellow, terga with traces of two paramedian transverse oval spots, and a medioposterior light yellow triangular spot ( Fig. 36 A–D).

Head: Ocelli 6+1, lenses convex, black contrasting against yellow background of head. Tömösváry organs transverse oval, 2.0× wider than long. Antenna clavate. Antennomere 6 large, about 2.5× longer than wide. Antennal tip with four large, apical sensory cones. Tergites: Collum semicircular, with faint middle transverse oval spot, with two transverse striae. Second tergum with a narrow hyposchism, not reaching caudal margin, with 10 superficial transverse striae. Anal shield rounded, not concave medially. Legs: Leg-pair 17 strongly reduced, 4-segmented, coxa with a regular outer lobe. Leg-pair 17 ( Figs. 37A , 38A ) in males with a setiferous tubercle distomesally on each side of the syncoxite, with large syncoxial lobe, podomere 1 with small distomesal setiferous knob. Leg-pair 18 less reduced ( Figs. 37B , 38B ), legs similar to leg pair 17, but podomere 3 strongly reduced, very short, and syncoxial lobe small.

Telopods ( Figs. 37C, D , 38C, D , 39 ) with a bilobed chevron-shaped syncoxial lobe, sparsely setose, two horns paramedially ( Fig. 39D ), each directed ventrad, longer than syncoxial lobe. Prefemur and femur with trichosteles. Femur with a straight, large, triangular, distal process. Tibia with stout, broadened process (tp) near base ( Figs. 37C , 38D ). Tarsus S-shaped, acuminate apically ( Fig. 39A ).

Variation. Width of tergum 2 ca. 5.5–6.3 mm (female); length ca. 8.5–11.3 mm (female). Holotype ca. 6.5 mm long, width ca. 5.3 mm at tergum 2.

Figures

Fig. 36. Hyleoglomeris coloratoides new species, holotype (IEBR-Myr 658H) from Huong Son District, Ha Tinh Prov. A, whole body, dorsal view; B, ventral view; C, lateral view; D, antenna, ventral view. Scale bar = 1 mm.

Fig. 37. Hyleoglomeris coloratoides new species, holotype (IEBR-Myr 658H). A, legs 17, anterior view; B, legs 18, anterior view; C, telopods, anterior view; D, posterior view. Scale bar = 1mm.

Fig. 38. Hyleoglomeris coloratoides new species, holotype (IEBR-Myr 658H). A, legs 17, anterior view; B, legs 18, anterior view; C, telopods, posterior view; D, anterior view. Scale bar = 0.5 mm (A); 0.1 mm (B–D).

Fig. 39. Hyleoglomeris coloratoides new species, holotype (IEBR-Myr 658H). A, left telopod, anterior view; B, prefemorite and femorite, anterior view; C, surface of prefemorite and femorite; D, syncoxial horn. Scale bar = 0.5 mm (A–C); 0.1 mm (D).