Nepalmatoiulus tianbaoshanensis, Mikhaljova, 2020

Mikhaljova, Elena V., 2020, New data on the fauna of China, part I: the taxonomy of the millipede family Julidae (Diplopoda), Zootaxa 4729 (1), pp. 47-66 : 56-57

Nepalmatoiulus tianbaoshanensis new species

Figs 38–45

Material examined: Holotype: male ( ZMUM), China, Yunnan Province, Tianbaoshan between Shangrila & Habaxue Shan, NE Xiaozhongdian, 27°36´0´´ N, 99°54´5´´ E, H = 4015 m asl., 20 May 2015, leg. I. Belousov, I. Kabak, G. Davidian. Paratypes: 2 males, 4 females ( ZMUM), same locality as in holotype, 20 May 2015, leg. I. Belousov, I. Kabak, G. Davidian ; 1 male ( ZMUM), China, Yunnan Province, Tianbaoshan between Shangrila & Habaxue Shan, SE Niguge, 27°36´38´´ N, 99°56´13´´ E, H = 4285 m asl., 22 May 2015, leg. I. Belousov, I. Kabak, G. Davidian.

Diagnosis. The species differs from Nepalmatoiulus muli sp. nov. in the brown (dark brown or light brown) coloration, broader gonopods, absence of a subapical branch of the solenomere, strong broader dentiform mesomeral process of opisthomere, sharply curved margin of opisthomere velum, strong more broad anterior gonopods, less obliquely rounded apex of promere, distal position of promere with rudimentary telopodite, distal ring of male leg pair 1 with one seta, near diamond-shaped penis, axial and near apical position of gland opening on male coxa 2, and a longer setiform accessory claw.

Description. Male. Length 27–37 mm, vertical diameter 2.0– 2.9 mm, with 55(–1) –56(–1) rings, excluding telson. Coloration of holotype in alcohol dark brown, with a broad dorsal light longitudinal stripe. Coloration of maleparatype from SE Niguge light brown with dark brown thin lateral strip but without a broad dorsal light longitudinal stripe (it is possible that this male is discolored). Legs and antennae of holotype and all paratypes dark brown, eyes black. Labrum yellow. Gnathochilarium light brown with yellow distal part. Head smooth, with 2 epicranial setae, 6 supralabral setae, not less than 30 labral setae and a group of setae on forehead and on each lateral side below antenna. Eye patches suboval, each composed of not less than 70 ocelli. Antennae medium-sized, rather slender and clavate; length and width ratios of the antennomeres as in majority of Nepalmatoiulus . Gnathochilarium with about 20 nonapical stipital setae. Mandibular stipite with subtriangular rounded smooth lobe; not less than 5 setae on each lamella linguales. Collum at posterior margin with short striae; laterally with several longer lower striae; the lower striae not extending from posterior to anterior margin.A transverse row of sparse setae at hind edge of collum. Body cylindrical. Prozona smooth with indistinct obliquely located striae. Suture between pro- and metazonite distinct. Metazonite gradually growing narrower toward body ventral part. Metazona with dense, regular, longitudinal striae reaching hind margin (15–16 striae in an approximate square with sides equal to metazonital length of a midbody ring dorsal part). A transverse row of thin setae at hind edge of metazonites, setae denser toward telson. Ozopores small, lying behind suture dividing pro- and metazona, in touch with suture only in anterior body part, set off from the suture in the second half of the body. Limbus straight, smooth (of Type 1 in Enghoff 1987). Telson with preanal ring covered with short sparse setae. Anal valves, subanal scale, and caudal process of epiproct densely setose. Epiproct caudal process of middle length, carrying at tip a claw-shaped process curved dorsally. Legs relatively short and slender. Very delicately serrate ventral pads present on postfemur and tibia, starting from legs 2. Claw of all legs at base with a long (longer than claw) setiform accessory claw ventrally but without accessory claw dorsally. Leg pair 1 forming hook, the distal ring not coming into close contact with the basal rings (“open hook” type in Enghoff 1987), postfemur with inflated scaly-rugose ventral surface, coxa and distal ring with one seta, tarsal remnant minute ( Fig. 45 ). Coxa 2 with one mesapical oral seta, gland opening positioned in near apical and axial position ( Fig. 40, 42 ) according to Enghoff (1987). Penis nearly diamond-shaped, about 2 times longer than wide ( Fig. 41 ). Ventral margins of body ring VII with ventrad subrectangular apically rounded lobes. Gonopods slightly protruding. Anterior gonopod flattened, robust, with subparallel margins, apically broadly rounded, subapically excavated for accommodation of mesomeral process, distal margin of the excavation slightly papillate; distal third of the posterior surface with knoblike, flattened, rudimentary telopodite ( Figs 38, 43 ). Flagellum slender, middle length, caudally covered with cuticular conical obtuse denticles in distal part. Basal part of the flagellum covered with cuticular spikes. Opisthomere with strong dentiform mesomeral process apically papillate ( Fig. 39 ). Velum with smooth, relatively sharply curved (with a small notch near the mesomeral process) margin. Margin of accessory membrane partly covered with denticles. Solenomere long, slender, spinose throughout, with basal blade (bb).

Female. Length 27–41 mm, vertical diameter 2.5–4.0 mm, with 52(–2), 54(–2), 53(–1), 59(–1) rings, excluding telson. Small females dark brown, without dorsal light longitudinal spripe. Head with 4 supralabral setae. The anterior ventral edge of ring 3 as low ridge with two tops.

Vulva with operculum and bursa of about equal height; apical excavation indistinct, apical lobes of bursa not long; posterior median plate with about 30 setae arranged irregularly ( Fig. 44 ).

Etymology: The specific epithet refers to the type locality.

Figures

FIGURES 38–45. Nepalmatoiulus tianbaoshanensis sp. nov., male and female paratypes. 38, promere, caudal view; 39, opisthomere, mesal view; 40, leg pair 2, front view; 41, penis, front view; 42, coxa 2, front view; 43, distal part of promere, caudal view; 44, vulva, caudal view; 45, leg pair 1, front view; bb, basal blade of solenomere. Male: Figs 38–43, 45. Scales: 20 μm (Figs 41, 43, 45), 100 μm (Figs 38–40, 42, 44).