Nepalmatoiulus deqenensis, Mikhaljova, 2020

Mikhaljova, Elena V., 2020, New data on the fauna of China, part II: the millipede genus Nepalmatoiulus Mauriès, 1983 (Diplopoda, Julidae) in continental China and Taiwan, with descriptions of seven new species, Zootaxa 4852 (1), pp. 101-124 : 110-113

Nepalmatoiulus deqenensis , new species

Figs 37–46

Material examined. Holotype: male ( ZMUM), China, Yunnan Province, Deqen, Weixi, Dewei Line Mt. Range btw Xiaruolisuzuxiang & Yezhizhen, 27°39´1´´ N, 99°10´51´´ E, H = 3950 m, 14 June 2013, leg. I. Belousov, I. Kabak, G. Davidian ; Paratypes: 1 male, 1 subadult male ( ZMUM) , 1 male ( FSCB), same locality as in holotype, 14 June 2013, leg. I. Belousov, I. Kabak, G. Davidian.

Diagnosis. Differs from congeners mainly by the hook-shaped mesomeral process of posterior gonopod with strong subapical mesal knob-like outgrowth and the absence of velar process coupled with a short solenomere.

Description. Male. Length 23–25 mm, midbody vertical diameter about 2.0 mm, with 52 (–1), 45 (–2), 48 (–2) segments, excluding telson. Coloration (in alcohol) marbled brown-gray with broad longitudinal dorsal stripe formed by lighter dorso-anterior metazonital portions; venter (including basal parts of legs) lighter. Distal portions of legs brown, antennae and telson dark brown. Occiput and forehead marbled brown, ventral parts of head light brown. Eyes black. Head smooth, covered with sparse setae. Epicranial setae not visible, 4 supralabral setae, not less than 20 labral setae. Eye patches almost oval, composed of more than 50 ocelli (in a male paratype). Antennae medium-sized, rather slender and clavate. Gnathochilarium with not less than 10 nonapical stipital setae. Mandibular stipite with subtriangular rounded smooth lobe. More than 3 setae on each lamella linguales. Collum laterally with distinct lower striae of middle length at the posterior margin not reaching to anterior margin, dorsally with indistinct shorter striae at the posterior margin only. A transverse row of sparse setae at hind edge of collum. Body segments circular. Prozona smooth except for ventral part with obliquely located striae. The metazonite gradually a little narrower toward the venter. Metazona with dense, regular, longitudinal striae reaching hind margin (12–13 striae in an approximate square with sides equal to metazonital length of a dorsal side of midbody ring). Limbus straight, smooth (of Type 1 in Enghoff 1987). A transverse row of thin setae at hind edge of metazonites, setae gradually growing denser toward telson. Ozopores small, lying immediately behind suture dividing pro- and metazona. Caudal dorsal projection of telson straight and long, setose, tipped with a claw-shaped process curved dorsally. Preanal ring, anal valves, and subanal scale setose. Legs relatively short and slender. Very delicately serrate ventral pads present on postfemur and tibia, starting from legs 2; pads somewhat decreasing in size towards telson. The hind most legs without ventral pads on tibia. 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 segment not touching basal segments (“Open hook” type in Enghoff 1987); postfemur with scaly-rugose ventral surface, tip indistinctly wrinkly; coxa with one seta, distal segment without seta and tarsal remnant ( Fig. 37 ). Coxa 2 with one mesapical oral seta, a gland opening positioned in central and axial position according to Enghoff 1987 ( Figs 38, 41 ). Penis relatively long, slender, about 1.8 longer than wide ( Fig. 43 ). Ventral margin of body segment VII with lobes similar to figure 32 in Enghoff 1987. Gonopods protruding. Anterior gonopod flattened, with parallel margins, apically rounded, in posterior view subapically excavated for accommodation of mesomeral process; distal margins of the excavation papillate. Subcentrally with knoblike flattened rudimentary telopodite ( Figs 39–40 ). Flagellum slender, relatively short, covered with cuticular conical obtuse denticles in the distal part ( Fig. 42 ); basal part of the flagellum caudally covered with cuticular spikes. Opisthomere hook-shaped, smooth mesomeral process subapically with strong mesal knob-like outgrowth (d) ( Figs 44, 46 ). Membranous velum with sloped smooth margin, without a notch near the mesomeral process. Velum smooth. Solenomere short, spinose throughout ( Fig. 45 ). Margin of accessory membrane smooth. Acicular process of a flagellum-quiding flap arising from posterior margin of solenomeral furrow not seen in the figures.

Subadult male. Length and midbody vertical diameter as in holotype, i.e. about 25 mm, with 47 (–2) segments, excluding telson. Leg pair 1 normal (not modificated). Gonopods very slightly protruding, probably undeveloped. The gonopods not dissected.

Female unknown.

Etymology. The specific epithet refers to the type locality.

Figures

FIGURES 37–43. Nepalmatoiulus deqenensis sp. nov., male paratype. 37, leg pair 1; 38, leg pair 2, front view; 39, promere, caudal view; 40, distal part of promere; 41, coxae 2, front view; 42, distal part of flagellum; 43, penis. Scales: 10 μm (Fig. 42), 20 μm (Figs 37, 40), 30 μm (Fig. 43), 100 μm (Figs 38–39, 41).

FIGURES 44–46. Nepalmatoiulus deqenensis sp. nov., male paratype. 44, opisthomere, mesal view; 45, solenomere; 46, apex of mesomeral process; d, outgrowth of opisthomere mesomeral process. Scales: 10 μm (Figs 45–46), 100 μm (Fig. 44).