Nepalmatoiulus lanpingensis, 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 : 102-105

Nepalmatoiulus lanpingensis , new species

Figs 1–11

Material examined. Holotype: male ( ZMUM), China, Yunnan Province, NE Lanping City, 0.95 km NNE Xuebangshan , 26°29´14´´ N, 99°30´8´´ E, H = 4035 m, 29 May 2015, leg. I. Belousov, I. Kabak, G. Davidian. Paratypes: 1 male, 2 females ( ZMUM), same locality as in holotype, 29 May 2015, leg. I. Belousov, I. Kabak, G. Davidian.

Diagnosis. Differs from congeners mainly by the presence of the subapical digitiform outgrowth of the posterior gonopod mesomeral process and the absence of the velar process coupled with the moderately stout, parallel margined, apically obliquely rounded anterior gonopod (see Discussion below).

Description. Male. Length 28–32 mm, midbody vertical diameter 2.0– 2.5 mm, with 51(–1), 49(–1) segments, excluding telson. Coloration (in alcohol) black-brown with lighter hind margin of metazona. Venter (including basal parts of legs) brown. Anterior portion of head marbled brown. Legs and antennae dark brown. Eyes black. Head smooth. 2 epicranial setae, 4 supralabral setae, and 32 labral setae (in a male paratype). Eye patches almost oval, composed of not less than 50 ocelli (in a male paratype). Antennae medium-sized, rather slender and clavate. Length ratios of antennomeres 3–7 as 6.3:6.0:6.0:3.3:1, width ratios as 2.8:3.0:3.8:2.5:1. Antennomeres 5 and 6 with incomplete distodorsal corolla of sensory bacilli. Mandibular stipites with subrectangular smooth lobes. Gnathochilarium: about 20 nonapical stipital setae; lamellae linguales each with not less than 5 setae. Collum laterally with 2–3 lower striae of middle length at posterior margin not reaching to anterior margin, dorsally with short striae at posterior margin only. A transverse row of relatively long setae at hind edge of collum. Body segments circular. Prozona smooth except for ventral part with very indistinct obliquely located striae. Metazona with dense, regular, longitudinal striae reaching hind margin (17–18 striae in an approximate square with sides equal to metazonital length of a dorsal side of a midbody ring). Limbus straight, smooth (of Type 1 in Enghoff 1987). A transverse row of sparse, thin setae at hind edge of metazonites, setae gradually growing denser and longer toward telson. Ozopores small, lying immediately behind suture dividing pro- and metazona. Mid-length caudal dorsal projection of telson, covered with setae and tipped with a small claw-shaped process directed caudad. Preanal ring, anal valves, and subanal scale densely setose. Legs relatively short and slender. Very delicately serrate ventral pads 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 segment not in close contact with the basal segments (“Open hook” type in Enghoff 1987). Leg pair 1 postfemur with slightly scaly-rugose ventral surface; tip ventrally slightly rugosity, coxa with one seta, distal segment laterally with small seta, with low tarsal remnant ( Fig. 1 ). Coxa 2 with one mesapical oral seta, a gland opening positioned in central-apical and axial position ( Figs 3, 7 ) according to Enghoff 1987. Penis short, subtrapezoidal, about 1.3 longer than wide ( Fig. 4 ). Ventral margin of body segment VII with lobes similar to figure 32 in Enghoff 1987. Gonopods slightly protruding.Anterior gonopod flattened, with parallel margins apically relatively obliquely rounded, in posterior view subapically excavated for accommodation of mesomeral process; distal margin (excluding the excavation) papillate, subcentrally with knoblike flattened rudimentary telopodite ( Figs 5, 8–9 ). Flagellum slender, middle length distally covered with cuticular spikes ( Fig. 11 ). Second promere with broken apex in male paratype. Opisthomere with curved, strongly thickened mesomeral process bearing subapical digitiform outgrowth (d); apex of the mesomeral process covered with papillae ( Figs 2 , 10 ). Membranous velum (v) with strongly sloped smooth margin, without a notch near the mesomeral process. Margin of accessory membrane smooth. Long and slender solenomere spinose throughout (posteriorly with particularly long spines). Acicular process of a flagellum-quiding flap arising from posterior margin of solenomeral furrow, poorly seen in the figures.

Female. Length 31–32 mm, midbody vertical diameter about 3.8 mm, with 51(–1), 53(–1) segments, excluding telson. Vulva with operculum higher than bursa, apically with a noticeable diagnostic (for Nepalmatoiulus ) excavation ( Fig. 6 ). Apical hyaline lobes of bursa blunted, not long.

Etymology. The specific epithet refers to the type locality.

Figures

FIGURES 1–8. Nepalmatoiulus lanpingensis sp. nov., male and female paratypes. 1, leg pair 1; 2, opisthomere, mesal view; 3, leg pair 2, front view; 4, penis; 5, promere, sublateral view; 6, vulva, caudal view; 7, coxae 2, front view; 8, distal part of promere; v, velum; d, outgrowth of opisthomere mesomeral process. Scales: 10 μm (Fig. 8), 20 μm (Fig. 1), 100 μm (Figs 2–3, 5–6), 30 μm (Fig. 4), without scale (Fig. 7).

FIGURES 9–11. Nepalmatoiulus lanpingensis sp. nov., male paratype. 9, promere, caudal view; 10, gonopods, mesal view; 11, distal part of flagellum; v, velum; d, outgrowth of opisthomere mesomeral process. Scales in mm.