Hyperglomeris simplex, 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 : 276-278

Hyperglomeris simplex , new species

(Figs. 19–23)

Material examined. Holotype: male ( FMNH INS 3716071 ) Vietnam, Vinh Phuc Province, Phuc Yen Town, Ngoc Thanh Commune, Me Linh Station for Biodiversity , 21.3850°N, 105.7119°E, regenerated forest, 10–16 September 2016, coll. Petra Sierwald et al.

Paratypes: 1 male, 1 female ( FMNH INS 3716070 ) same as for holotype ; 2 females (IEBR–Myr 605) same locality, but on the way to Tam Dao 2, natural forests, 1,100 m, 25 February 2017, leg. Anh D. Nguyen ; 1 female (IEBR–Myr

655) same data as for IEBR–Myr 605, but 2–4 August 2017.

Etymology. Named after the simple tibial knob of the male telopods (feminine adjective).

Diagnosis. The species is differentiated by the following character combination: Terga black with median line of yellow spots longitudinally, and two paramedial marbled transverse oval spots. Femoral trichostele absent, femur with mesoanteriorly oriented lamella. Tibial process a simple knob, tibia with mesoposteriorly oriented lamella. Tarsus hooked distally. The new species differs from H. nigra Golovatch, 2017 , H. depigmentata Golovatch, Geoffroy & VandenSpiegel, 2013 in colouration pattern: body entirely unpigmented in H. depigmentata , and dorsa entirely black in H. nigra vs. terga with two lateral marble yellowish brown

Fig. 19. Hyperglomeris simplex new species from Tam Dao National

Park, habitus. Photo by: Anh D. Nguyen, image not to scale.

spots and a medioposterior, brownish yellow, triangular spot in H. simplex , new species. It can also be distinguished from H. maxima Golovatch, 1983 , H. conspicua Golovatch, 1983 , H. dirupta ( Silvestri, 1917) and H. lamellosa Silvestri, 1917 in telopod conformation. Hyperglomeris maxima and H. dirupta have a very short, tiny, femoral trichostele which is absent in H. simplex , new species, H. conspicua and H. lamellosa . The latter three species are distinguished by the tibial structure: H. simplex has a simple knob whereas H. conspicua has a conspicuous, serrate, long process and a small, setiferous knob; H. lamellosa has two different processes.

Description. Holotype male (FMNH INS 3716071). Width of 2nd tergum 7.0 mm, body length 12 mm. Exoskeleton: Terga blackish brown, shiny and smooth. Each tergum with two lateral light-brown marbled, transverse oval spots, and a medio-posterior, light-brown triangular spot. Caudal and lateral tergal margins light-yellow (Figs. 19 – 21). Head: Ocelli 7+1, lenses convex, black contrasting against brown background of head. Tömösváry organ transverse oval, margins not concave, ca. 1.6× wider than long ( Figs. 20C , 21C ). Antennomere 6 bean-shaped ( Fig. 22A ), not clavate, longer than antennomeres 4+5 combined. Antennal tip with four large apical sensory cones (sc). Tergites: Collum with a large oval marbled spot centrally, brown background, with 5 transverse striae ( Figs. 20D , 21D ). Second tergum with a narrow hyposchism reaching caudal margin, with 13 superficial transverse striae. Anal shield broadly rounded at caudal margin ( Figs. 20C , 21C ).

Legs: Leg-pair 17 strongly reduced in size, with 4 podomeres: coxa with a rounded outer lobe (col), and with a setiferous tubercle distomesally; podomere 1 with a small distomesal setiferous knob. Leg-pair 18 ( Fig. 22C ) almost normal size, with 4 podomeres with a simple syncoxial notch, and pronounced syncoxial tubercles.

Telopods ( Figs. 22D, E , 23 A–D) with a trapeziform, medially notched (arrow), sparsely setose, central syncoxial lobe (syl) with two setose horns (syh) paramedially, each directed mesoventrad. Prefemur ( Fig. 22E ) somewhat broadened basally, carrying a tuberculiform trichostele distomesally (pret); lateroanterior side with dense micropapillae (visible on Fig. 23B ). Femur simple, without trichosteles, with a large, straight, tuberculiform distal process (dfp). Tibia membranous mesally, with a short, stout knob distomesally on anterior side ( Fig. 23A , tp). Tarsus apically acuminate, hooked distally.

Variation. Width of second tergum 7.0– 7.2 mm (males), 9.2 mm (female); body length 12.0– 13.2 mm (males), 14.6 mm (female).

Figures

Fig. 20. Hyperglomeris simplex new species, holotype (FMNH INS 3716071) from Vinh Phuc Prov., northern Vietnam. A, whole body, dorsal view; B, lateral view; C, ventral view; D, head, subventral view. Scale bar = 1 mm.

Fig. 21. Hyperglomeris simplex new species, holotype (FMNH INS 3716071) from Vinh Phuc Prov., northern Vietnam. A, whole body, under UV light, dorsal view; B, lateral view; C, ventral view; D, head, subventral view. Scale bar = 1 mm.

Fig. 22. Hyperglomeris simplex new species, holotype (FMNH INS 3716071) from Vinh Phuc Prov., northern Vietnam. A, antenna; B, leg 17; C, legs 18; D, telopods, anterior view; E, posterior view. Scale bar = 1 mm.

Fig. 23. Hyperglomeris simplex new species, holotype (FMNH INS 3716071) from Vinh Phuc Prov., northern Vietnam. A, telopods, anterior view; B, posterior view; C, syncoxial lobe and horns, anterior view; D, posterior view; E, left telopod, anterior view; F, posterior view. Scale bar = 100 µm.